|
Hello everyone once again,
I changed my facet cube auxiliary electric fuel pump with a bravex auxiliary electric fuel pump. The specifications between the both are merely identical - my current bravex pump has a current draw of 1-2amps with 2-4psi output.
After I installed it yesterday and went flying today, the ammeter inside my cockpit registers current draw of about 5-8amps give or take, but as soon as I switch the auxiliary pump on, the needle bounces back and forth like it's going crazy. No beakers pop/open but I'm confused as to why the ammeter needle is bouncing; it's bounces almost like one would simulate the same phenomenon by shaking the Ammeter, if it were to be disconnected, in your hands, sort of thing.
For starters, I changed the facet pump thinking it was defective when it stopped working, but afterwards re-plumbing new fuel lines with a check valve and after Installing a new pump, I then realized the wire connector was the culprit of the pump stopping - the puno was fine but rather the wire and circuit of the auxiliary fuel pump had 2 sets of cheap plastic push-on connectors that were 15 years old and landing on rough grass field, probably exacerbated the connection to finally malfunctioning, amongst oxidization and humidity, and quality of connector, etc.
Anyway today I went flying with the new bravex fuel pump, soon realizing the brand new bravex fuel pump stop working.
After I landed I was surprised to find out if I got a defective new pump. I then chased the wires and circuit of the auxiliary fuel pump one more, to then realized I noticed yet another cheap push on connect. I moved the last cheap connector that was part of this circuit around, at which point the new bravex fuel pump states to work again.
I will remove this last problematic connection and splice a straight through connection.
Could my ammeter needle be bouncing abruptly because of this (last) poor connection in the auxiliary pump circuit, or could that be a coincidence and the ammeter needle bouncing in the dial be tied towards something else?
If i don't turn on the newly installed pump, the needle doesn't bounce, but rather accurately measures total current in the entire electrical circuit of the plane.
When I turned on the auxiliary pump with the engine off, the needle also did not bounce around like crazy.
When I had the engine running more or less at idle, with the auxiliary pump on, the needle did not bounce around even then.
However, once I applied full throttle and got off the ground with the auxiliary pump on, the needle then started bouncing around back and forth like crazy.
I will be fixing the last connection issue tomorrow, but thought I'd reach out to you all for any advice.
Maybe once I fix the last connection problem within the auxiliary pump circuit, will the ammeter needle stop acting this way?
Any advice is appreciated.
Thank you!
|
I'm far from an expert but it does sound to my befuddled amateur
brain like a wiring issue.
Only thing for it is replace old connectors and possibly also
cables. Soldered joints are always better. I spent yesterday
replacing a temporary chocolate screw connector with a soldered
connection. Its difficult to do neatly in the confines of? the
cockpit.
How often should fuel pumps be replaced. Mine are original from
when my aircraft was built in 2003. Its done around 450 hours. It
has a Pierburg mechanical pump which you cannot get any-more and I
have been advised that an old Piesburg is better than a new
replacement. The electrical pump is also original but working
fine.
Regards
Jon
X air Falcon
On 11/08/2022 02:23, Justin Gregoris
wrote:
toggle quoted message
Show quoted text
Hello everyone once again,
I changed my facet cube auxiliary electric fuel pump with a bravex
auxiliary electric fuel pump. The specifications between the both
are merely identical - my current bravex pump has a current draw
of 1-2amps with 2-4psi output.
After I installed it yesterday and went flying today, the ammeter
inside my cockpit registers current draw of about 5-8amps give or
take, but as soon as I switch the auxiliary pump on, the needle
bounces back and forth like it's going crazy. No beakers pop/open
but I'm confused as to why the ammeter needle is bouncing; it's
bounces almost like one would simulate the same phenomenon by
shaking the Ammeter, if it were to be disconnected, in your hands,
sort of thing.
For starters, I changed the facet pump thinking it was defective
when it stopped working, but afterwards re-plumbing new fuel lines
with a check valve and after Installing a new pump, I then
realized the wire connector was the culprit of the pump stopping -
the puno was fine but rather the wire and circuit of the auxiliary
fuel pump had 2 sets of cheap plastic push-on connectors that were
15 years old and landing on rough grass field, probably
exacerbated the connection to finally malfunctioning, amongst
oxidization and humidity, and quality of connector, etc.
Anyway today I went flying with the new bravex fuel pump, soon
realizing the brand new bravex fuel pump stop working.
After I landed I was surprised to find out if I got a defective
new pump. I then chased the wires and circuit of the auxiliary
fuel pump one more, to then realized I noticed yet another cheap
push on connect. I moved the last cheap connector that was part of
this circuit around, at which point the new bravex fuel pump
states to work again.
I will remove this last problematic connection and splice a
straight through connection.
Could my ammeter needle be bouncing abruptly because of this
(last) poor connection in the auxiliary pump circuit, or could
that be a coincidence and the ammeter needle bouncing in the dial
be tied towards something else?
If i don't turn on the newly installed pump, the needle doesn't
bounce, but rather accurately measures total current in the entire
electrical circuit of the plane.
When I turned on the auxiliary pump with the engine off, the
needle also did not bounce around like crazy.
When I had the engine running more or less at idle, with the
auxiliary pump on, the needle did not bounce around even then.
However, once I applied full throttle and got off the ground with
the auxiliary pump on, the needle then started bouncing around
back and forth like crazy.
I will be fixing the last connection issue tomorrow, but thought
I'd reach out to you all for any advice.
Maybe once I fix the last connection problem within the auxiliary
pump circuit, will the ammeter needle stop acting this way?
Any advice is appreciated.
Thank you!
|
Hello Justin, I was hoping someone else would jump in with more
experience for me but it sounds to me like it is a grounding issue.
When everything is running the ground is jumping all over the place.
It is going to be happening when the fuel pump is going because it
will draw a lot more power than just about anything else you have
installed. Have you also grounded the fuel pump case itself? ???
this is very important, you just can't rely on the red and black
wire going into the pump, the pump itself must be adequately
grounded
Justin Gregoris wrote on 11/08/2022
11:23 am:
Hello everyone once again,
I changed my facet cube auxiliary electric fuel pump with a bravex
auxiliary electric fuel pump. The specifications between the both
are merely identical - my current bravex pump has a current draw
of 1-2amps with 2-4psi output.
After I installed it yesterday and went flying today, the ammeter
inside my cockpit registers current draw of about 5-8amps give or
take, but as soon as I switch the auxiliary pump on, the needle
bounces back and forth like it's going crazy. No beakers pop/open
but I'm confused as to why the ammeter needle is bouncing; it's
bounces almost like one would simulate the same phenomenon by
shaking the Ammeter, if it were to be disconnected, in your hands,
sort of thing.
For starters, I changed the facet pump thinking it was defective
when it stopped working, but afterwards re-plumbing new fuel lines
with a check valve and after Installing a new pump, I then
realized the wire connector was the culprit of the pump stopping -
the puno was fine but rather the wire and circuit of the auxiliary
fuel pump had 2 sets of cheap plastic push-on connectors that were
15 years old and landing on rough grass field, probably
exacerbated the connection to finally malfunctioning, amongst
oxidization and humidity, and quality of connector, etc.
Anyway today I went flying with the new bravex fuel pump, soon
realizing the brand new bravex fuel pump stop working.
After I landed I was surprised to find out if I got a defective
new pump. I then chased the wires and circuit of the auxiliary
fuel pump one more, to then realized I noticed yet another cheap
push on connect. I moved the last cheap connector that was part of
this circuit around, at which point the new bravex fuel pump
states to work again.
I will remove this last problematic connection and splice a
straight through connection.
Could my ammeter needle be bouncing abruptly because of this
(last) poor connection in the auxiliary pump circuit, or could
that be a coincidence and the ammeter needle bouncing in the dial
be tied towards something else?
If i don't turn on the newly installed pump, the needle doesn't
bounce, but rather accurately measures total current in the entire
electrical circuit of the plane.
When I turned on the auxiliary pump with the engine off, the
needle also did not bounce around like crazy.
When I had the engine running more or less at idle, with the
auxiliary pump on, the needle did not bounce around even then.
However, once I applied full throttle and got off the ground with
the auxiliary pump on, the needle then started bouncing around
back and forth like crazy.
I will be fixing the last connection issue tomorrow, but thought
I'd reach out to you all for any advice.
Maybe once I fix the last connection problem within the auxiliary
pump circuit, will the ammeter needle stop acting this way?
Any advice is appreciated.
Thank you!
--
With regards, Michael Coates
AU +61 7 5522 0583
USA +1 213 984 1237
PIPISTREL AIRCRAFT DEALER OF THE YEAR 2012
Winner of the EAA August Raspet Award 2012
PIPISTREL AIRCRAFT DEALER OF THE YEAR 2017
mailto:mcoates@...
skype name: xcomavionics
Please note: because of the volume of e-mail we are now receiving our replies are
done using voice recognition software in an effort to speed up the reply process.
Sometimes the voice recognition program inserts silly words or doesn't actually
do what it is meant to do. Occasionally these mistakes get through our quick
proofreading of each e-mail sent, so please accept my apologies if the odd mistake
gets through.
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"Amateurs practice till they get it right;
Professionals practice till they can’t get it wrong."
|
Actually, soldered connections are prone to failure in environments where vibration is a factor.? That is why in ,ost cases in aircraft crimped connections and stranded wire is the standard.? It maintains a secure but flexible connection.
In addition in corrosive environments the metal insolder can lead to dissililar metal corrosion.
On Thu, Aug 11, 2022 at 2:43 AM Jonathan Webb < avia1or01@...> wrote:
I'm far from an expert but it does sound to my befuddled amateur
brain like a wiring issue.
Only thing for it is replace old connectors and possibly also
cables. Soldered joints are always better. I spent yesterday
replacing a temporary chocolate screw connector with a soldered
connection. Its difficult to do neatly in the confines of? the
cockpit.
How often should fuel pumps be replaced. Mine are original from
when my aircraft was built in 2003. Its done around 450 hours. It
has a Pierburg mechanical pump which you cannot get any-more and I
have been advised that an old Piesburg is better than a new
replacement. The electrical pump is also original but working
fine.
Regards
Jon
X air Falcon
On 11/08/2022 02:23, Justin Gregoris
wrote:
Hello everyone once again,
I changed my facet cube auxiliary electric fuel pump with a bravex
auxiliary electric fuel pump. The specifications between the both
are merely identical - my current bravex pump has a current draw
of 1-2amps with 2-4psi output.
After I installed it yesterday and went flying today, the ammeter
inside my cockpit registers current draw of about 5-8amps give or
take, but as soon as I switch the auxiliary pump on, the needle
bounces back and forth like it's going crazy. No beakers pop/open
but I'm confused as to why the ammeter needle is bouncing; it's
bounces almost like one would simulate the same phenomenon by
shaking the Ammeter, if it were to be disconnected, in your hands,
sort of thing.
For starters, I changed the facet pump thinking it was defective
when it stopped working, but afterwards re-plumbing new fuel lines
with a check valve and after Installing a new pump, I then
realized the wire connector was the culprit of the pump stopping -
the puno was fine but rather the wire and circuit of the auxiliary
fuel pump had 2 sets of cheap plastic push-on connectors that were
15 years old and landing on rough grass field, probably
exacerbated the connection to finally malfunctioning, amongst
oxidization and humidity, and quality of connector, etc.
Anyway today I went flying with the new bravex fuel pump, soon
realizing the brand new bravex fuel pump stop working.
After I landed I was surprised to find out if I got a defective
new pump. I then chased the wires and circuit of the auxiliary
fuel pump one more, to then realized I noticed yet another cheap
push on connect. I moved the last cheap connector that was part of
this circuit around, at which point the new bravex fuel pump
states to work again.
I will remove this last problematic connection and splice a
straight through connection.
Could my ammeter needle be bouncing abruptly because of this
(last) poor connection in the auxiliary pump circuit, or could
that be a coincidence and the ammeter needle bouncing in the dial
be tied towards something else?
If i don't turn on the newly installed pump, the needle doesn't
bounce, but rather accurately measures total current in the entire
electrical circuit of the plane.
When I turned on the auxiliary pump with the engine off, the
needle also did not bounce around like crazy.
When I had the engine running more or less at idle, with the
auxiliary pump on, the needle did not bounce around even then.
However, once I applied full throttle and got off the ground with
the auxiliary pump on, the needle then started bouncing around
back and forth like crazy.
I will be fixing the last connection issue tomorrow, but thought
I'd reach out to you all for any advice.
Maybe once I fix the last connection problem within the auxiliary
pump circuit, will the ammeter needle stop acting this way?
Any advice is appreciated.
Thank you!
|
The fuel pump only draws maximum 2 amps and I am already using stranded wire and I have replaced the plastic remote control type connectors with straight through butt connectors and heat trick and my fuel pump is grounded. I will go flying tomorrow morning
and see if it works better now. Hopefully the loose negative terminal connector was not giving a proper ground, making the needle sounds like crazy. Fingers crossed.
From: XAIR@groups.io <XAIR@groups.io> on behalf of Rol <rol@...>
Sent: Thursday, August 11, 2022 5:51:06 PM
To: XAIR@groups.io <XAIR@groups.io>
Subject: Re: [XAIR] Analog Ammeter needle all of a sudden bounces
?
Actually, soldered connections are prone to failure in environments where vibration is a factor.? That is why in ,ost cases in aircraft crimped connections and stranded wire is the standard.? It maintains a secure but flexible connection.
In addition in corrosive environments the metal insolder can lead to dissililar metal corrosion.
On Thu, Aug 11, 2022 at 2:43 AM Jonathan Webb < avia1or01@...> wrote:
toggle quoted message
Show quoted text
I'm far from an expert but it does sound to my befuddled amateur brain like a wiring issue.
Only thing for it is replace old connectors and possibly also cables. Soldered joints are always better. I spent yesterday replacing a temporary chocolate screw connector with a soldered connection. Its difficult to do neatly in the confines of? the cockpit.
How often should fuel pumps be replaced. Mine are original from when my aircraft was built in 2003. Its done around 450 hours. It has a Pierburg mechanical pump which you cannot get any-more and I have been advised that an old Piesburg is better than a new
replacement. The electrical pump is also original but working fine.
Regards
Jon
X air Falcon
On 11/08/2022 02:23, Justin Gregoris wrote:
Hello everyone once again,
I changed my facet cube auxiliary electric fuel pump with a bravex auxiliary electric fuel pump. The specifications between the both are merely identical - my current bravex pump has a current draw of 1-2amps with 2-4psi output.
After I installed it yesterday and went flying today, the ammeter inside my cockpit registers current draw of about 5-8amps give or take, but as soon as I switch the auxiliary pump on, the needle bounces back and forth like it's going crazy. No beakers pop/open
but I'm confused as to why the ammeter needle is bouncing; it's bounces almost like one would simulate the same phenomenon by shaking the Ammeter, if it were to be disconnected, in your hands, sort of thing.
For starters, I changed the facet pump thinking it was defective when it stopped working, but afterwards re-plumbing new fuel lines with a check valve and after Installing a new pump, I then realized the wire connector was the culprit of the pump stopping -
the puno was fine but rather the wire and circuit of the auxiliary fuel pump had 2 sets of cheap plastic push-on connectors that were 15 years old and landing on rough grass field, probably exacerbated the connection to finally malfunctioning, amongst oxidization
and humidity, and quality of connector, etc.
Anyway today I went flying with the new bravex fuel pump, soon realizing the brand new bravex fuel pump stop working.
After I landed I was surprised to find out if I got a defective new pump. I then chased the wires and circuit of the auxiliary fuel pump one more, to then realized I noticed yet another cheap push on connect. I moved the last cheap connector that was part of
this circuit around, at which point the new bravex fuel pump states to work again.
I will remove this last problematic connection and splice a straight through connection.
Could my ammeter needle be bouncing abruptly because of this (last) poor connection in the auxiliary pump circuit, or could that be a coincidence and the ammeter needle bouncing in the dial be tied towards something else?
If i don't turn on the newly installed pump, the needle doesn't bounce, but rather accurately measures total current in the entire electrical circuit of the plane.
When I turned on the auxiliary pump with the engine off, the needle also did not bounce around like crazy.
When I had the engine running more or less at idle, with the auxiliary pump on, the needle did not bounce around even then.
However, once I applied full throttle and got off the ground with the auxiliary pump on, the needle then started bouncing around back and forth like crazy.
I will be fixing the last connection issue tomorrow, but thought I'd reach out to you all for any advice.
Maybe once I fix the last connection problem within the auxiliary pump circuit, will the ammeter needle stop acting this way?
Any advice is appreciated.
Thank you!
|
after splicing through the multiple broken plastic clip connections, the auxiliary fuel pump works as it should, but the ammeter still bounces around like crazy, once the pump is running and the motor is on high rpm.
when the pump is running, and the engine is on lower rpm or idle, the ammeter needle doesnt bounce around, just bounces around when the rpm's are over 2200rpm.
maybe its the specific make/model of this bravex fuel pump - perhaps the solenoid engineering/design within the pump causes this reaction, although the previous facet usa made fuel pump did not give this reaction/issue.
toggle quoted message
Show quoted text
From: XAIR@groups.io <XAIR@groups.io> on behalf of Justin Gregoris <jgregoris789@...>
Sent: August 11, 2022 8:12 PM
To: XAIR@groups.io <XAIR@groups.io>
Subject: Re: [XAIR] Analog Ammeter needle all of a sudden bounces
?
The fuel pump only draws maximum 2 amps and I am already using stranded wire and I have replaced the plastic remote control type connectors with straight through butt connectors and heat trick and my fuel pump is grounded. I will go flying tomorrow morning
and see if it works better now. Hopefully the loose negative terminal connector was not giving a proper ground, making the needle sounds like crazy. Fingers crossed.
From: XAIR@groups.io <XAIR@groups.io> on behalf of Rol <rol@...>
Sent: Thursday, August 11, 2022 5:51:06 PM
To: XAIR@groups.io <XAIR@groups.io>
Subject: Re: [XAIR] Analog Ammeter needle all of a sudden bounces
?
Actually, soldered connections are prone to failure in environments where vibration is a factor.? That is why in ,ost cases in aircraft crimped connections and stranded wire is the standard.? It maintains a secure but flexible connection.
In addition in corrosive environments the metal insolder can lead to dissililar metal corrosion.
On Thu, Aug 11, 2022 at 2:43 AM Jonathan Webb < avia1or01@...> wrote:
I'm far from an expert but it does sound to my befuddled amateur brain like a wiring issue.
Only thing for it is replace old connectors and possibly also cables. Soldered joints are always better. I spent yesterday replacing a temporary chocolate screw connector with a soldered connection. Its difficult to do neatly in the confines of? the cockpit.
How often should fuel pumps be replaced. Mine are original from when my aircraft was built in 2003. Its done around 450 hours. It has a Pierburg mechanical pump which you cannot get any-more and I have been advised that an old Piesburg is better than a new
replacement. The electrical pump is also original but working fine.
Regards
Jon
X air Falcon
On 11/08/2022 02:23, Justin Gregoris wrote:
Hello everyone once again,
I changed my facet cube auxiliary electric fuel pump with a bravex auxiliary electric fuel pump. The specifications between the both are merely identical - my current bravex pump has a current draw of 1-2amps with 2-4psi output.
After I installed it yesterday and went flying today, the ammeter inside my cockpit registers current draw of about 5-8amps give or take, but as soon as I switch the auxiliary pump on, the needle bounces back and forth like it's going crazy. No beakers pop/open
but I'm confused as to why the ammeter needle is bouncing; it's bounces almost like one would simulate the same phenomenon by shaking the Ammeter, if it were to be disconnected, in your hands, sort of thing.
For starters, I changed the facet pump thinking it was defective when it stopped working, but afterwards re-plumbing new fuel lines with a check valve and after Installing a new pump, I then realized the wire connector was the culprit of the pump stopping -
the puno was fine but rather the wire and circuit of the auxiliary fuel pump had 2 sets of cheap plastic push-on connectors that were 15 years old and landing on rough grass field, probably exacerbated the connection to finally malfunctioning, amongst oxidization
and humidity, and quality of connector, etc.
Anyway today I went flying with the new bravex fuel pump, soon realizing the brand new bravex fuel pump stop working.
After I landed I was surprised to find out if I got a defective new pump. I then chased the wires and circuit of the auxiliary fuel pump one more, to then realized I noticed yet another cheap push on connect. I moved the last cheap connector that was part of
this circuit around, at which point the new bravex fuel pump states to work again.
I will remove this last problematic connection and splice a straight through connection.
Could my ammeter needle be bouncing abruptly because of this (last) poor connection in the auxiliary pump circuit, or could that be a coincidence and the ammeter needle bouncing in the dial be tied towards something else?
If i don't turn on the newly installed pump, the needle doesn't bounce, but rather accurately measures total current in the entire electrical circuit of the plane.
When I turned on the auxiliary pump with the engine off, the needle also did not bounce around like crazy.
When I had the engine running more or less at idle, with the auxiliary pump on, the needle did not bounce around even then.
However, once I applied full throttle and got off the ground with the auxiliary pump on, the needle then started bouncing around back and forth like crazy.
I will be fixing the last connection issue tomorrow, but thought I'd reach out to you all for any advice.
Maybe once I fix the last connection problem within the auxiliary pump circuit, will the ammeter needle stop acting this way?
Any advice is appreciated.
Thank you!
|
