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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

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

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USA +1 213 984 1237


PIPISTREL AIRCRAFT DEALER OF THE YEAR 2012
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