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!
