Noisy Fuelpump?

[ineora]

Is this normal?



Link to video: http://youtu.be/TUjzkjV7cww

My fuelpump sounds fine right after startup everytime from cold but after e few minutes it starts to make sounds and twitch every other second. It's kind of a whining sound for half a sec.
Is something clogging the hose from the fueltank so it runs dry or is it that motronic is telling the pump to rest every other second because the engine has enough fuel already? This is only on idle, can't hear the pump when pushing the throttle because of missing exhaust.

I know the old original pump kept pumping all the time but that was with original KV engine and mechanical injection. Now i have 3B engine and Motronic ECU with 3B harness.

I have run new power and ground and relayed the FP because there was a constant burning of the FP fuse after i installed the new FP, the fuse now holds when the new wires are run from the battery, but the old signal wire is still in use, could the signal wire be shortening every other second causing this behavior and the previous fuse-burn?

Thanks - Tobias.

Edit: how do i embed a video in the post? Instructions please.

[UrS4boy]

External fuel pump?? Why? Is there at least a transfer pump in the tank to feed the external fuel pump (ala VW Golf/Jetta Mk2)?

As for the ECU temporarily shutting the FP off because the engine has enough fuel, the answer is "That is NOT the way the fuel system is SUPPOSED to be set up". The fact that you have an external fuel pump leads me to believe that your fuel system might not be normal with respect to the required return line.

UrS Fuel System: From the Tank to Injectors and Back Again *CLICK ME*

[ineora]

I guess i should have let readers know this is a coupe gt type 85 that uses a 044 style external only pump when it left The Factory. Mounted underneath floor under the backseat next to filter and an accumulator (now removed)

[AndyP]

I've been out in a 20v RR engined Ur quattro today with an externally mounted 044 pump and it is noisy, but it's noisy all the time not in bursts like yours.

[UrS4boy]

I guess i should have let readers know this is a coupe gt type 85 that uses a 044 style external only pump when it left The Factory. Mounted underneath floor under the backseat next to filter and an accumulator (now removed)

Yes, that info would have helped. Why no accumulator? The factory put them there for good reasons, right? Just deleting it might be the source of the problem.

[ineora]

I've tried 2 different pumps and both with and without the accumulator. The acc. is btw for the old mech injection. Now its electric. The s2 or s4 doesnt have this either afaik..?