fuel pump/filter hum

[sinistervii]

1.8 fwd a4.... Was having a gurgling noise from the fuel filter a few months back after getting gas. Then something started humming while priming the fuel system. I suspected fuel filter. Replaced with OEM filter from Audi.
After replacing filter I primed the system then finally started the car. When I did there was a horrible whinning noise from the filter for about ten seconds. The problem now im having now is that , maybe every ten to 15 times the car is started theres a faint humming noise at prime. It will go away after that. there are a few times that while driving that I will hear it from a dead stop going into first then second.

I don't know if its fuel pump darling or filter needs replacing again. I haven't done a pressure tests on the system yet, but I've taken the lines off the filter and primed the system and it did dump out a quite amount of fuel.

Thanks ahead for any suggestions

[sinistervii]

Well... an update on this issue since nobody replied...

took the pump out lastnight, the fuel tank had some black flack stuff in it, fished all that out with a net. the filter on the pump itself had some build up on the bottom and inside screens. Checked the actual pump itself to see if there was shaft play or any of the bushing where broken up on 12 volts and it handled fine. put the pump back together and WALAAA. no more noise. Just that when the system prime after starting the car I think that the fuel pressure regulator in the filter itself is having issues because it was making an awful sound. I checked the return line at the fuel pump and it was vibrating really bad. checked the out line of the pump and there was no vibration. Called AUDI and they said they will replace the filter at no cost since it is only 2 weeks old.


So any of you that are having pump noise and issues, I would suggest taking about 2 hours out of your day and breaking the things down piece by piece, its pretty simple. the only thing is on the FWD 1.8 that when you take the pump out, theres a clip on the actual pump housing inside the tank that has a hose and another one running off of it to the tank itself. That is you return line. Un clip it by putting two fingers inside the fuel tank and pull that line completely out. It took me awhile to figure on how to get the darn thing out. then after that is easy as cake from there.

[NFX123JMP]

Thanks for taking the time to post this. I'm sure it will help someone out in the future. Glad you were able to diagnose and fix this.

[teespeed]

My experience, 8 times out of ten it's the filter only. Gets replaced and all noise is cured.

[gregg3gs]

in both my a4's it has always been the filter.

Thanx for your input.

Also, try search next time. (I have replied to this like three times at least)

[sinistervii]

@gregg. still trying to get used to this forum

as for the pump.... it still has a slight hum. but nothing to worry about since its 100 outside. also searched other forums on fuel pumps and in some vw audis its a normal thing. also if any of yours is going out or has to be replace you can also check out www.vdo.com theyre the manufacture of our pump. all you would have to do is grt ahold of a distrubitor. the price if i can remember quited was 279 for the OEM PUMPS.

[gregg3gs]

@gregg. still trying to get used to this forum

as for the pump.... it still has a slight hum. but nothing to worry about since its 100 outside. also searched other forums on fuel pumps and in some vw audis its a normal thing. also if any of yours is going out or has to be replace you can also check out www.vdo.com theyre the manufacture of our pump. all you would have to do is grt ahold of a distrubitor. the price if i can remember quited was 279 for the OEM PUMPS.

thanx,

yeah, the search is a bit tricky.