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isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

I believe that the fuel pump is going bad. I can't hear it being louder, but while driving under most conditions, the car seems to lose power for a split second. This happens moreso on big bumps, but also on left turns sometimes. It could be a connection, but I tried pulling/wigling the wires to both pumps and everything was fine. What are the symptoms of a bad fuel pump besides the louder noise?

Thanks,
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Smoothie · Posted: Fri Oct 06, 2006 8:41 am Post subject:

When mine went, the first symptoms were crappei running and changing sound from the fuel pump that coincided with the poor running. I verified it with a CIS fuel pressure tester - that showed changes in primary (aka- "system") pressure that coincided with the sound changes.
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Mine started blowing relays.
It sounds like a fuel filter issue to me.
_________________
1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.

Min · Posted: Fri Oct 06, 2006 9:43 am Post subject:

Could also be rust in the tank blocking the inlet, which would be why bumps/turning would make a difference.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Changing the main fuel filter won't help with rust in the intake, (but it's worthwhile doing anyway). If you've got an in-tank LP pump you can remove that and see if there's anything clogging the strainer mesh...
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

Ozzie · Posted: Sat Oct 07, 2006 3:11 pm Post subject:

Sound like an ign system failure about to occur to me.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

Like distributor?
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Two things to check if you have not yet

The fuel pump relay and the ignition switch.

Many times the ground wire begins to pull out from the back of the relay board and you hit a bump... the wires bounce and you get an intermittant signal to the relay.

Same thing happens to the ignition switch... but this is more wear and tear. I have had the circuit that the radio is on go out on mine. Funny when that happens... I thought dang! My new radio is toast already!

I would suggest going through the tests in the haynes manual on the pump and change the filters anyway. It is always good to have clean fuel

Though it is a bit-ch to change them. At least for me.

Good luck

Eric
_________________
1982 924
1992 968
2003 C4S
Parts Parts Parts and More parts.
E-mail me for parts you need!
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Ozzie · Posted: Wed Oct 11, 2006 7:57 am Post subject:

I am thinking a bad wire/connection/switch or relay.
Intermittent faults are a cow cos they'll always work at the auto electricians.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

It can't be the radio as I don't have one installed. I will check the relay and wires.
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Haha I did not mean the radio screwed anything up. What I meant was the ignition switch can fail. Some times it is the start position some times it is the run and different circuits can fail. LOL! Radio no in your car... that is funny.
_________________
1982 924
1992 968
2003 C4S
Parts Parts Parts and More parts.
E-mail me for parts you need!
Drive Fast!

Nobbi · Joined: 24 Aug 2006 Posts: 1396 Location: Germany

Howdie,

if you carry a lot of Keys on your k-ring the ignition switch will be dead much earlier.
By the way, the noise from the fuel-pump doesnt bother me at all.Mine is singing in diffrent tunes since about 15 years! i think i will die before the dammed thing.

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK