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Fuel Pump starts making noise after running then car starts stumbling
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#1
05-01-2017, 04:41 PM
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Fuel Pump starts making noise after running then car starts stumbling
This is on my 1988 Audi 5000 CS Quattro.
Car started stumbling and then wouldn't run. Was told to replace the fuel pump which I did and it runs fine, until things warm up. Then the fuel pump gets louder and it will stumble and kick then shut off. I wonder if the fuel pump is getting too hot and then acting up. Should I check the grounds, fuel pump relay? Any other suggestions will be greatly appreciated. These cars has CIS injection so maybe an SC owner here experienced something similar. Thanks, Mark
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Mark Francis OG Racing: Proud Sponsor of the Potomac Region DE Program OG Racing SPB #91 93 964 C2, Polar Silver 89 944 S2, Baltic Blue 89 944 2.7 Guards Red (son's) 86 944, International Harvester Red (Oswald) 
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#2
05-01-2017, 06:16 PM
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IMO, i have seen several, similar problems associated with corroded grounds, especially on German and some British cars. Never on American cars. I'd start there.
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Richard Curtis Fairfax Station, Va. '93 911 C2
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#3
05-01-2017, 07:14 PM
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It's gonna splode!
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Hunt 611racing.com OG Racing Team Vimeo https://www.youtube.com/user/Streak986 1999 SPB #611 2004 Wrangler “That’s how people like you work. Your ego is so out of whack that it will do what ever it can to protect itself. And people with a messed up ego can do these mental gymnastics to convince themselves they’re awesome when really they are just douche bags” - Kyle, South Park "If you need to focus maybe you should buy the book and take it home" - MLIN
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#4
05-01-2017, 09:24 PM
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Quote:
ed
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ed 2016 GT4 2005 Lotus Elise 1994 RX-7 R2
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#5
05-02-2017, 09:29 AM
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Holy crap I own an Audi and I had a Pinto-----glad not at the same time.
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Ken 2023 Audi Q7 Daily Driver Considering next Porsche 1990 964, Red, Number 692 (Misty) sold 2010 Trailex (Dusty) sold 2003 996, (Speedy) Grey sold Life is short; just drive....... (boat, bike, etc.)
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#6
05-02-2017, 03:42 PM
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Richard:
I will start with cleaning all the grounds. Thanks for the info.
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Mark Francis OG Racing: Proud Sponsor of the Potomac Region DE Program OG Racing SPB #91 93 964 C2, Polar Silver 89 944 S2, Baltic Blue 89 944 2.7 Guards Red (son's) 86 944, International Harvester Red (Oswald)
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#7
05-02-2017, 03:48 PM
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Replace the fuel filter if it hasn't been done in a few years. I'm speculating a mostly-clogged fuel filter is causing your pump to work harder than designed.
On the S4 I had charcoal canister stuff get into mine because of my habitual topping off of the gas tank  Noticed the fuel pump was louder than normal and caught it in time. Subsequently noticed the fuel pump fuse has some pretty toasty looking spades.
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Jeff S '14 991.1 Carrera S Coupe '25 Cayenne E-Hybrid '11 997.2 Carrera S Cab '09 987.2 Cayman S '05.5 Audi S4 '25 GMC Yukon XL '17 718 Boxster '18 718 Cayman x 2
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#8
05-02-2017, 05:28 PM
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If it's cis check the fuel pressure at the warm up regulator. The pressure increases with temp. It's lower when it's cold.
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"This looks dangerous daddy. Don't I need some goggles or sumthin' ?....Goggles are for pussies Rusty. Don't be no pussy.."
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#9
05-02-2017, 05:36 PM
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Don't listen to that last post - he knows NOTHING about these cars!
Thanks for showing up and chiming in, John. For those who don't know John Behe, when Dwayne Moses co-drove my car to a win at VIR (note which driver's name wasn't mentioned with "win" in the same sentence), he felt the car was low on power. I took the car to Behe and got it back with about 20 (yes twenty) more horsepower!
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Peter (not "Pete") K. 2026 Lucid Gravity Grand Touring (EV Tow Vehicle) 1997 Spec Boxster #671 2016 Cayman S 2016 Toyota Highlander--wife's DD 2017 VW GTI SE (DD) Gone and missed: 2003 Miata ("SM") race car 1992 Miata ("SSM") race car 2009 911 C2S Coupe 2004 Toyota Prius - sold to son's girlfriend 2006 Dodge Durango 2003 Acura MDX 86 Black 911 Coupe race car 86 Gold 911 Targa 82 WineRedMetallic 911 Targa
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