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Registered
Join Date: Sep 2021
Posts: 2
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1982 928 runs without fuel pump on
Car starts right up when the fuel pump is off, then instantly kills when the pump is turned on. I have the pump jumpered at the relay. The car did sit for over 10 years and runs OK with pump off, not good but OK. So far I replaced spark plugs, all vacuum lines, fuel pump, fuel filter, fuel lines around fuel tank. I cleaned the fuel injectors and cold start valve injector. Also verified none of the injectors or cold start valve are stuck open. How can that car run without the fuel pump running?
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09-18-2021, 08:51 AM
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Registered
Join Date: Mar 2010
Location: Texas
Posts: 2,135
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You could have a ground issue that is back feeding power to the fuel pump. Check and clean all your grounds first.
There also could be a problem with the defroster relay. Remove it and see if the symptom still occurs.
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John Curry (Drift King) 928OC member Grand Prix White 1994 GTS AT (The GTS) Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car) 1986 Euro AT Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz) |
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09-18-2021, 09:06 AM
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Join Date: Sep 2021
Posts: 2
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Sorry it took so long. Checked all grounds, glad I did a couple were in bad condition. Pulled the defrost relay, didn't seem to change anything. Now I am wondering if the return fuel line is clogged which would build up too much pressure at intake.
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10-06-2021, 06:46 AM
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Registered
Join Date: Mar 2010
Location: Texas
Posts: 2,135
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Quote:
__________________
John Curry (Drift King) 928OC member Grand Prix White 1994 GTS AT (The GTS) Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car) 1986 Euro AT Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz) |
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10-06-2021, 09:29 AM
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