[s-cars] fuel pump switch

[Dave Forgie]

Jerry: It would be possible but I would NOT advise it. Under the existing protocols, the ECU triggers the main fuel pump relay (under the drivers side knee bolster on North American UrS cars) ONLY after the ECU has received a signal from the cam position sensor (or crank sensor) that the engine is going around, i.e. being started.  The good thing about this is IF you are in an accident that stops the engine, the ECU shuts off the fuel pump, i.e. the risk of a car fire is decreased.   

To do what you want to do, even if it was necessary, you would have to engergize the fuel pump via a "hot" switch, pressurize the fuel system, and THEN remember to turn the "hot" switch off and then start the car normally.  However, IF you forgot to turn the hot switch off, it could get real "HOT" in an accident.  

If there is a fuel line draining issue, its probably better (safer) to replace the check valve which has failed, which in this case, I believe, is in the fuel pump.  Fuel pump is probably due for replacement anyway.

A fuel pump replacement procedure that I wrote up is available at:

http://forums.audiworld.com/s4s6/msgs/86586.phtml

Dave F.



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