If it is stuck the pump could continue to run. Suspect the fuel pump relay.
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Fuel pump stays on with key on. Normally the fuel pump relay operates during starting and when turning off the engine. Fuel pump keeps running after vehicle is shut off and key removed to the point that the battery goes dead. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. A full explanation of how the relay works and how to check it is quite long. Do be careful out there guys. I have a haynes manual for my 90 tsi awd that specifically states that the fuel pump should come on with the key in the on position engine off and that it will shut off after two seconds if no ignition signal is detected.
Why does my fuel pump stay on after i shut the key off answered by a verified gm mechanic we use cookies to give you the best possible experience on our website. The trigger for the relay is grounded through the ecm. Apparently no one has died or been injured enough to warrant an expansion of the recall to other models. The ground is provided electronically for a few seconds when the key is turned on and is maintained after that due to a pulse from the ignition module. Not only can the fuel pump relay stay on but in some cases it can shut off causing the vehicle to stall while operating and resulting in a crash. Mines even done that once or twice too.
It could be that replacing the relay which caused the problem to go away was conincidental. I suggest you check the net for info on how a fuel pump relay works and conduct the electrical test.
Gallery of Fuel Pump Stays On With Key On
