This is happening on a friends truck. The fuel pump won't stop running even with the truck turned off and keys out of the ignition. We have to disconnect the battery for it to stop or it will kill the battery. We've pulled some fuses and it keep running. The truck has two tanks,even with the fuse pulled for the switch that changes the tanks, when we hit that button it still trys to switch tanks. We disconnected the switch and the pump was still running. any ideas would be a great help...
thx T

 

A year sure would be helpful, if you're feeling froggy an engine size would help too.

 

its an 1988... checking on motor size

 

351

 

Fuel pump relay is stuck. You should have three relays side by side on a fender one is brown, one is black, and the other is green, that would be the fuel pump relay.

 

thanks we'll try that

 

if its stuck what should we do?

 

fixed! thank you