Running Fuel Pumps
I have a problem with my 1988 F-150 302 V8 EFI. When I shut the engine off, the fuel pumps keep going. They have two, the low pressure one in the fuel tank and the high pressure one attached to the frame rail. It started couple weeks ago, they would run for up to a minute, but now they don't shut off at all. I have to use the kill switch on the inside of the firewall behind the clutch pedal to shut them down. I've looked in a couple of shop manuals and nothing there under troubleshooting. Could it be the microprocessor for the fuel? Any ideas? Thanks.