1991 Ford Truck fuel system

Tiny
BLUECOLLAMAN
  • MEMBER
  • 1991 FORD TRUCK
  • 6 CYL
  • 2WD
  • MANUAL
  • 191,000 MILES
Fuel pump will not shut off when key is turned on. I have replaced both pumps and filter, and relay.
Friday, October 23rd, 2009 AT 10:10 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Maybe I don't under stand your post? Which pump doesn't shut off? It does shut off when you turn off the key?


https://www.2carpros.com/forum/automotive_pictures/170934_91_ford_truck_fuel_pump_1.jpg



The lite blue wire with orange stripe is ground for coil side of relay. If that wire is shorted to ground, the pump will run anytime the key is on. That circuit is grounded by the computer, when engine running, may have initial prime at key on, for a few seconds, without rpm signal the pump shouldn't run, except for prime seconds.
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Friday, October 23rd, 2009 AT 11:34 AM

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