Fuel problem
New User
Joined: Apr 2000
Posts: 12
Likes: 0
Fuel problem
I just inherited a new problem this morning where when I shut off my truck, the intank fuel pumps keep running. I switched from from front to rear tank. The pump in the front tank would go off, but the one in the rear would start, Is theree suppose to be power at these units when the key is off? I am leaning towards thinking that the fuel pressure regulator is the culprit, I am wondering if any of you all out there have experianced this and what might be the quick fix? The truck is my 91 supercab with a 5.0 ltr.
86F150 302 S/C, 87F150 302 S/C, 88F150 Reg, 89F250 4X4 Diesel, 91 F150 S/C 302
86F150 302 S/C, 87F150 302 S/C, 88F150 Reg, 89F250 4X4 Diesel, 91 F150 S/C 302
Posting Guru
Joined: Feb 2000
Posts: 1,100
Likes: 0
From: Wichita USA
Fuel problem
Can't be fuel pressure regulator it is mechanical. Most likely fuel pump relay. Allthough I would expect it to effect both tanks because they do not use different relays. Posible it could be shorted wires if there is a wire in the harness going to the tank switch that has battery power on it and it got together with the one powering affected tank.
Postmaster
Joined: Jul 1999
Posts: 3,172
Likes: 4
Fuel problem
Northerner ,
Nitro is correct with the fuel pump relay most likely being the cause . Because you only use one pump at a time , they both use the same relay . A simple way to resolve it is tap the relay ( 9 times out of 10 the tapping will cause the relay to shut the pump off ) If it shuts off , replace the relay . They are cheap and take like 5 mins to replace .
Paul
Nitro is correct with the fuel pump relay most likely being the cause . Because you only use one pump at a time , they both use the same relay . A simple way to resolve it is tap the relay ( 9 times out of 10 the tapping will cause the relay to shut the pump off ) If it shuts off , replace the relay . They are cheap and take like 5 mins to replace .
Paul
New User
Joined: Apr 2000
Posts: 12
Likes: 0
Fuel problem
>Northerner ,
>Thanks tapping did the trick, I replaced the solenoid and no more problem
>
> Nitro is correct
>with the fuel pump relay
>most likely being the cause
>. Because you only use
>one pump at a time
>, they both use the
>same relay . A simple
>way to resolve it is
>tap the relay ( 9
>times out of 10 the
>tapping will cause the relay
>to shut the pump off
>) If it shuts off
>, replace the relay .
>They are cheap and take
>like 5 mins to replace
>.
>
>
>
> Paul
86F150 302 S/C, 87F150 302 S/C, 88F150 Reg, 89F250 4X4 Diesel, 91 F150 S/C 302
>Thanks tapping did the trick, I replaced the solenoid and no more problem
>
> Nitro is correct
>with the fuel pump relay
>most likely being the cause
>. Because you only use
>one pump at a time
>, they both use the
>same relay . A simple
>way to resolve it is
>tap the relay ( 9
>times out of 10 the
>tapping will cause the relay
>to shut the pump off
>) If it shuts off
>, replace the relay .
>They are cheap and take
>like 5 mins to replace
>.
>
>
>
> Paul
86F150 302 S/C, 87F150 302 S/C, 88F150 Reg, 89F250 4X4 Diesel, 91 F150 S/C 302
