I have a 1990 Ford F150 truck with Fuel Injection.
It's got the 5L engine.
For some reason, when the weather is cold, every so often I shut off
the ignition switch, and I can hear the electric (in tank) fuel pump
still running. Rotating the key will not stop it. The only thing
that works is to restart the truck and shut it off again. This
usually stops it. Or I can disconnect a battery cable.
What is causing this, and how do I fix it? The IGN switch shuts
everything else off, so I doubt it's the switch itself, unless they
have a separate contact just for the fuel pump.
On Mar 11, 2:52 am, firstname.lastname@example.org wrote:
This is just a wild guess, but it could be the fuel pump relay
freezing and sticking. Next time this happens try rapping on the
relay with something light and non metalic like a pen or wooden dowel.
Thanks Calvin for the advice. However, could you please tell me where
this relay is located. I dont have a clue. I'm assuming the relay is
direct wired on the output side and the ign switch controls the input
or trigger side. I know how relays work, but I dont know it's
location. If it's sticking, that sounds like an easy repair, as long
as it's in a place thats not hard to reach. I know I need to fix this
because it drained my battery once, and I'm sure it's not good for the
fuel pump either.
On Mar 12, 1:26 am, email@example.com wrote:
Check your owners manual - it should have that info towards the back
with the fuses. On my 95 bronco there are two power distro blocks
under the hood, but I don't know if that applies to your '90. Usually
they are either along the inner fender wall or near the battery. It
would be a square plastic shield covering a group of black or grey
cubes - the relays themselves.
I dont have an owners manual. Truck was used, and no manual was
included. At least I know what to look for now. I know there is a
major power block near the brake master cylinder.
Just curious, this truck had 2 gas tanks and a switch on the dash to
select them. I only use the front tank because the rear leaks and the
pump is bad in it. Is there a separate relay for each tank?
I may replace that tank when weather allows, but for now, if there are
2 relays, maybe I can just swap them. I suppose they might use the
same one for both too ???
I wonder if that Autozone site has any info on this? Guess I'll have
to look there.
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