No fuel pressure to rails

Tiny
MRBIGDOG
  • MEMBER
  • 1989 FORD F-250
  • 7.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
Truck has sat for a year or two.
Ran fine when parked.
Has dual fuel tanks.
Not getting pressure to the fuel rails.
I don’t think either tank fuel pump is turning on.
Replaced fuel filter on frame in front of the high pressure pump on frame rail under drivers side cab.
Replaced fuel pump relay.
When I turn the key to run position the relay clicks and the high pressure pump comes on for about three seconds and shuts off.
When I try to start it the high pressure pump comes on again until you stop trying to start it.
I’m lost from here, can anybody help?
Sunday, June 23rd, 2019 AT 11:55 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The first thing I would do is drop and tanks, flush them out of all the old no good fuel and replace the pumps. Fuel that old will not fire and will ruin the pumps.

Did you verify spark?

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy
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Sunday, June 23rd, 2019 AT 12:14 PM
Tiny
MRBIGDOG
  • MEMBER
  • 3 POSTS
Good afternoon,

Thanks for the reply.
We pumped most all the gas out of both tanks and replaced with new.
Yes it has spark, if I put a little gas in a spray bottle and squirt it into the plenum it will purr like a kitten until I stop.
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Sunday, June 23rd, 2019 AT 4:28 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Do you hear the pump run with the key on?

Roy
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Sunday, June 23rd, 2019 AT 5:04 PM
Tiny
MRBIGDOG
  • MEMBER
  • 3 POSTS
I cannot hear either tank pump run with the key on no matter what position the fuel tank selector switch is in.
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Sunday, June 23rd, 2019 AT 8:12 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I attached a couple of diagrams for you to view for the circuit for the pumps. You will need to test for power to the pumps to verify the wiring is good.

https://www.2carpros.com/articles/how-to-check-wiring

Roy
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Monday, June 24th, 2019 AT 2:32 AM

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