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Not getting fuel to fuel rail

Tiny
CASEY21024
  • MEMBER
  • 1988 FORD BRONCO
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
I have installed the high and low pressure fuel pumps both are runnung fine but I am not getting fuel to the rail. I dropped gas tank and out fuel pump in a can with gas and it seemed to push fuel out the top of pump could pump be wired wrong or pum backwards or maybe fuel lines to front crossed please help.
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Wednesday, February 4th, 2015 AT 10:54 AM

12 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Yes, it could be any of those things. You need to start at the tank testing pressure and volume and find out where you are losing it.
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Wednesday, February 4th, 2015 AT 11:54 AM
Tiny
CASEY21024
  • MEMBER
  • 8 POSTS
If the fuel pump is wired wrong in the tank can it cause it to reverse flow?
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Wednesday, February 4th, 2015 AT 11:59 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
If it's not using the case for a ground, yes.
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Wednesday, February 4th, 2015 AT 12:13 PM
Tiny
CASEY21024
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  • 8 POSTS
What do you mean by not using case as ground where would that be
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Wednesday, February 4th, 2015 AT 12:41 PM
Tiny
WRENCHTECH
  • MECHANIC
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If the pump has 2 wires that actually go inside of the pump, then the polarity can be reversed but if it has a single wire going into the pump and relies on the housing for a ground, it will just blow a fuse if reversed. I expect it is reversible.
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Wednesday, February 4th, 2015 AT 12:54 PM
Tiny
CASEY21024
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  • 8 POSTS
It has two wires going into tank and three wires at the top outside of unit where can I find a diagram of how to hook it up correct
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Wednesday, February 4th, 2015 AT 1:07 PM
Tiny
CASEY21024
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  • 8 POSTS
What are wire colors
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Wednesday, February 4th, 2015 AT 1:08 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
The ground wire is Black
Fuel pump power is pink with black
Fuel gauge is yellow with white
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Wednesday, February 4th, 2015 AT 3:08 PM
Tiny
CASEY21024
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  • 8 POSTS
I see a red black and yellow with brown tracer
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Wednesday, February 4th, 2015 AT 4:41 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
I don't know what to tell you. Those are the correct colors for the vehicle you gave me. Look around and see if there is a splice with color change somewhere.
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Wednesday, February 4th, 2015 AT 4:45 PM
Tiny
CASEY21024
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Ok will look tomorrow thanks
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Wednesday, February 4th, 2015 AT 4:49 PM
Tiny
CASEY21024
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Also when I dropped the tank the sending unit was not secured with the ring or seal it has a vent hole for a vent plug nothing was in it just about a 1 to 1 1/2 inch wide open hole
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Thursday, February 5th, 2015 AT 2:19 AM

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