89 F250 5.8 Having Hard Time Getting Fuel Past Regulator

Drew Owner/Technician Ocala, Florida Posted   Latest   Edited  
Question
Driveability
1989 Ford F-250 Custom 5.8L (H) 4-spd (AOD)
Crank / No Start

Recently changed high pressure pump, fuel filter, regulator and getting fuel to pressure regulator, but can't get it to fuel rail any thoughts?

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Albin Diagnostician
Leavenworth, Washington
Albin
 

Where are you testing the fuel pressure? I would assume you are testing at the test port on the fuel rail. The fuel pressure regulator sits at the end of the fuel rail, and holds pressure in the rail, then it dumps the fuel back to the tank. What is the problem you are trying to fix?

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Robert Diagnostician
Ballston, New York
Robert
 

Fuel does not enter the fuel rail through the regulator. It leaves the fuel rail and returns to the tank through the regulator. The less returned fuel there is the higher the rail pressure will be. As Albin stated please describe what you are trying to repair.

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Drew Owner/Technician
Ocala, Florida
Drew
 

No start due to no fuel getting to fuel rail getting it from pump all the way up,but none in rail when I go test port none there.

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Albin Diagnostician
Leavenworth, Washington
Albin
 

perchance is the fuel being pumped to the return side of the pressure regulator? As I stated before, the fuel should be pumped to the fuel rail, then return to the tank through the pressure regulator. If you have fuel pressure at the pump, how did you test it? If there is no pressure at the test port, where is the blockage between the pump and the rail? Maybe the pump is running backwards and is

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Charlie Owner/Technician
New Orleans, Louisiana
Charlie
 

Did you disconnect the fuel pressure regulator from the fuel rail and get fuel cycling the key? If so, you have to have fuel in the fuel rail. Check your fuel pressure line fitting on your fuel pressure gauge. Is the stem valve being pushed down and opening?

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Drew Owner/Technician
Ocala, Florida
Drew
 

I will check for blockage,I did push the Schrader valve on test port,but no fuel there,I also disconnected fuel line from high presure pump before and after filter both getting fuel through.

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Robert Diagnostician
Ballston, New York
Robert
 

Either the lines are swapped or there is a restriction in the lines between fuel rail and filter. Have you removed the schrader to verify that is not plugged? How much pressure is at the fuel filter outlet?

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Drew Owner/Technician
Ocala, Florida
Drew
 

I will do that and see thank you all.

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Daryll Diagnostician
Seymour, Tennessee
Daryll
 

Sounds like somehow the fuel supply and return lines got swapped, even though they’re not the same size. Fuel pressure supply comes in on the larger port, goes thru the rail, then thru the regulator to return to the tank. If you connect both lines at the engine, cycle the key, do you get fuel out of one of them? If so, is it the larger fitting?

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