Tj1 Posted January 9, 2016 Share Posted January 9, 2016 88 pioneer 4.0l 4x4 I searched and found the service manual for the fuel system but didn't help. I finally got the sending unit working, tank installed, lines run, and pump wires connected (found a couple burn/cooked wires in the cab leading to the pump fuel). I get fuel up to the regulator but no further... The line is clear, fuel lows easily, and is pressurized. I assumed the FPR was stuck shut so I bought another one. Same result with new FPR. Outside of the vacuum line is there any other reason the why fuel would not pass through? Maybe issues with the vacuum ball? Any suggestions would be much appreciated. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 9, 2016 Share Posted January 9, 2016 You need to test your fuel pressure. 39 with the vacuum hose disconnected from the regulator. No mention of fuel filter replacement. Link to comment Share on other sites More sharing options...
Tj1 Posted January 9, 2016 Author Share Posted January 9, 2016 fuel filter is new, forgot to mention. Should the fuel pressure test read 39 even if the fuel rail is dry as a bone? I have the line plugged in the FPR and the FPR sitting on a rag so I can see if fuel is coming out of the FPR when I turn the motor over. Nothing comes out with or without the vac line plugged in. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 9, 2016 Share Posted January 9, 2016 On cranking you can read the fuel pressure. Link to comment Share on other sites More sharing options...
MJCARENA Posted January 9, 2016 Share Posted January 9, 2016 Kind of sounds like you are testing the return line and looking for fuel to come out of it. The fuel comes from the tank to the line at the rear of the engine,thru the fuel rail, then thru the regulator and then back to the tank. If the fuel rail is dry as a bone, then either your pump is not working, or you have a blockage some where. Can you hear the pump working? Link to comment Share on other sites More sharing options...
Tj1 Posted January 9, 2016 Author Share Posted January 9, 2016 Ive had her in my possession for 5 months and today was the first time she fired up. Turns out there was a booger in the fuel rail plugging things up. Thanks cruiser for the help! Link to comment Share on other sites More sharing options...
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