Ethan12v
Broke
I apologize in advance about what I'm going to put you guys through...
I've been chasing down a fuel pressure issue ever since I bought my truck. Mods are current in my sig. First off my idle pi is set for 21psi, it seems to hold this adequately without much fluctuation. I can accelerate and it will build pressure but once it starts to crest about 1500rpm, my pressure drops down to about 19psi. In here to tell you after reading numerous writeups, TSB's, and searching forums. I've nearly touched every point of my fuel system to look for leaks and restrictions. I have installed a new lift pump.... From orieleys... I know :nail: (the brand is Precision). I have a Tork Tek OFV thats nearly bottomed out against the seat to keep my 21psi idle, I've installed brand new 3/8 hose on both ends of the hard steel lines running along the frame (sending unit to hard line and hard line to hard line going into prefilter housing) therefore eliminating the clips. I only have hose clamps now. Ive cleaned my prefilter, I lifted my bed and cleaned my sending unit screen. I looped a 1/2" hose from the pre screen to the lift pump, used hose clamps. I have a brand new fuel filter in the housing. Yet I cannot stop the truck from loosing fuel pressure.
I bought a 14 ft piece of 3/8 fuel line and ran it all the way from the tank to the hard line going to the prefilter housing just to test if the hard steel lines. It mad no difference whatsoever.
I put a sight glass in the rubber line going from the tank to the steel lines, no bubbles
I put the sight glass in the rubber line connecting the steel lines to the hard line on the prefilter, still no bubbles
Ive pressurized my tank with shop air multiple times and waited, no fuel leaks
HOWEVER, when I kink my return line, pressure will shoot up like everything is hunky dory.
Ive taken my OFV apart. Seal seems okay. The seat doesn't "look" damaged. Appears to be all in working order.
My questions are .. Can this be caused by an IP or injector issue?
Does the return line affect fp at all? Say the hose has a loose connection up by the tank
Is it possible that the IP is just flowing more than the stock LP can keep up with at higher rpm?
Anyway, theres my novel... I just really need help
Thanks
I've been chasing down a fuel pressure issue ever since I bought my truck. Mods are current in my sig. First off my idle pi is set for 21psi, it seems to hold this adequately without much fluctuation. I can accelerate and it will build pressure but once it starts to crest about 1500rpm, my pressure drops down to about 19psi. In here to tell you after reading numerous writeups, TSB's, and searching forums. I've nearly touched every point of my fuel system to look for leaks and restrictions. I have installed a new lift pump.... From orieleys... I know :nail: (the brand is Precision). I have a Tork Tek OFV thats nearly bottomed out against the seat to keep my 21psi idle, I've installed brand new 3/8 hose on both ends of the hard steel lines running along the frame (sending unit to hard line and hard line to hard line going into prefilter housing) therefore eliminating the clips. I only have hose clamps now. Ive cleaned my prefilter, I lifted my bed and cleaned my sending unit screen. I looped a 1/2" hose from the pre screen to the lift pump, used hose clamps. I have a brand new fuel filter in the housing. Yet I cannot stop the truck from loosing fuel pressure.
I bought a 14 ft piece of 3/8 fuel line and ran it all the way from the tank to the hard line going to the prefilter housing just to test if the hard steel lines. It mad no difference whatsoever.
I put a sight glass in the rubber line going from the tank to the steel lines, no bubbles
I put the sight glass in the rubber line connecting the steel lines to the hard line on the prefilter, still no bubbles
Ive pressurized my tank with shop air multiple times and waited, no fuel leaks
HOWEVER, when I kink my return line, pressure will shoot up like everything is hunky dory.
Ive taken my OFV apart. Seal seems okay. The seat doesn't "look" damaged. Appears to be all in working order.
My questions are .. Can this be caused by an IP or injector issue?
Does the return line affect fp at all? Say the hose has a loose connection up by the tank
Is it possible that the IP is just flowing more than the stock LP can keep up with at higher rpm?
Anyway, theres my novel... I just really need help
Thanks