Posted by farmer boy on March 28, 2014 at 18:02:03 from (199.167.109.42):
In Reply to: OT. Truck Issue posted by MN Scott on March 28, 2014 at 11:19:19:
My first thought with any 1st Gen Vortec is the fuel pump. They can go bad very quickly. Check the fuel pressure at the schrader valve. Does this truck have the updated spider assembly? I had a simliar issue that went away when I replaced the pump. It would stumble and not accelerate over 3000rpm. If I put the truck in neutral, turned the key off, then back on, the issue went away for a while.(could be 20 minutes, could be a day) If the truck starts, it likely isn't the PFR, because cycling the key likely wouldn't help. The fuel pressure needs to be ATLEAST 58 psi to start,(more is better) and no lower than 50-52 psi to stay running.(again more is better) When you shut the truck off, keep reading the pressure. It should stay put. It could do down in 5 minutes, it may hold for 24 hours. If it holds for anything less than 20 minutes, clamp the rubber portion of the return line as you turn the truck off. If it holds, the FPR is the problem, if it doesn't, there's a leak internally, agian, likely the FPR. My bet would be the fuel pump. Have you had trouble with the fuel pump before on this truck?
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