Hello guys. I have the 94 in my signature. I have searched and looking for some help with low fuel pressure under load. The truck has a Vulcan dual feed line 1/2 feed line from filter to dual feed. I have an adjustable tork tec overflow valve. The truck at idle no load sees 32psi. The lift pump is a cummins with less than 5k miles on it. Revved up in neutral sees 40psi. I have deleted the fuel heater also. Driving the truck no boost 35psi of fuel pressure. When you floor the truck it drops to 0 psi. Let off the throttle and fuel pressure restores. Is there any other common air leak spots in the fuel system? I appreciate the help.
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