Ok, so my truck has been running pretty rough here lately, I have replaced the plugs and wires, mass air flow sensor, Ignition coil, and ran sea foam through it. My friend came over last night and hooked his computer up to it and we got 512 (Ithink) which I believe is No Codes In Memory. We also ran a fuel pressure test. The static pressure has me kind of puzzled. As soon as you turn the key on, the pressure jumped up to 35 psi but within a second, it drops to 6 psi. I believe the specs call for 35-45 psi (key on engine off) The fuel pressure is also a few pounds low while the engine is running too. With the engine running I am getting like 24-26 psi. I think the specs call for 30-40 psi here. (Key on engine running) Today I pulled the Fuel pressure regulator off, it was holding pressure to the fuel rail. The diaphragm is not leaking but I don't know if there is anything else to check on it, it is holding vacuum, and has good vacuum to it. Any suggestions would be helpful.
Thanks in advance
Friday, August 21st, 2020 AT 12:51 PM