Papikev252
Newbie
So initially I had a P0300 code for a multiple random misfire so started with changing the spark plugs, fuel filter, wires, distributor, tested and cleaned injectors and replaced the fuel pressure regulator. I then narrowed it down to the reason im getting that code is because I have low fuel pressure. The specs call for 58-62 psi but I hooked up a fuel pressure gauge and it shows 48 psi while running and then holds 50psi when the key/engine is off. When I turn the key forward for the first 2 seconds and the pump primes it goes to 58psi but after it drops back down to 50. If I were to use a wire to jumó and keep the fuel pump going it’ll be a constant 58psi. This is also the specs I was getting with the old pump.
I've also replaced the pump as well. With the engine running and gauge hooked up I also pinched off the return line and the pressure will shoot up immediately and from what l've read is that that means the fuel pressure regulator is OK. Is it possible i put a bad pump? I have over 12v at the harness and have cleaned the ground connection. What other stuff can affect fuel pressure.
I also read this reply in another forum and want to get your opinion on the accuracy of it: “Thats normal, 55-62 is with vacuum not applied to the regulator. When idling with high vacuum a low of 45 PSI whould be normal. Fuel pressure is not your problem. Any codes stored in the ECM?”
I've also replaced the pump as well. With the engine running and gauge hooked up I also pinched off the return line and the pressure will shoot up immediately and from what l've read is that that means the fuel pressure regulator is OK. Is it possible i put a bad pump? I have over 12v at the harness and have cleaned the ground connection. What other stuff can affect fuel pressure.
I also read this reply in another forum and want to get your opinion on the accuracy of it: “Thats normal, 55-62 is with vacuum not applied to the regulator. When idling with high vacuum a low of 45 PSI whould be normal. Fuel pressure is not your problem. Any codes stored in the ECM?”
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