Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Fuel pressure for your truck should be around 36 psi. That is crazy fuel pressure. Are you sure the gauge is good?
The codes you have, did you use a code reader to get them? Also, the P0506, do you mean P0505?
Well, the fuel pressure is nuts. That is something you may want to stick another gauge on to verify. The fuel filter is a external filter so that should be change if not changed in a while.
As for the code, I am using the factory service manual and the code P0506 is not a good code. The closest code is the P0505 which is for the Idle Air Control Valve. Which could also make sense on what the truck is doing, but doesn't make sense on for the fuel pressure gauge. The other code is a Knock Sensor, that code does not turn on a Service Engine Light. Normally you find this code when something else turns on the light.
Are you a shop?
Is this Super charged?
I am using the Factory Service manual. The P0505 is a Idle Speed Control code. So it is more or less the same thing. Just was wondering why it's is reading the code wrong. No biggie.
So with this code, the Idle Air Control normally will need the IAC replaced and could have damaged the Ecm when it fails. This can certainly affect how the truck runs.
The fuel pressure, I can't see any way it can put out 100 Psi! That would blow up and damage injectors if that is true. I have never seen anything like that. I would borrow another gauge to verify that if I encountered that. Thinking my gauge has to be wrong. That is also why I have two volt meters. If I can't believe a particular voltage, I will double check it.
The only way that would happen is if you got the wrong fuel pump. It is a 12 volt circuit to power the pump.
Is the fuel pump you installed from the dealer or after market?
Also where are you checking the fuel pressure? What line are you tapping into? Are you tapping into the fuel system in line?
Is the gauge you are using a inline type of gauge or does it just go into the end?
What is the fuel pressure when you check it in line before you pinch the return?