BobbyKnobby

I had the fuel pump replaced with a NAPA replacement. Ever since I drove the truck out of the garage the fuel level indicator will not stop shaking and I cannot get rid of a PO452 code.

Any help????

usamarshal

Well the vapor pressure sensor signal input is low according to the PCM.
Most all off the ones that I have seen it is a faulty sensor, or wiring to the sensor.
The sensor is mounted on the fuel pump module on the gas tank. It is like a map sensor, must have it for evap system testing & operation.

maxwedge

Welcome to AF, sounds like something was left off or possibly damaged when the tank was down.

__________________

BobbyKnobby

Thank you for all the info. When the new fuel pump was installed they did not properly install the fuel pressure switch. It is all better now.