Fuel pump not working properly

Can I ask how you know the fuel pump is shutting off? Are there any DTCs? Have you made any repairs like replacing the fuel pump?

Just looking for a little more info so I don't recommend something that you did.

I would suggest starting with monitoring fuel pressure when this cuts off and when you first turn the key on.

Okay. You are correct that the module directly controls the pump but the PCM is what is considered the control module. Ultimately the PCM is what tells the FPCM what to do. I would go to either the PCM or the FPCM and measure voltage on the FPC wire. The FPM is the monitor circuit and the PCM uses this to determine if there is an issue. If this is shutting it off, then there may be a code. If we haven't checked for codes, I would do this before replacing the PCM. It could be a PCM issue but it could also be something that the PCM is seeing that is causing it to cut the pump off.

That is interesting. Yes. It could definitely be the issue. Clearly it should not be that way so even if it doesn't fix this it should be taken care of. I would go ahead and do it and see if that fixes all of it.

I doubt the ignition module would cause this and no the MAF will not cause the fuel pump to shut off. Have you checked for codes? I suspect we have a code that will point us in the right direction.

P0453 - EVAP Emission System Pressure High
P0455 - EVAP System Leak Detected
P0581 - Cruise Control Multifunction high
U0109 - Lost communication with the fuel pump module
P025A - Fuel Pump Module Control Circuit open

This is kind of what I suspected. You have a wiring issue. I would focus on the P025A and U0109. The other codes are not going to cause the fuel pump issue.

I attached the test that you need to follow. It is lengthy but should take you to the issue.

You checked the connections but did you check the wiring from end to end for an open or a short? Based on the codes that you have, a PCM is not mentioned as a possible cause so I doubt it. You have circuit codes so more than likely you have a pinched wire somewhere. The other thing named is a fuel pump but you already changed that.

You need to remove the connectors from the fuel pump and test the resistance from there all the way back up to the PCM. Start with measuring resistance from the pump to the control module. Then the control module to the PCM. I suspect one of these wires will have high resistance or even be open.