mjay2020

what my car is doing is when i turn ignition on, i can hear fuel pump priming. It will start fine but 20 seconds after it started i hear what sounds like electrical noise coming from engine compartment. it is either the MAS or FP relay under MAS or something and then the car stalls and dies. when the car dies, all i hear is the FP running till I turn ignition switch off.
Can anyone help, plz

AdderMk2

stop using incorrect abbreviations and explain your problem.

So your car stalls after about 20 seconds?

Have you tried keeping your foot on the gas to prevent it from stalling?
Have you tried running a 12v+ source to the fuel pump so it runs constant (for testing)?
Have you tried replacing the relay?

mjay2020

I have tried giving it gas so it dont stall: DON'T WORK
I've replaced both relays under seat and engine compartment: DON'T WORK
I haven't tried running a 12v to the fuel pump, how do I do that and where do I connect that 12v too?

AdderMk2

Things you will need:
Fuel pressure testing kit
20' of 14-12ga wire


Open up the hatch of the car
On the drivers side of the hatch, in front of the tail light, you will find the fuel pump inertia switch.
Unplug the inertia switch, run a 12v+ lead from the battery and into that plug.

You should hear your fuel pump power up. If it doesn't turn on, stick the wire into the other side of the plug.
Once the pump is powered up, check your fuel pressure. FP spec is ~39psi with no vac source on the FPR (like if the engine isnt running). Report back your findings if the pressure it lower than that.

If your pressure is ~39psi +/-3 PSI, the car should start.

If the car will still not run, it is likely that your problem is ignition related. i.e PIP, or Ignition module.