I have a 1997 Ford F-150When truck starts the fuel pressure shows real good then when you hit the gas peddle it shuts off. They are both working fine until accelerator is pushed. Computer was tested and works fine. However no diagnostic codes are being shown.
Answer:
Fuel pressure should be 30 psi at idle and when accelerator is pressed it should rise to 40 psi. If the pressure drops instead of increasing :
1) a vacuum leak at fuel pressure regulator
2) failed fuel pressure regulator
3) failing fuel pump.
