Can you have too much fuel pressure. I have a 2003 f150 xlt 4x4 and the fuel pump i need puts out 60psi. Is that too much ? Or will i be ok? I just replaced the FP but come to find out it was for a reg cab 2 wheel drive and my truck runs like crap.also would it be ok to drive it? I only have the 1 vehcle and i need to get to the auto parts store.

 

Yes and no on too much pressure as the pressure regulator helps hold pressure. A 60psi is what your truck pump should be, but the pressure at the rail should be around
see below:

fuel pressure test gauge check:
Without starting the engine turn the ignition key to the on position the gauge should jump up to between 45 psi and 58 psi (DPI) direct port injection systems, throttle body injection (TBI) should be between 13 and 17 psi in most cases as the system primes. If no pressure is present recheck the hose or adapter connection to avoid any false negatives, re-cycle the ignition switch to recheck. Still no pressure? suspect a bad fuel pump, fuel pump relay, or fuse.

Now start the engine so we can test the performance of the pump. While the engine is running, the fuel pressure should drop about 5 psi, from the static prime pressure (DPI) then snap the throttle, the fuel system pressure should jump up about 5 psi. this means the fuel pump and pressure regulator is working correctly. If the system fuel pressure does not respond inspect the regulator vacuum feed line and if okay the fuel pressure regulator has failed (if equipped).

The final check will be the load test. This test will determine how the pump performs under a load of use. This can be achieved in one of two ways, first, you can load the engine by having the transmission in reverse (automatic) and hold the brake while gently giving the engine a slight amount of throttle. This will load the engine while not allowing the car to move effectively loading the engine and fuel pump. The second way is to close the hood to the first safety catch and drive the car (not at highway speeds) while the gauge rests outside being visible to the driver. The hose will route from the side of the hood while using masking tape to secure the gauge. The pressure should hold continuously throughout the test. If the fuel pressure is low under load or while idling the fuel filter (if equipped) could be clogged, or the fuel pump has failed and needs replacement.

Remove the fuel pressure gauge and reinstall the dust cap or remove the fuel line adaptor to clean up any excess fuel.

 

On a 2003 model year you have a two pipe system of feed and return.
On the fuel injector rail, driver side, is the pressure regulator. and test port.
The regulator drops the pump pressure to about 35 psi+/-.
for injector rated operating pressure.
The Vacuum line to the regulator reduces the pressure further about 5 to 8 psi (at Idle) when the injection amount would be too excessive for Idle when the motor does not need that amount of fuel.
Snapping the throttle or removing the Vacuum hose will change the Idle pressure, as a test providing there is no fault present.
Fuel volume is another thing. If the volume is goes low while driving, the motor will get doggy from lack of sufficient fuel >>(Leanness).