I have a 94 gt 5.0 that will not crank . I have replaced the fuel pump and I know that is working correctly because it will pump fuel out of the fuel line where it meets the fuel rail but it seems like the fuel is not entering the fuel rail. I sprayed fuel directly into the throttle body and the car started so I'm sure the problem is at the fuel rail. Anyone have any ideas or suggestions please help! Thanks.
You'll want to check fuel pressure, just because the pump is capable of open-flow pumping doesn't mean it can build up enough fuel pressure to get the car started. Other things could be clogged / stuck / inoperative fuel injectors (lots of things could cause that but it's sometimes the distributor pickup) or a bad fuel pressure regulator (the fuel pressure check can help diagnose that) or bad fuel (if what you sprayed didn't come from the tank).
If your reading was done properly (15lbs is the max pressure that the rail shows after turning the key several times to build up pressure) then the possibilities are fuel filter, fuel pump, pressure regulator, or a fuel injector stuck open (causes all the fuel to drain into a single port). It's supposed to reach ~39psi.
It's not impossible for a new pump to have problems unfortunately. If you pull the vacuum hose off of the regulator and find fuel then the regulator very well could have gone bad. The stuck open injector is easiest to test by pulling the rails out of the manifold and turning the key, and seeing if one shoots out fuel (it shouldn't until the car is cranked). Good luck.
Well the regulator was bad had fuel in the hose replaced it and still nothing so going check the injectors.
The fuel pump is pumping but could it still possibly be bad? Once we replaced the regulator the fuel pressure went to 20lbs instead of 15lbs. Would this be caused by the injectors or something with pump
I know on the stock fuel pump you could hear the pump come on when the key was first turned on. Does that apply to all electric pumps? Should I be hearing the new when it comes on. Like I said I know it's pumping some but I don't know if it's doing
You should be able to hear it buzzing when you turn the key. If you can get a helper, you can definitely hear it if you get close to the tank and someone else turns the key. If it's pumping some but not powerfully (and very quietly), you might want to check that you're getting a full 12V to the pump. Could be a wiring / connector corrosion issue.