Somthing is shutting my fuel pump down before the car cranks
New pump, new sending unit, gas is getting to the fuel rail but the pressure is dieing before it cranks drove it 15 miles it just cut off cranked back once then cut off so I changed the pump and sending unit still will not crank any ideas please
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There are a variety of problems that could cause that, but if you mash the accelerator and it dies, you may want to put a fuel pressure gauge on the fuel rail to measure your fuel pressure. Assuming you have the V8 350 in it, that engine can require upwards of 30psi at the rail, and even a few pounds less can cause it to stall. You may have a dying fuel pump or clogged filter. That's where I would start, hopefully this helps!
IT IS LOOKS LIKE A FUEL PRESSURE LEAKING INSIDE THE ENGINE OR DEFECTIVE FUEL INJECTOR LEAKING . TRY DISCONNECTING THE FUEL PUMP RELAY. AND CRANK THE ENGINE IF ALWAYS CRANK WITH OUT OF FUEL (CRANK WITHOUT START) YOU HAVE FUEL LEAK INSIDE THE ENGINE
REMOVE THE INJECTORS RAIL UP EVERYTHING CONNECTED,PUT BACK THE FUEL PUMP RELAY TURN THE SWITCH ON AND FIND WICH ONE IS LEAKING. (GASOLINE IS FLAMMABLE TAKE CARE)
it could be your fuel pump or filter....there is a check valve on your fuel rail it looks like were u put air in a tire its a litle nozzle like that.....get a little flat head or somthing nd turn your car over then push the nozzle on the fuel rail in gas should shoot out of it...or get a fuel pressure tester u hook up 2 it nd it tells u how much psi its putting out
There is a fuel pump in the gas tank that pumps gas up to the fuel rail on the engine going through a fuel filter along the way(usually on the inside of the frame rail drivers side). The sending unit has more to do with telling your fuel guage what level of fuel is in the tank. You also have a fuel pressure regulator before it gets to the injectors that keep the required pressure in the fuel system to make the fuel injectors work optimally. Best thing you can do is get a fuel pressure guage and see what the pressure is up near the motor where there is a fitting on the fuel rail that looks like an overgrown tire air fitting.
Did you check your fuel filter to see if it didn't get filled up with **** when you ran it our of gas? If you follow the fuel rail up going into the fuel intake, there should be a fitting somewhere on the line that looks like an oversized tire air inlet. If you can get a fuel pressure guage, turn the keys on a few times till the pump shuts off, then check the fuel pressure. If you don't have a pressure guage, push the needle with a screw driver and make sure there is good pressure there(carefully of course).