My Cadillac starts an cuts off new fuel pump,filter,plugs,wires,no error codes new fuel regulator can anyone help
8 Answers
mikeatpriestlake answered 9 years ago
u are gonna have to start from square one. test the fuel pressure to see if it is within specs. even a new pump can be bad. wouldnt hurt to have the injectors tested.
OK thanks my fuel pressure is 35 to 40 psi I will check injectors
Yes it has a chip on key its a v8 4.9liter
I check my manual and it suppose to be 45-50psi
mikeatpriestlake answered 9 years ago
ok low fuel pressure will definitely cause your car to do this. It could still be your pump even though it is new. it can also be the pressure regulator, but that is less common. if you can unhook the return line for the pressure regulator and the pressure comes up to spec, then the regulator is bad. or if you can remove the vac line and there is fuel in it the regulator is bad. You had a lot of work done too, and maybe somehow the fuel line got crimped or damaged that will cause low pressure.
OK I'm gonna check fuel lines because the regulator is new
My cadillac has good fuel pump ive changed all i could emagine but the fuel pump shuts off. And it wont start
