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Wont start. if I njump the fuel pump relay the fuel pump kicks on and builds fuel pressure. but with the relay in and I crANK IT OVER THE PUMP DONT WORK
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Do you have a check engine light, what is the code. Do You have fuel pressure. You changed the fuel pump but is your fuse and relay good to the fuel pump. When you turn the key on do you hear the fuel pump kick on. It should come on as soon as you turn the key on, not just when you try to crank it. If you have a code it would help.
I would suspect the problem is the fuel pump. It is located inside the fuel tank. Next time this happens have a spray can of starting fluid with you, spray it into the air intake of the engine and see if it starts right up, if it does you likely need to replace the fuel pump.
Pumping the gas pedal on a fuel injected car doesn't really do anything.
However, cranking the engine for an extended period of time could "pump up" the fuel pressure.
You should have about 35psi in the fuel line when you first crank the engine. If the pressure is low, it could take 30-60 seconds to build up that pressure to get the engine to start. Min pressure is around 35-40psi. The pump in the tank could be leaking pressure back into the tank overnight, or the pump relay could be faulty.
there is no fuel pump cut off switch . put a fuel pressure gauge on the fuel rail schrader valve turn key on you should have 40+ pounds of pressure if you dont the pump is not working open the relay center under the hood swap the fuel pump relay with the wiper relay and try again if no pressure its not the relay its the fuel pump if you do have fuel pressure that means the relay was bad get a new one the car should start if you do have pressure and the car wont start the injector circuit is dead and what causes this is the crank sensor located on top of transmission bellhousing on driver side auto parts store 38.00 dealer 170.00 when you change it make sure to push it in and hold it while you tighten the bolt hope this helps and please dont forget to rate my solution
The fuel pressure check valve in the electric fuel pump has failed, you will have to replace the fuel pump, it is in the gas tank, also replace the filter at the same time or the warranty on the new pump will be voided.
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