Check for a bad connection to relay. relays shouldnt just go bad after you keep replacing them seems like it would be a bad connection for the relay and when you replace it you move the connection in the fuse panel. find wireing scehmatic just jump the power for the fuel pump directly to power and see if it works if so examine that you have power from the ignition switch and a ground to energize relay and that power is good on feed side of relay.
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Could be the relay or something else.
The relay powers the pump for 3 seconds on crank then the engine computer must see RPM or oil pressure for the relay to keep sending power to the pump.
You could bypass the relay to check the pump operation.
The relay is grounded / controlled by the engine computer.
If the pump continued to run after shutting off the car you fuel pump relay was probably staying latched. I would replace the relay as well based on your info. Along with the pump the fuel filter should be replaced too and fuel pressure should be checked. Make sure your ground is good also.
Lets start at the beginning. The engine computer grounds the pump relay. The relay gets power from the EFI relay when the key switch is on and from the starter fuse when the key switch is in the start position. Do you know if the pump relay is getting power from both sources and a ground from the computer ? Can you run a hot wire to the blue black wire going to the pump and keep it running ?
Has the car been running one day and won't start the next and thats why you replaced those parts? This may be the distributor ignition modual later then when it is going out can act like its got demon in it. This modualator will shut power down to your fuel pump.
Now you can try something first though. Run a wire from a hot wire to the fuel pump and see if it will start and run while that wire is hooked up.
If it does then you can find a wire that only becomes hot when the key is turned on so the pump won't run all the time and only when the car is running. This is called gerry riggen in the service and not the proper way to do it. You may get an engine line on because of it too which will put the computer into trouble mode and cut your power down. But maybe not. Try it and see what takes place. If it still won't start then we need to look into testing the ignition modualator. Keep me informed and I will be glad to help you in the matter as well. Raz
It could be a relay that keeps the fuel pump running when the ignition switch is in the run position. My jeep had this problem, where the pump gets power in the start position but once the key returns to run, the engine shortly stops running because the pressure in the fuel line drops off as it is used by the running engine, it usually died within 3 seconds. my relay was under hood and there were several of the same type in there, I switched the fuel system one with the one for my AC(which only blows hot anyway) Hope this helps...
In reply: if its not the maf there are 2 relays in the relay box i belive its underhood, 1 primes the fuelline to 32psi the second kicks in after it starts, and keeps it running and varies the psi. if the primer relay isnt kicking in then it wont start due to no fuel