Change fuel pump and relay. the pump starts for at least a second when you turn the key for the first time. if you turn the key again the pump will not start and will not build pressure. if you wait several minutes and take the key of the ignition it will sart again for a second or two and you will have to start all over again because it still has no pressure. the car starts with starting fluid
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OK, when you turn the key to on, it will start the pump for about 2 seconds-this is just to put pressure in the lines and in the fuel rail for easy starting. If key is not turned to start, pump will shut off after 2 seconds. But when cranking in start, and when engine is running, the pump is on full time.
If your pump runs longer than 2 seconds with key only in on position, you have a fuel circuit problem. It very well could be a bad fuel pump relay staying on. Or it could be a computer problem signaling the relay to stay on longer. Try a new fuel pump relay first and see if that was the problem.
This is common, the pump will run for 3 seconds when key is turned to the "on" position to prime the fuel system, then it will be turned on by the ECU when the engine is started by a signal from the crank sensor.
I'd have to test when problem is ongoing. When you first turn on key, no crank, you should hear the pump run for a few seconds then stop. For initial prime, the computer doesn't need rpm signal. Engine cranking, the computer needs to see rpm signal or it won't ground the fuel pump relay. W/o rpm signal, no spark at the plugs and no fuel injector pulse. I know your talking about fuel, but, when problem is ongoing, check spark and fuel injector pulse, engine cranking.
Intermittent problems are a pain, have to test when problem is ongoing.
fuel pump may be going. try this. turn key on, listen for fuel pump to run for 5 seconds. Turn key off, wait 15 seconds or until you hear relay click inside car. Turn key on again for 5 seconds and ff for 15 seconds. repeat once more. This will pressurize fuel system to 40 psi so injectors have full pressure. If it starts quickly now, you are getting bleed down through the check valve in the fuel pump or the fuel pressure regulator on the fuel rail.
The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.
I think you have a faling fuel pump or a bad pressure regulator allowing fuel pressure to bleed down when the engine is off.
Try this test - When you start the car for the first time of the day, turn the key to "ON", wait a few seconds, turn the key off. Wait about 15 seconds, turn the key to "ON" again, wait a few seconds. Then wait one final time for 1 seconds and try starting the car. If it starts right away, that means fule pressure is bleeding of due to a bad check vavle int he fuel pump, a bad fuel pump or a bad pressure regulator.
The reason for the procedure is because when you turn the key to "ON", the fuel pump runs for 2 seconds and then shuts off if the engine is not running. The 15 seconds wait is for the power and fuel pump relay to cycle off before it will run the pump again.
Let us know how the test comes out. The fuel pump is in the fuel tank and hums when it is running.
Well when you turn the keys on the pump will only run for a few seconds A test light works ok but i would use a volt meeter at th efuel pump power and groung wires and measure the voltage while cranking the car
I assume you bled off fuel pressure before you installed the injectors. Try this to pressurize the fuel system. Turn the key to "on" position and wait 5 seconds. AT same time, listen carefully for a buzz sound that means the fuel pump is running to pressurize the system. It will shut off after 5 seconds. Then, turn off the key and wait 30 seconds for the computer power relay to shut off. Then, turn the key to "on" again. Thsi will run the fuel pump for another 5 seconds. Repeat 5 times. Fuel system should be pressurized now.
If it doesn't start now, you may have done something while you were changing the injector. good luck