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Make sure the black wire from the relay socket is well grounded. Then check the voltage on the red wire with the key on. If the voltage is less than battery voltage or is intermittent, suspect the ignition switch. If both of those are good, the pcm may be shutting off the pump. Is the engine light on?
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.
A double whammy, eh? a loose connection could cause both conditions (intermittent pump, then stalling). Address the intermittent pump operation first: Pull off the connector at the pump and thoroughly check it's condition and the wires in it. Look for loose terminals, melted plastic or wire insulation, anything that might cause loss of good connection. You may have to look for other connectors going back to the fuel pump relay (probably in the fusebox near the battery, but may be elsewhere around the engine). Possible you may have a faulty relay. Also possible that your pump is on its last legs, starting to fail. Good luck.
Several things to check: 1. Battery voltage 2. Fuel pressure and/or fuel pump 3. Disconnect battery for 20 minutes and then reconnect to reset computer.
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