SOURCE: I dropped the fuel tank to drain old gas.I put new
Turn the key to the ON position without starting the engine. You should hear the fuel pump running for 5 seconds if working. This primes the gas to the injectors when doing this. If not heard running check the oil pressure switch for the 12 volts needed to run the fuel pump starts there on that harness. When the engine starts and the oil pressure reaches the normal pressure the computer shuts off that circuit and turns on the fuel pump relay to run the pump. The relay stays on till you shut the engine off
SOURCE: 2002 saturn sl2 twin cam.
probably the crank sensor, above the starter on the firewall side-no crank signal, no fuel pump activation.
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