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Old 03-01-2021, 03:31 PM   #7
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: L200 2002 won't stay on running

In one moment, the engine starts up (fuel/injectors and ignition/spark) are operating until two seconds pass when the engine dies. Fuel and spark are occurring during each brief startup. While this may appear as a possible security issue (security should be flashing its led unless the led was damaged), there are some things to check a la old school ways.

Connecting a fuel pressure gauge will display when fuel pump and pressure develop, lower than ideal values, a sudden drop of pressure at any time or pressure bleeding off. Under normal circumstances, fuel pump operation turns on when ignition is turned on. Pressure should be around 45 psi immediately. If the engine isn't started in a few sections the pump will shut off (safety). Pressure should remain high for a few minutes before bleeding down. If the engine is started, pressure should remain high. Whether the engine is manually shut down or stops on its own, fuel pressure should remain high. When the engine shuts down on its own after two seconds, what's fuel pressure?
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