1998 gmc safari sle will not stay running

[cshaw1958]

i have a 1998 GMC Safari SLE.All of a sudden out of the blue it decided not to start.We replaced the battery,still wouldn't start.Had it towed to a local dealer.They replaced the fuel filter, plugs and plug wires.They noticed gas in the oil.They blew off the plugs and tried again this time fouling out the plugs.They replaced the plugs one more time.They did a diagnostic test and said the fuel pump is ok.This time it will start wbut it won't stay running.Any idea what it could be.

[cshaw1958]

Originally Posted by cshaw1958

i have a 1998 GMC Safari SLE.All of a sudden out of the blue it decided not to start.We replaced the battery,still wouldn't start.Had it towed to a local dealer.They replaced the fuel filter, plugs and plug wires.They noticed gas in the oil.They blew off the plugs and tried again this time fouling out the plugs.They replaced the plugs one more time.They did a diagnostic test and said the fuel pump is ok.This time it will start wbut it won't stay running.Any idea what it could be.

i just spoke with the repair shop and they said it seems to be flooding.

[old_master]

Fuel pump operation and fuel pressure testing

The fuel pump circuits are designed to energize the fuel pump continuously when the key is turned to the START position. When the key is turned to the RUN position the fuel pump will operate provided the engine is running. If the engine stalls, or is not running for any reason, the ECM will shut off the fuel pump after approximately 2 to 3 seconds.

Fuel pressure test:
Install fuel pressure gauge to the test port near the distributor. Turn the key to the RUN position, (do not start the engine). While the fuel pump is running, fuel pressure must be a MINIMUM of 60psi. After approximately 2 to 3 seconds, the fuel pump will shut off. Fuel pressure must remain above 55psi for several minutes. A drop in pressure below 55psi indicates a leak, most likely the fuel pressure regulator or lines under the upper intake manifold.