W 350 Pickup V8-5.9L VIN Z (1990)
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Fuel Pressure Release: Service and Repair
Injector Harness Connector
1.
Loosen fuel tank filler cap to relieve fuel tank pressure.
2.
Disconnect injector wiring harness at connector and connect a jumper wire from terminal #1 of the injector harness to ground.
3.
Connect a second jumper wire to terminal #2, and touch the battery positive post for no more than 5 seconds. System pressure is now released.