Sundance L4-153 2.5L SOHC Turbo (1990)
Fuel Pressure Release: Service and Repair
The TBI fuel system is under a constant fuel pressure of approximately 100Kpa (15 psi). The Turbocharged fuel system is under a constant fuel pressure
of approximately 380Kpa (55 psi).
The 3.0L and 3.3L MPFI fuel system is under a constant fuel pressure of approximately 330Kpa (48 psi). Before servicing the fuel tank, fuel pump, fuel
lines, fuel filter or fuel components of the throttle body the fuel pressure must be released as follows.
1. Loosen fuel filler cap to release any residual pressure in the fuel tank.
2. Disconnect injector wiring harness from engine harness.
Injector Harness Connections
3. Connect a jumper wire to ground terminal Number 1 of the injector harness to engine ground.
4. Connect a jumper wire to the positive terminal Number 2 of the injector harness and touch battery positive post for no more than 5 seconds. This
releases system pressure.
5. Remove jumper wires.
6. Continue fuel system service.
