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FUEL SYSTEM PRESSURE Fuel system pressure is regulated at the fuel rail or throttle body by a fuel pressure regulator. Refer to FUEL PUMP PRESSURE TEST—ALL EXCEPT WARNING: RELEASE FUEL SYSTEM PRESSURE SERVICING FLEXIBLE FUEL VEHICLES, WEAR METHANOL RESISTANT GLOVES AND EYE The specifications in the Fuel Pressure chart re- flect system pressure with the vacuum hose removed (1) Remove the vacuum hose from the pressure regulator before checking fuel pressure. (2) Release fuel system pressure. Refer to the Fuel System Pressure Release procedure in this section. (3) Connect Fuel Pressure Gauge C-4799 to service port on fuel rail (Fig. 6). CAUTION: When using the ASD Fuel System Test, (4) Place the ignition key in the ON position. Us- ing the DRBII scan tool, access ASD Fuel System If the gauge reads the specification listed in the Fuel System Pressure chart, further testing is not re- If pressure is below specifications, proceed to Fuel System Pressure Below Specifications . If pres- Fuel System Pressure Below Specifications specifications, test the system according to the fol- WARNING: RELEASE FUEL SYSTEM PRESSURE (a) Perform Fuel Pressure Release procedure. Pressure Test Adapter 6539 in the fuel supply line (c) Using the DRBII scan tool, with the ignition key in the ON position, repeat the ASD Fuel Sys- Fig. 5 Fuel Pump—Typical FUEL SYSTEM PRESSURE Fig. 6 Fuel Pressure Testing—Engines With Service Ports 14 - 6 FUEL SYSTEMS Ä |