HF6 - Check Fuel Pressure

*** THIS ARTICLE REFLECTS CHANGES MADE BY TSB # 9326B7, December 1993

WARNING: THE FUEL SYSTEM WILL REMAIN PRESSURIZED WHEN THE ENGINE IS NOT RUNNING. TO PREVENT INJURY OR FIRE, USE CAUTION WHEN WORKING ON THE FUEL SYSTEM.

NOTE: Fuel pressures above specification may produce an abnormally rich air/fuel mixture. The rich air/fuel mixture may cause higher than normal catalyst operating temperatures.

- Key Off.

- Inspect the vacuum hose going to the fuel pressure regulator for proper installation, cracks, etc. Service as necessary.

- install fuel pressure gauge.

- Verify vacuum source to fuel pressure regulator.

- Start and run the engine at idle. Record the fuel pressure.

- Increase engine speed to 2500 rpm and maintain for one minute. Record the fuel pressure.

- Is the fuel pressure between 30 and 40 psi (210-310 kPa)?

YES -- Fuel pressure is OK. REMOVE the fuel pressure gauge. GO to HF7. HF7 - Check For Obvious Leak Sources In the Exhaust System

NO -- Fuel pressure is out of specification. REFER to Pinpoint Test Step HC1, Fuel Delivery Systems for diagnosis. HC1 - Check System Integrity

COMPLETE the PCM reset to clear all DTCs. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes