Question about 1998 GMC Jimmy

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Need step by step inst. to replace fuel pressure reg.

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  • GMC Master
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  1. First, you will need to depressurize your fuel system. Remove the Fuel Pump Relay, start the vehicle and run until it shuts off, should only take a few seconds.
  2. The Fuel Pressure Regulator is held in place on the Fuel Rail using a Retaining Ring, or Snap Ring.
  3. You will need to remove the Vacuum Hose connected to the Fuel Pressure Regulator before you remove the retaining ring.
  4. You need a pair of Snap Ring Pliers to remove this retaining ring.
  5. Once the retaining ring is removed, slide the old Fuel Pressure Regulator out, and install the new one. Lubricate the O rings on the new part and the fuel line before assembly.
  6. After reinserting the Snap Ring, ensure that it is snapped in place completely.
  7. Reinstall the Vacuum hose and reconnect your Fuel Pump Relay. Turn the Ignition to On, and check for leaks around the Fuel Pressure Regulator.
  8. If no leaks are found, proceed to start the vehicle.

Posted on Mar 15, 2011

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1 Answer

I've replaced the map sensor and for some reason now the fuel rail builds up pressure, and then it stalls out and backfires. what could be the problem?


the fuel rail always does that. that is its #1 job. to hold a steady pressure (until vacuum drops)
that is the job of the fuel pressure regulator.
i see you work with no tools? or gauges? the fuel pressure test is first.
not the map , the map, is like a rock, lasts near for ever.
but not any PFreg.
the FSM covers the reg tests.
i do these , (PSI spec tests) (by the book below and ASE books)
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https://www.techauthority.com/en-US/Pages/Home.aspx

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