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Chevy burb 2005 fuel pressure drops in rail after vehicle sits for awhile... where is the Presurre Regulator?

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The pressure regulator is located on the left side; driver side common rail -- however, that is most likely not your problem. You either have a bad check valve in the fuel pump inside the fuel tank or you have a fuel injector staying open...and leaking fuel pressure. The regulator only works when the vehicle is running.

Posted on Aug 02, 2009

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2005 chevy silverado 1500. Just on first start or if sits for a few hours engine will bog down. When using auto start takes a few tries


Possible fuel pump issue causing fuel to drain back into the tank. Check valve inside pump may be bad. Once vehicle is turned on it may take a few seconds to prime up the fuel lines until operating pressure is reached. Put a pressure guage on the fuel rail and start the vehicle. Should be approx 55-60lbs running. Turn off vehicle and leave it sit with guage attached and monitor for pressure dropping off to 0. If so, suspect a bad pump

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I need to replace de fuel presurre sensor in a pontiac montana ,do i have to just replace the sensor ,o the sensor came with the fuel pump?thank you


Replacing the fuel pressure regulator, involves just replacing the regulator at the end of the fuel rail in the engine compartment, but fuel pressure sensor - does this mini-van have a fuel pressure sensor?
replacing the fuel pressure regulator: (1) locate it at the end of the fuel rail in the engine compartment,
(2) relieve fuel system pressure (3) disconnect fuel pressure regulator vacuum line. (4) remove fuel pressure regulator retaining screw (retain for re-use (5) using a shop towel to catch spilled fuel, lift & twist Fuel pressure regulator to remove it from the fuel rail. (6) remove/discard retainer and spacer bracket from the fuel rail. (7) remove fuel pressure regulator from the engine fuel return pipe. (8) remove/discard Fuel Pressure Regulator inlet O-ring (9) Check Fuel Pressure Regulator filter screen for contamination - if contaminated, replace Fuel Pressure Regulator. (10) Lubricate new Fuel Pressure Regulator inlet O-ring with clean engine oil & install onto the Fuel Pressure Regulator inlet. (11) Install the fuel return pipe onto the Fuel Pressure regulator (12) Install new retainer & spacer bracket into the slot on the fuel rail.
(13) Install Fuel Pressure Regulator onto Fuel Rail & tighten Engine Fuel Return Pipe nut to 13 ft-lbs (17 Nm). (14) connect Fuel Pressure Regulator vacuum line, (15) Install Fuel Pressure Regulator attachng screw & tighten to 76 in-lbs (8.5 Nm). (16) Inspect & verify that retainer & spacer bracket is engaged in the slots on the fuel rail. Grasp & pull on the Fuel Pressure Regulator.
to ensure that the Fuel Pressure Regulator is properly seated. (17) inspect for fuel leaks with this
procedure: On 2sec,(holy rollers), off 10sec will be left on, inspect for leaks while running.

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1 Answer

I Have a 87 corvette that drops fuel pressure if left unstarted for more than a day or two.


Fuel Pressure Regulator REMOVAL & INSTALLATION 5.7L (VIN 8) Engine NOTE: The pressure regulator and base are factory adjusted and serviced as a complete assembly only. Do not try to remove the regulator cover. 1985-88 VEHICLES
  1. Disconnect the negative battery cable.
  2. Properly relieve the fuel system pressure.
  3. Remove the fuel rail from the vehicle, as outlined earlier in this section.
  4. Remove the front crossover tube retaining attaching screw and crossover tube retainer from the right hand rail side.
  5. Unfasten the retainer-to-base screw assembly and rear crossover tube retaining from the pressure regulator and base assembly.
  6. Separate the left hand fuel rail and plug assembly from the right hand fuel rail and plug assembly.
  7. Remove the bracket-to-rail attaching screw, 2 bracket-to-base screws and the regulator and base bracket.
  8. Unfasten the screw that attaches the fuel outlet tube to the right hand rail.
  9. Remove the base-to-right hand rail assembly. Fig. 1: Typical fuel pressure regulator assembly - 5.7L (VIN 8) engine 91035g26.gif

  10. Twist the regulator and base assembly to the remove it from the fuel outlet tube.
  11. Unplug the base-to-rail connector.
  12. Remove and discard the O-ring seals from the following components, noting the location and sizes of the O-rings to ensure proper placement during installation:
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    • Fuel outlet tube
    • Rear crossover tube
    • Front crossover tube
  13. Check the O-rings and sealing surfaces for damage that may prevent proper sealing.
  14. Installation is the reverse of the removal procedure. Tighten the retaining screws to 44 inch lbs. (5 Nm).
  15. Connect the negative battery cable, then turn the ignition to the ON position and check for fuel leaks.

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Have troble starting engine after letting seat for a while with unit hot have change fuel regulator next to intake and change out body trodel position sensor


You need to check fuel pressure with a fuel pressure gauge. The regulator is a good guess but the fuel pump can also be letting fuel pressure drop. Once fuel pressure drops on a hot engine the fuel in the fuel rail will boil and essentially be a vapor lock condition. Fuel pressure should be around 56 psi and hold steady for at least 45 minute to an hour. If it drops within a couple of minutes to check valve in the pump is probably bad and the fuel pump module will need to be replaced.

The other thing, when you replaced the fuel pressure regulotar is is possible that you did not get all the old pieces from the old regulator out of the fuel rail. It is common for the screen and o-ring from the old regulator to stay in the fuel rail and they need to be removed carefully with a small pick.

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