Make sure engine is turned off, unplug the hose slowly and make sure there is no fuel pressure, you will have a little bit of gas leak but not much. Unlossen the bolt with torx head bit screw driver or driver, pull it off all the way. Once you got that one bolt off, push down on the locking clip that attaches your fuel regulator to manifold. Twist off the old pressure regulator and then install the new one in. Make sure you check the box your regulator came in, and look for the packaged o-ring. Its that simple. I just replaced mine in my 2001 alero, took more time analyzing how to pull the old one off. Hope this will help you.
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Re: Fuel Pressure Regulator Leaking
Be sure to relieve fuel pressure first or it will spray all over. After removed, make sure to remove the very small O ring from inside the fuel rail. Many times this is overlooked and will cause problem during installation. Lube the new regulator's O rings lightly with silicone grease. Tech JK ----------------------------------------
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Check the pressure with a fuel pressure gauge connected to the test port on the regulator or on the fuel rail itself. There should be at least 30 psi on the rail with the engine running and the same without the engine running. If the pressure bleeds off when the engine is not running, the check valve in the regulator is leaking down which will make a first start in the morning difficult.
1994 Chevrolet S10 Blazer 4.3L, Vin W
DTC 45 The spark plugs are black on both banks. Right bank plugs are damp. Removed the tuning valve and looked inside the plenum. Can see a washed/clean area on the right side. Fuel pressure is good, it holds when the pump stops.
1. Remove the upper intake plenum cover and inspect for a fuel leak at the fuel pressure regulator.
2. Inspect the fuel pressure regulator and return lines and fittings at the left side of the plenum.
3 Replace the Central Multipoint Fuel Injection (CMFI) unit.
Leaking Fuel Line - One or more may have a problem. Leaking Fuel Pressure Regulator Tech Tips:
The fuel pressure regulator may only leak at a cold or hot engine, only with vacuum applied, or only without vacuum applied. The leaking at the fuel lines and fittings have as often been the result of repairs as the initial cause of the problem. Handle the lines and fittings carefully. The fuel pressure regulator is a integral part of the Central Multi-port Fuel Injection (CMFI) unit. Any failure requires entire unit replacement.
relieve fuel system pressure. on the v6, detach the fuel return line from the fuel pressure regulator. remove the mounting fasteners, and detach fuel regulator from rail. on the v6 install the fuel return line before tightening the regulator mounting screws. otherwise a leak could develop. be sure to replace all O-ring seals, and coat them with a lite coat of oil. have a good one !!
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.
usually caused by busted diaphram in fuel pressure regulator allowing fuel to be drawn thru regulator directly to intake manifold. Pull vacuum line off regulator, plug line with golf tee, start car and watch to see if gas comes out of regulator. If yes, turn off car, replace regulator. The regulator sits near the fuel rail on the top of the engine as shown below. I will paste replacement instructions below from autozone.com in case you need to replace the regulator. Please let me know if you have any questions.
Removal & Installation
Relieve the fuel system pressure.
Remove the air cleaner outlet resonator.
Disconnect the engine wiring harness from the retaining clips at the front of the engine.
Disconnect the fuel pressure regulator vacuum line.
Clean any dirt from the fuel pressure regulator and the surrounding area.
Disconnect the fuel return pipe.
Remove the fuel return pipe retainer.
Remove the fuel pressure regulator retainer.
Remove the fuel pressure regulator.
Inspect the regulator filter screen for contamination. If contaminated, replace the fuel pressure regulator.
Install the regulator filter.
Install the new O-ring on the fuel pressure regulator.
Lubricate the fuel pressure regulator O-ring with clean engine oil.
Push the fuel pressure regulator into the regulator housing on the fuel rail.
Install the fuel pressure regulator retainer. Tighten the regulator retainer screw to 71 inch lbs. (8 Nm).
Install the fuel return pipe retainer. Tighten the return pipe retainer screw to 71 inch lbs. (8 Nm).
Connect the fuel return pipe.
Connect the fuel pressure regulator vacuum line.
Connect the negative battery cable.
Inspect for leaks:
Turn ON the ignition for 2 seconds.
Turn OFF the ignition for 10 seconds.
Turn ON the ignition.
Inspect for fuel leaks.
Install the engine wiring harness into the retaining clips at the front of the engine.
Release fuel pressure by removing fuel pump relay and turning engine over to release pressure. Place a rag to catch any fuel under regulator Fuel pressure regulator has a locking clip pry clip off remove vacuum line pull regulator out with twisting motion,replace fuel pressure regulator install clip connect vacuum line install relay. Check for leaks,your done.
Yes, this is the fuel pressure regulator. Mine is doing the very same thing ( leaking ) and tomorrow I am off to the parts store to get another. I posted a question elsewhere here about if there was anything that I should know about replacing this unit and I am still awaiting a reply. I do know that places like Advance Auto sell this little unit for around $65. I have seen it cheaper online, but I wish to not wait any longer ( can anyone say fire hazard ? ) and replace this ASAP.