Question about 1993 Chevrolet Caprice

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Need to find where the fuel pressure regulator is on my car

The engine is getting too much gas and we need to try replacing the fuel pressure regulator. We are wondering if someone can tell us where this is located

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Most fuel pressure regulators are attached to the fuel rail which is generally attached to the intake manifold. To see a picture of the fuel rail and the fuel pressure regulator attached to the top view the link. Yours may be in a slightly different location on the rail. http://en.wikipedia.org/wiki/Fuel_rail

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

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SOURCE: fuel pressure regulator had no vacuum line connected

another engineers wet dream. think of it this way . what is normally in the intake when the engine is running.. answer vacume, hence the regulator gets its vacume without a hose connected to it as its already in a full time vacume chamber.no hose required . ps be carefull to seat the regulator and o rings securely into the housing befor you reattach the secureing metal clip.
good luck chris

Posted on Mar 23, 2009

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SOURCE: 1997 astro 4.3 vortec v6 fuel pressure problem.

have you made shure there is fuel in the tank, they had alot of problems wth sending units on that year. if so chances are its the fuel pump. try banging on the bottom of the fuel tank while sombody tries to start the vehicle, if it starts replace fuel pump. faulty regulators will usually cause a very rich running condition.

Posted on Sep 02, 2009

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SOURCE: where is the fuel pressure regulator on my chevy

HERE is a picture of the location. let me know if this help remember release pressure before removing regulatorb1a6d1d.jpg52c36aa.jpg

Posted on Sep 25, 2009

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Don't think it would be the fuel rail, as that is only a pipe to hold the gas and the injectors. So if you have low pressure, it is probably either the fuel pump or the fuel pressure regulator. Wouldn't cost much if anything to have the fuel pressure checked. I believe Autozone or O'reilly's will rent those fuel pressure gauges, with just a refundable deposit.
The pump is doing something since the engine is still running. If your pressure is too low (below the specs for your truck), a pressure regulator is cheaper than a pump, so you may have to try both, first the regulator.
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If the regulator is not leaking, check the fuel pressure. If low probably the pump, but maybe the pressure regulator. Ask the guys at autozone (or where you get the gauge to check pressure) how to test the regulator as you are checking the pressure.

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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.
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Removal & Installation

4.2L Engine

  1. Relieve the fuel system pressure.
  2. Remove the air cleaner outlet resonator.
  3. Disconnect the engine wiring harness from the retaining clips at the front of the engine.
  4. Disconnect the fuel pressure regulator vacuum line.
  5. Clean any dirt from the fuel pressure regulator and the surrounding area.
  6. Disconnect the fuel return pipe.
  7. Remove the fuel return pipe retainer.
  8. Remove the fuel pressure regulator retainer.
  9. Remove the fuel pressure regulator.
  10. Inspect the regulator filter screen for contamination. If contaminated, replace the fuel pressure regulator.

To install:
  1. Install the regulator filter.
  2. Install the new O-ring on the fuel pressure regulator.
  3. Lubricate the fuel pressure regulator O-ring with clean engine oil.
  4. Push the fuel pressure regulator into the regulator housing on the fuel rail.
  5. Install the fuel pressure regulator retainer. Tighten the regulator retainer screw to 71 inch lbs. (8 Nm).
  6. Install the fuel return pipe retainer. Tighten the return pipe retainer screw to 71 inch lbs. (8 Nm).
  7. Connect the fuel return pipe.
  8. Connect the fuel pressure regulator vacuum line.
  9. Connect the negative battery cable.
  10. Inspect for leaks:
    1. Turn ON the ignition for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition.
    4. Inspect for fuel leaks.

  11. Install the engine wiring harness into the retaining clips at the front of the engine.
  12. Install the air intake resonator.

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1 Answer

Starting car is problem. it will start after maybe two trys. i have tried engine cleaner, but still it is slow starting,. battery is good, thats been checked.


When you have an engine that is hard to start or the engine takes longer than normal to start, with a fuel injected engine it will normally be caused by a fuel problem. Another problem would be slow cranking of the engine because of a low battery, I would check all of the fuel related problems if the engine seems to crank normally. There are a few things to check. First pull the fuel filter off and wipe it off so you don't get gas in your mouth and try to blow through one of the fuel connections on the filter. If you can't blow through it the filter is pluged and needs to be replaced. A plugged fuel filter can cause hard starting and can also damage your fuel pump. The next thing to do when everything is put back on the car is to check the fuel system for bleed down. You need to locate the fuel pressure test connection on the engine. Connect a fuel pressure gauge to the connection and start the engine, then turn the ignition off. With the engine off the pressure should read and stay between 30psi and 40psi, to be sure of the pressure you will have get the spec's on the engine you have. The main thing you will be looking for is to make sure the pressure doesn't start bleeding down in to direction of zero after a few minutes or maybe even immediately. If you see the pressure start to bleed down you have a problem. There are two problems that normally cause the pressure to bleed down. One is a bad check valve in the fuel pump, the other is a bad fuel pressure regulator. The main thing that happens with a fuel pressure regulator is the diaphram inside starts leaking. When that happens sometimes it will leak fuel into the intake manifold through the vaccuum hose connection to the intake manifold. To check for a fuel leak through the vacuum hose connection, locate the vacuum hose on the fuel pressure regulator and pull the hose from either the manifold connection or from the connection at the fuel reguator. If you see any gas at all the fuel regulator is leaking and must be replaced. If it is a slow leak from the regulator you might have to start the engine with the vacuum hose disconnected and look for a leak from the hose. If you don't find anything wrong with the regulator the next problem area would be fuel pressure bleeding back into the gas tank because of a bad check valve in the fuel pump. If this is the problem the fuel pump would have to be replaced. My first guess as to what is causing your problem would be the fuel pressure regualtor although I would definately want to make sure the fuel filter is not plugged. (Please Note) The fuel pressure regulator is located in the intake manifold area of the engine. The fuel pump is located in the gas tank. The fuel filter is located usually somewhere under the car.

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Good chance that the fuel pressure regulator is leaking gas and needs to be replaced. The fuel pressure regulator is located at the base of the throttle body and when it's starts to leak when the engine is running, it starts to flood the engine causing it to run bad and rich in fuel. The other common thing that would cause this is a faulty EGR valve, due to carbon build up and will need to be cleaned or replaced.
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Good luck and keep me posted.

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