Question about 2006 Ford F-250 Super Duty

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Engine starts but stops immediately. I have replaced fuel filters still same problem. Could it be fuel pressure regulator

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If your engine is gas, not diesel, then it sounds as though your main injector is failing. It runs for a few seconds after starting because the cold start injector has just fed fuel whereas the run injector is "supposed" to take over, and doesn't.If your engine is diesel you may need to clean your glowplugs and have the injector timing checked. Thank you, Dana

Posted on Oct 07, 2009

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1997 Ford F-150 4.2 V6 boggs down going up hill and stepping on gas.


Check or replace fuel filter again. You could have had a lot of sediment in your tank. If it ran good for a week, that's where you need to start figuring out what was replaced during that time. If you can, check fuel pressure at schraeder valve on fuel rail.

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Overreving with no power and excessive gas consumption air filter cleaned map sensor replaced fuel pump and filter


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.

Dec 08, 2010 | 2002 Chevrolet TrailBlazer

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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Where is the fuel relay located in Mazda mx6 1988?


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Feb 08, 2010 | 1988 Mazda MX-6

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Engine will not fire immediately when key engaged unless accelerater pumped prior to key engagment, already changed fuel filter twice


Sounds like the fuel pressure regulator is allowing the fuel pressure to bleed down. While sitting (key off) it should hold about 30 psi of fuel pressure to keep the system primed. When it bleeds down it causes an extended start, you sometimes have to cycle the key a couple of time before it will start. If this is the case then replace fuel pressure regulator. FYI pumping the accelerator on a fuel injected vehicle does not prime the system.

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95 2.5 jeep wrangler stalls consistantly and will restart after 20-30 minutes. i've replaced fuel filter and fuel pressure regulator, cleaned cam and crankcase position sensors, checked fuel line and...


I had the same issue with my 4.0, I went through all the same BS you did and in the end it was a faulty fuel pump. Pricy i know but im sure thats your problem

Nov 15, 2009 | 1995 Jeep Wrangler

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CAR WONT START


If the car fired after pouring gas into the engine, then you should check your fuel pump, listen when you turn on the key, if you hear the fuel pump start and stop, then check your fuel pressure, all fuel injected vehicles have fuel pressure regulators, if your fuel pump isnt pushing enough pressure to the regulator the car will not start, and if it does start it wont operate properly, and may even leave you stranded.. If your fuel pressure is low, check the fuel filter, dirty filters restrict pressure, and are ALOT cheeper to replace than a fuel pump!

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