Question about 1986 Ford Bronco II

2 Answers

Hi, how do I test the fuel pressure regulator to see if it is working properly on my 86 bronco ll

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  • sgrady64 Jul 17, 2010

    i need to know how to check the returnline in a ford bronco ll

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2 Answers

hi, how do I test the fuel pressure regulator to - 8152471.jpg
You will need to get a fuel pressure gauge and connect it to the fuel system test port (looks like a tire valve stem) with the engine off. This gauge screws clockwise onto the port. Now turn the key on (don't start vehicle) and watch the gauge to see the needle jump up to your system pressure. Now start the engine and the fuel system pressure should stay the same. While watching the gauge snap open the throttle, the fuel system pressure should jump up about five psi. If the system fuel pressure does not respond then your fuel pressure regulator has failed. If the fuel pressure gauge falls then the fuel filter is plugged or the fuel pump is failing

Posted on Jul 17, 2010

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  • Ford Master
  • 6,927 Answers

You really need a hand help vacuum pump to put on the fuel regulator,and pump it up,and have a fuel pressure gauge to look at as you do this,and watch it rise ,or fall.If the fuel pressure regulator holds vacuum,most of the time they are ok,what is the engine doing?

Posted on Jul 17, 2010

  • 5 more comments 
  • sgrady64 Jul 17, 2010

    Its getting to much fuel at idel wont pass smog ..to much hydrocarbens

  • sgrady64 Jul 17, 2010

    hello are you there??

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 17, 2010

    It will most likely be that,or the return line to the fuel tank is restricted.

  • sgrady64 Jul 17, 2010

    how do i check that??

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 17, 2010

    You need to monitor the fuel pressure and use a vacuum pump to pull vacuum on fuel regulator to watch fuel pressure drop,or fall.

  • sgrady64 Jul 17, 2010

    how do you check the return line??

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 17, 2010

    With removal from the fuel rail,and remove the fuel cap,and blow compressed air threw the line to the fuel tank,if it will not blow threw the line to the tank it is restricted,,,please rate if this is at all helpful,thank you.

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Posted on Jan 02, 2017

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