Volvo RWD 140-160 Forum

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1975 164 Fuel Pressure test 140-160 1975

posted by  bigsteve on  Sun Jan 27 09:17 CST 2013
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last visit: Mon Feb 4 15:03 CST 2013
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Okay, I ran the fuel pressure test and the results were 28psi at idle and 22psi at around 3500-4000 rpm. You can see the pictures for your self here:

http://www.flickr.com/photos/88748529@N08/








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    1975 164 Fuel Pressure test 140-160 1975

    posted by  bigsteve on  Sat Feb 2 09:53 CST 2013
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    Ok,

    I wanted to let everyone know that I replaced the fuel pump with a an Airtex and it worked very nicely. Thanks for all your assistance.








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    1975 164 Fuel Pressure test 140-160 1975

    posted by  Chris Mullet on  Sun Jan 27 09:39 CST 2013
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    last visit: Fri Oct 24 09:08 CST 2014
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    If the fuel system is D-jet, the pressure should remain constant regardless of throttle load.

    If you have the mechanical system, I don't know anything about them.








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      1975 164 Fuel Pressure test 140-160 1975

      posted by  bigsteve on  Sun Jan 27 10:18 CST 2013
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      It is a D-jet and it is an electronic fuel injection system. I do not know what the pressure should be for this vehicle. I hoped someone in this forum could let me know. I have idle and acceleration issues. The car will not go forward. Decided to do the fuel pressure test and it is 28psi at idle and 22 at 3500 rpm.








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        1975 164 Fuel Pressure test 140-160 1975

        posted by  planetman on  Sun Jan 27 10:52 CST 2013
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        last visit: Fri Oct 24 09:29 CST 2014
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        Hello,

        28-32 psi is normal, but as stated earlier, it should not change, well at least not down to 22 psi.

        There are several things that can cause this like a clogged or collapsing in tank fuel filter, bad fuel pressure regulator and failing fuel pump.

        --
        Eric
        Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
        Torrance, CA 90502








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          1975 164 Fuel Pressure test 140-160 1975

          posted by  bigsteve on  Sun Jan 27 10:59 CST 2013
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          last visit: Mon Feb 4 15:03 CST 2013
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          Thanks. Here are the pictures of my readings...http://www.flickr.com/photos/88748529@N08/

          I am sort of certain it is not the in-tank fuel filter since while in park, I can easily rev the car over 4000 rpm without issue. If it was the filter, wouldn't it collapse even in park and give me fits? Questions: is there a way to check the in-tank filter, and how do I determine between the fuel pressure regulator and the fuel pump? I appreciate any assistance. Thanks.








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            1975 164 Fuel Pressure test 140-160 1975

            posted by  planetman on  Sun Jan 27 12:13 CST 2013
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            last visit: Fri Oct 24 09:29 CST 2014
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            Hello,

            The easiest thing to check is the fuel pressure regulator.

            But the test involves replacing your suspect regulator with a new 1 or a known good used 1.

            --
            Eric
            Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
            Torrance, CA 90502








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              1975 164 Fuel Pressure test 140-160 1975

              posted by  bigsteve on  Sun Jan 27 13:45 CST 2013
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              last visit: Mon Feb 4 15:03 CST 2013
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              I was able to adjust the psi to 31.3 or as close as I could get it...it could be 31.4 as far as I can tell. Anyway, it did help a bit with the idle and a wee bit on the acceleration, but the basically the problem remains.

              Since I was able to adjust the fuel pressure regulator, does it appear more likely the fuel pump is the culprit? I did check the contacts in the distributor and cleaned those.








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                1975 164 Fuel Pressure test 140-160 1975

                posted by  walrus3 on  Sun Jan 27 20:23 CST 2013
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                last visit: Mon Dec 2 14:20 CST 2013
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                Steve,
                If you can lay hands on another fuel pump I think it would probably solve most of your
                problem. An AirTex pump is not exactly a bolt-in but it does put up enough pressure
                and the mounting can be cobbled up to work well. It'll be a lot cheaper than a new or
                even rebuilt Bosch pump. NAPA or equivalent stores have or can order them.
                --
                George Downs Bartlesville, Oklahoma








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            1975 164 Fuel Pressure test 140-160 1975

            posted by  Chris Mullet on  Sun Jan 27 12:11 CST 2013
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            last visit: Fri Oct 24 09:08 CST 2014
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            "...I am sort of certain it is not the in-tank fuel filter since while in park, I can easily rev the car over 4000 rpm without issue...."

            Reving the engine while in neutral is not a very good test of the fuel system. If the engine isn't under an actual load it doesn't demand that much fuel. A better test is to connect up your pressure guage and tape it to your windshield so that you can monitor it under real driving conditions. Take the car out and throttle down real heavy up a grade. I bet you'll see the pressure drop WAY down. Since you were able to see a drop in pressure while while reving the car in neutral, my guess is that you have fuel system that is nearly completely clogged somewhere. Have you replaced the filter lately?








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    1975 164 Fuel Pressure test 140-160 1975

    posted by  Milanomike on  Sun Jan 27 09:30 CST 2013
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    last visit: Sat Oct 11 22:27 CST 2014
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    Don't have a 164, but I'll ask what should the fuel pressure be? Does not seem like it should go down as engine speed increases to me. Mike







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