Fuel Pressure Issue
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Thread: Fuel Pressure Issue

  1. #1
    Join Date
    Jun 2008
    Location
    Baytown, TX
    Age
    69
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    164

    Fuel Pressure Issue

    Last night, I installed a new Holley carburetor on my 67.
    The fuel line kit came with a fuel pressure gauge so I installed it along with the other things.
    The car fired up and ran beautifully.
    I noted the fuel pressure was 5 psi at startup.
    I had the engine running about 20-25 minutes, just checking things over.
    While I was doing this, I noticed the fuel pressure gauge was showing 4 psi, then 3 and finally 2 psi before I shut the car off.
    During that time, the engine was running very well, no sign of insufficient fuel to the carb.
    The fuel pump is about 3 mnths old.
    My first thought was the gauge was wrong, but I'm not able to verify that unless I buy another gauge and swap it out.
    Any ideas??

  2. #2
    Join Date
    Sep 2013
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    Re: Fuel Pressure Issue

    Remove your gas cap and try it again ..

  3. #3
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    Jun 2008
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    Baytown, TX
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    Re: Fuel Pressure Issue

    Yeah, I wondered about that gas cap part after I thought about the problem some more.
    I'll try that and see what happens when I have some time to mess with it again.

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  5. #4
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    Jun 2008
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    Baytown, TX
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    Re: Fuel Pressure Issue

    Okay, I got some time to fool with the Cougar yesterday.
    Same thing happens.
    As the engine warms up, the fuel pressure drops off, settling around 2 psi.
    Removed the gas cap: Same result, or, rather, no change.
    The car runs great so I'm not really sure the gauge is right.
    For now, I'm just gonna keep an eye on it and maybe get a new gauge.

  6. #5
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    Re: Fuel Pressure Issue

    is you idle RPM staying the same ?

  7. #6
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    Re: Fuel Pressure Issue

    Yep, idle is good, throttle response is good.
    Just low reading on the gauge, gas cap on or off.

  8. #7
    Join Date
    Mar 2002
    Location
    Dallas, Tx
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    Re: Fuel Pressure Issue

    I think 2PSI hot is probably normal with a stock fuel pump. It's also probably plenty.
    Royce Peterson
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  9. #8
    Join Date
    May 2015
    Location
    Houston, TX
    Posts
    19

    Re: Fuel Pressure Issue

    The real test is sustained full throttle acceleration. If it keeps the fuel bowl full enough for that you're set.
    Houston TX
    1970 Cougar XR7 Hardtop 351C-4V, FMX, PW, PB, PS, AC, Styled Steel Wheels, Vinyl Top - Bought April 2015
    RIP - 1970 Cougar Std. 351C-2V, FMX, PS, AC, Vinyl Top, retro fitted PB - new to 1983

  10. #9
    Join Date
    Jun 2008
    Location
    Baytown, TX
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    Re: Fuel Pressure Issue

    Thanks for the input, Royce. It seems to run at about 2 to 2 1/2 PSI warm.

    With regard to full throttle operation, while I was working on the new carb setup, I noticed that I can't get full WOT.
    It looks to me like the accelerator arm just doesn't have enough travel to get the carb wide open.
    Since I very seldom drive the car that way, I guess I've never noticed it.
    I've tried some variations of linkage, but they just don't work out.
    If the linkage is made short enough to get the carb to WOT, then it won't get back to idle.
    I really don't want to worry with installing a Lokar linkage or anything like that,
    but I would like to know I could get full throttle operation if I needed it.
    Any ideas, anyone??

  11. #10
    Join Date
    Jun 2008
    Location
    Baytown, TX
    Age
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    Posts
    164

    Re: Fuel Pressure Issue

    With regard to the linkage issue, I ordered a new linkage set from West Coast Classic Cougars.
    Looking at my current setup, it looks like maybe the original rod was cut a little bit and a different connector was used.
    I think the new linkage rod may be a little longer and let me use a different hole in the carb throttle arm.

  12. #11
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    Re: Fuel Pressure Issue

    FYI the through the firewall throttle peddle linkage is bendable ..

  13. #12
    Join Date
    Jun 2008
    Location
    Baytown, TX
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    Re: Fuel Pressure Issue

    I guess things with this old Cougar are piling on.
    Yesterday, I went to take the car out for a drive, just because it was such a beautiful Texas day.
    The freakin' starter is bad now.
    I'm getting too old for this constant working on these old cars!!

  14. #13
    Join Date
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    Posts
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    Re: Fuel Pressure Issue

    That Texas heat getting to you ?

  15. #14
    Join Date
    Jun 2008
    Location
    Baytown, TX
    Age
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    Posts
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    Re: Fuel Pressure Issue

    I guess so. Here in the Houston Bay area, the heat and humidity gets really tough on us old folks.
    And, with some health issues from Agent Orange exposure (Thanks, Uncle Sam!!), it just gets harder and harder to crawl around in and under these things.
    Between the Cougar, the 66 Chrysler 300 and the 64 El Camino, my plate is pretty full.
    I hardly have time to ride the Harley!!

  16. #15
    Join Date
    May 2015
    Location
    Houston, TX
    Posts
    19

    Re: Fuel Pressure Issue

    WIJR1949, I see you are in Baytown. We've got a Houston area Cougar club now. We're Southeast Texas Cats Mercury Cougar Club. If you're interested in being on the mailing list send me an email at [email protected]. Same for any one else that is interested.
    Houston TX
    1970 Cougar XR7 Hardtop 351C-4V, FMX, PW, PB, PS, AC, Styled Steel Wheels, Vinyl Top - Bought April 2015
    RIP - 1970 Cougar Std. 351C-2V, FMX, PS, AC, Vinyl Top, retro fitted PB - new to 1983

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