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Thread: Strange fuel pressure gauge reading

  1. #21
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Strange fuel pressure gauge reading

    It's an accufab fpr. Upon thinking about it, if the diaphragm were damaged it wouldn't adjust like it does. Also it would probably leak fuel out of the adjusting screw .
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  2. #22
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Strange fuel pressure gauge reading

    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  3. #23
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Strange fuel pressure gauge reading

    Quote Originally Posted by jeff1234 View Post
    It's an accufab fpr. Upon thinking about it, if the diaphragm were damaged it wouldn't adjust like it does. Also it would probably leak fuel out of the adjusting screw .
    Ok, then perform the procedure Cordes described, and set to 55psi with the hose off.
    Once set, it should be around the value we mentioned at idle.

    From what you described, it sounds like you set it with the hose on and car at idle. That would result in your observed readings.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
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  4. #24

    Re: Strange fuel pressure gauge reading

    Good stuff and Wayne is right. Adjust the Accufab without vacuum to 55 and test. Looking forward to seeing the outcome of the testing and resolution.
    [SIZE="3"] [B]Jon Trotter[/B][/SIZE] [B]1985[/B] Dodge Shelby Charger, Currently decommissioned [B]1987[/B] Shelby GLHS, #937 [B]1987[/B] Shelby Lancer, #628 [QUOTE=Reeves;587010]I can be ready. Please send pics of wife. _____DodgeZ add comments here______[/QUOTE]

  5. #25
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: Strange fuel pressure gauge reading

    So, this morning before work I checked this thing out again. Here are the results!
    With the hose off and the tap plugged, the mechanical gauge reads 55 psi.
    With the hose on the mechanical gauge reads 46.5 psi.
    With the hose off and the tap plugged the cabin gauge reads 60 psi.
    With the hose on the cabin gauge reads 56.5 psi.
    Conclusion is the cabin gauge is a POS. and it looks as though i would need a gauge reading of 70+ psi at 10 pounds of boost.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  6. #26
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Strange fuel pressure gauge reading

    Sounds like we got to the root cause. Faulty or inaccurate electric gauge.
    Glad you got to the bottom of it. Bad instruments can really mess you up by making you think you have problems.
    I use a SpeedHut electronic fuel pressure gauge, one of their Revolution Digital gauges. The pressure transducer looks higher quality than I've seen with some other gauge kits.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  7. #27
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Strange fuel pressure gauge reading

    I have heard that Glow Shift gauges are cheap POS's. Get a quality name brand gauge.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

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