Fuel pressure with KOEO test

Discussion in '94-95 5.0 - Specific' started by gtptim2007, Apr 16, 2016.

  1. gtptim2007

    gtptim2007 New Member

    Messages:
    10
    Likes Received:
    0
    Joined:
    Apr 6, 2016
    Hey guys I installed a fuel pressure gauge and it's reading really low numbers. I read the specs for the KOEO pressure is 35-45psi but I see anywhere between the high to low teens. This is after shutting the engine off right after.
    I have 30psi with the car at idle but I'm seeing 2 different specs for it 35-45psi or 30-40psi and I'm not sure which spec is correct. This pressure is possibly from a pump with over 250K on the car. Will need some input on this? The engine is running a bit rough but runs good cruising around though just need some input on anything that will help.
    [​IMG]
     
  2. g36 monkey

    g36 monkey Moderator Staff SN95 Supporter

    Messages:
    14,057
    Likes Received:
    539
    Joined:
    Nov 15, 2008
    Location:
    Orlando, Fl
    See, the problem is you got gauges, so now you're worrying about what's wrong ;p

    lol I think [MENTION=17007]RichV[/MENTION] knows all these pressures off the top of his head, he would certainly know better than me, maybe he can help you out.
     
  3. RichV

    RichV Well-Known Member

    Messages:
    4,227
    Likes Received:
    247
    Joined:
    May 6, 2012
    Location:
    CO
    You're correct on the #s. Mine is bumped up to 42 with no vac at the FPR. At idle it's about 32. I have a manual gauge on the rail.

    I would check the gauge. Never heard of that brand and ebay cheapie gauges aren't known for their accuracy. Go buy a couple of plumbing fittings and check the reading against a known source like an air compressor, or if you know someone with a manual gauge borrow it for a day and check the reading. I also have a Valvoline fuel system cleaner with a built in gauge and adapters to various vehicles.
     
  4. 95GT86SS

    95GT86SS New Member

    Messages:
    86
    Likes Received:
    0
    Joined:
    Mar 18, 2016
    I Google Maxtow and it says it's a FP gauge for trucks. Electrical sending unit and such.

    95 GT BBK CAI TB MSD 6AL O/R H SLP LM1
    Coming soon GT40 Heads Intake and e303 cam with Long tubes
     
  5. ranger56528

    ranger56528 Active Member

    Messages:
    907
    Likes Received:
    0
    Joined:
    Aug 20, 2015
    Location:
    West central Mn
    KOEO I'm at 40 all day long at the rail gauge that's the one I trust,I have not adjusted it yet with the add on turbo doing that now at the shop so I can't give you running pressure yet.