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Thread: High Fuel PSI

  1. #31
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,676

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    Contact Holley Tech Service (LINK) for a warranty replacement fuel pressure regulator. I'd first inspect the fuel pressure regulator (LINK) to ensure it isn't clogged with debris.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 MT tires.

  2. #32

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    Hey all. Just throwing in my 2 cents. I ran one supply feed, capped fuel return regulator on Sniper EFI and used the following filter/regulator: https://www.holley.com/products/fuel...s/parts/12-875 mounted by my gas tank. This way my return line is only a foot long, and don't have to deal with a long return line and potential issues with fuel regulator. Hope this helps!

    Click image for larger version. 

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    Last edited by Micribs; 04-28-2017 at 02:28 PM.

  3. #33
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,676

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    Yeah, we discussed it HERE.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 MT tires.

  4. #34

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    Just thought I would pipe in here. My car was running good just had some strange intermittent idle issues. I checked fuel pressure and found it at 95 psi. Called Holley, and they said they are having a lot of this issue lately, and told me they would have a new regulator in the mail to me today. He did ask me the color of the EFI body, so I'm not sure if I'm just getting a regulator kit or a cover also. I will update this post after I receive package. They did NOT ask me to email them a copy of my receipt, although I had it ready to send. I took delivery of my Sniper unit in Early March, not sure if that correlates with the other regulator issues I have read in the forum.

  5. #35

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    So it seems advisable to have a fuel pressure test gauge. It's probably a good tool to have in the garage. A reasonably priced tool will pay for itself with just one use. On Summit there is a cheap: Actron Professional Fuel Pressure Tester Kit. Would this be acceptable? In the kit there is a dual manifold test adapter that clamps onto fuel hose. This gave me the idea that there must be a reliable Schrader fitting that can be permanently mounted on 3/8" fuel hose. I assume the fuel pressure can be tested just after the 10 micron fuel filter near the tank. I know the pressure gauge can be used under the hood, but then I'd have a gas mess under the Air-Gap manifold. I'm trying to build a well thought out fuel injection system that's easy to service without scratching my arms or spilling fuel.

  6. #36

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    They sent me a new regulator cover with my new regulator, but that may be because I had mentioned a thread on here about the covers being an issue. The new cover is identical to the old cover AKAIK, but it did not include the rubber regulator tension button. And had no directions to transfer the old rubber part, but in my case I don't care, the regulator is no longer in my Sniper. I went with a divorced FPR setup.

  7. #37
    Join Date
    Aug 2012
    Location
    Dayton, OH
    Posts
    311

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    This is making me nervous. I'm installing a Sniper EFI system tomorrow and just installed a new Aeromotive 340 pump in the guy's tank today. He's not going to be happy if he has to buy an external FPR too.
    93 Notchback, 383ci SBF, Highports, 80mm turbo, custom cam, TH400

  8. #38

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    I used the Earl's -6 fuel pressure adapter, and put the Schrader adapter from my fuel pressure test set in it. I like to test as close to the throttle body as I can get, as this shows me the pressure the system is seeing. I have the in-tank Aeromotive 340 in my truck, and I found with the new regulator I had 90 psi, and when I pulled the screen off it I had 65 psi. So the screens won't flow enough, and are acting like a jet in the line driving the pressure up. So test the system when you put in on and if it is high, try removing pulling the screen. The fitting I use: https://www.summitracing.com/parts/e...FcOIswod-GMF5A. Jimmy

  9. #39
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,676

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    I've used this Earl's AT100199ERL adapter fitting and Earl's 100187ERL fuel gauge at the -6AN fuel feed line fitting. The black Earl's adapter fitting has an 1/8" NPT port, which will accept a gauge or a Schrader valve (Earl's 9616SVERL). The Tool Aid 33770/53770 Fuel Injection Pressure Tester uses the common -4 Schrader valve (1/4" flare). Nothing special about it, no fuel mess, and it works great. This Earl's 100189ERL fuel gauge can be used to check the return line pressure if necessary.

    Don't confuse the two different types of Schrader valves:
    1) An Earl's air tank/tire Schrader valve with a fuel resistant core (5/16"-32 UNEF).
    2) A fuel resistant -4 Schrader valve (1/4" flare) with 7/16"-20 threads (LINK/LINK).
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 MT tires.

  10. #40

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    I'm using the Holley drop in 450 LPH pump and have excessively high fuel pressure. Is that pump too big for the Sniper regulator?

    UPDATE: I talked to tech support this morning. Guy knew exactly what I was talking about before I finished explaining it. I received my new cover & regulator this morning. 61 psi. WIN.

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