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Thread: High Fuel PSI

  1. #1

    Default High Fuel PSI

    My fuel psi is over 90 according to a brand new Auto Meter pro mechanical gauge tied in at the inlet to the Sniper using an AN adapter.
    I did the search function on here and found a similar high PSI issue that was fixed by clearing the return line.

    I have checked the return line hose for kinks and have removed it and blew through it without any backpressure. (I'm running from a fuel cell
    on the garage floor 10 feet away with lines in plain sight and do see fuel coming from the return at a decent flow.)

    So before I hook up another gauge to see if the Auto Meter is bad (assuming I can find a 0-100 test gauge in my shop).
    I did read some comments on regulator issues is there a way to check it for an issue? It seems to ramp to 60 psi on the initial
    prime, but as soon as the motor start the psi spikes.

    I guess a workaround would be an inline return/filter regulator? EDIT: I just ordered a Holley return/regulator and cap for the Sniper outlet.
    Oh, this is not an OEM Master Kit, but the fuel pump should be the same EFI System Pro shipped with this kit. Thanks, Zmann
    Last edited by Zmann; 04-12-2017 at 05:55 PM.

  2. #2

    Default

    While I'm waiting on my Holley regulator/filter/return, I checked my new Auto Meter against another gauge, psi spikes to 90+ and stays there even with flow from the Sniper return. So my new gauge is good, that's nice. But either I have a defective Sniper regulator or a pump that is overwhelming the Sniper regulator. EDIT: Just checked my pump. Walbro GSL392 255 LPH 43.5 psi 87 psi 670 HP 540 HP

    UPDATE: So I just installed a -6AN cap on my Sniper EFI regulator return, and installed my new Holley 12-875 $140 inline 10 micron filter with its own regulator, and return set at 60 psi (used the same fuel line I had originally hooked to the Sniper return), and my fuel pressure is now normal 65 psi. I wonder how many folks are running around with bad Sniper EFI regulators? And what the effect is? I'm still going to talk to Holley, but my troubleshooting really only leaves the Sniper EFI regulator as the problem, IMO.
    Last edited by Zmann; 04-14-2017 at 05:28 PM.

  3. #3
    Join Date
    Dec 2009
    Location
    Connecticut
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    18,685

    Default

    The Sniper fuel pressure regulator is easy to disassemble and/or replace. It uses this same fuel pressure regulator kit: LINK. I would at least remove & inspect it, to ensure it hasn't failed because it's clogged with fuel plumbing debris. If so, I'd at least inspect the fuel injectors too.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  4. #4

    Default

    On my install and lots of issues getting it to stay running. I did a fuel pressure check. It pegged my 120 psi fuel pressure test gauge back around to the needle stop. Holley sent me another regulator that got it down to 90. It seems to be running OK with this pressure, but the duty cycle on the injectors seems pretty low at idle & cruise. Will just have to see how it goes. I have an in-tank Stealth 340 and it seems like the regulator may be undersized. I did an air pressure check on the system before I put it back on with the new regulator, and it did not lift till after 70 PSI. I think this is something that needs looked into. Jimmy

  5. #5
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    Connecticut
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    18,685

    Default

    Quote Originally Posted by Gadget View Post
    Holley sent me another regulator that got it down to 90. It seems to be running OK with this pressure, but the duty cycle on the injectors seems pretty low at idle & cruise.
    The Sniper EFI should be run at 58.5-60 psi fuel pressure. I wouldn't continue running the engine with that much fuel pressure. I'd contact Holley Tech Service (LINK) and determine what's wrong.

    Holley sent me another regulator...
    Is THIS the fuel pressure regulator kit Holley sent you?
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  6. #6

    Default

    That's it. This is my daily driver, so not driving it is a problem. I had the luck of good weather when I did the swap and could ride my motorcycle. I think you guys need to build a test rig and flow the regulators, both before putting them in the systems and before sending them out. Everything in my system is new from the tank to the air cleaner. The first one that came out had zero debris in the screen. I'm running an ACDelco fuel filer. It may be the orifice size is the limiting factor. Jimmy

  7. #7
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    18,685

    Default

    Quote Originally Posted by Gadget View Post
    That's it.
    Thanks for the confirmation.

    It may be the orifice size is the limiting factor.
    I suspect this too. Your high output fuel pump may be too much for that small OEM fuel pressure regulator.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  8. #8

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    If it's an issue it would be nice to know. Would be a good piece of information to clearly post in the sales information, so folks would know before ordering it. I have this tank and it's really popular for they truck guys going EFI or LS: http://www.fueltankparts.com/67-72-e...-bed-fill.html. Is there a inline regulator that you have experience with, that could be installed in the engine bay to test the system to see if it does better on the lower fuel pressure? I have some stuff left over from racing with mechanical fuel injection. I'll have to look to see if I have a high speed still in the box. I could set it to 60 and see what happens. I'm sure it will flow plenty. Jimmy

    I checked the pump that's part of the kit is 80 GPH and the internal regulator should be good for that plus some I would think. So my Stealth 340 pump is 340 LPH or about 88 GPH. Not that much bigger but big enough to cause issues. Going by the specs on it, looks like I will need something along the lines of the 12-880. Danny, can you chime in on this issue and let us know what the flow capability of the stock internal regulator is and the design flow values? I think it would be good to flow some systems and see what you get. If it won't flow the fuel load the available options for fixing it? I think this will help a lot of folks that may be making the switch to the Sniper EFI and have a pump already. I have close to two grand in this conversion, and not looking forward to another $150 in parts to make it run correctly. Jimmy

  9. #9

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    I've been trying to chime in on this thread for several days, but I couldn't gain access. Finally. So I basically had the same issue as Zmann. My 100 psi gauge was pinned. No restriction in return line. I confirmed zero flow out of regulator return port. After unsuccessfully trying to get tech support, I contacted my supplier Performance Improvements here in Canada. They were awesome, again. They received a late evening reply from Holley Tech. They admitted to a known problem with a small number of units in the early build lots. The regulator cover clearance was not specced properly. The fix is a new regulator cartridge, plus a new regulator cover plate. Mine is on the way, no charge. Regards, Gary

  10. #10

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    All I got was the regulator a week ago and no new cover. Still have the issue. It's better, went from pegged passed 120 and down to 90 psi. Jimmy

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