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Thread: Too much fuel on initial pump prime.

  1. #1

    Default Too much fuel on initial pump prime.

    Good evening! 440 RB Mopar stroked to 500, Super Sniper Stealth 650, HyperSpark ignition system. Got everything hooked up, triple checked. I first went through the initial setup on the handheld yesterday. Everything seemed fine, fuel pump came on, pressure at 60 psi, Sniper gauges worked. OK, today, tried to start, seems to be squirting way too much fuel! Will geyser out the top, splash onto manifold. I was able to get engine to start. Did have to open throttle, just like flooded carb. When it finally started, had to hold throttle open, then seemed to clear out. Shut off, double checked pressure, tried to restart, same thing. I did let it get up to temp, 190°F plus, set idle screw to 850 RPM what I programmed handheld, cycled key, same thing. I know I have only let the car run for 10-15 minutes, so it hasn't had time to Learn, but should it spray this much fuel? What should I do first? Thanks in advance! Jeff

  2. #2

    Default

    What tachometer are you using? Does it have the indicator sweep function when first powered on?

  3. #3
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,129

    Default

    https://forums.holley.com/showthread...400#post104400 (Holley Sniper EFI Rev Limiter Verification Feature Disabled)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, 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 M/T Street Comp tires.

  4. #4

    Default

    Hey guys. Thanks for the response. I don't have the tach hooked up yet. I'll be using the factory in dash tach as soon as I get everything else dialed in. All the ignition is the HyperSpark (Distributor, CD box, coil). I do have three Holley gauges hooked up through the Sniper with the correct gauge module. They do sweep when I turn the key to "ON". Is there something in that system that could cause the excessive fuel? Could I have set something up in the initial setup incorrectly? Thanks again! Jeff

  5. #5
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,129

    Default

    No, the Holley gauges don'tcause that problem.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, 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 M/T Street Comp tires.

  6. #6
    Join Date
    May 2019
    Location
    Ct
    Posts
    203

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    Is it possible your Fuel Prime accidentally got set to 1500%? Sometimes if you click to many times it isn't fully highlighted in the field to overwrite.

  7. #7

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    That is a good question. I hadn't thought of that failure mode, but I can see how it would happen. The handheld is very error prone to use when inputting with a finger. Using the stylus reduces the input errors, but a lot of people use their finger which creates a lot of bad input data.

  8. #8

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    Hi guys. I checked that parameter, and it's set at 150%, multiplier is 5. I may try lowering the Fuel Prime a few % to see if it helps. I do use the stylus to make changes or I would "fat finger" in an error! Thanks again! Jeff

  9. #9

    Default

    When you are debugging things, don't mess around by lowering a number a few percent. Just set it to zero and see what happens. First rule of debugging is to go find the corners of the problem and then work from there. Pussyfooting around in the middle of the problem set, making tiny adjustments doesn't solve anything. Go big and see what happens. Turn things on and off and then string the clues together.

  10. #10

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    Thanks Andy. This Sniper setup is all new territory to me. I'll be learning as I go. I'm glad you all are here to help me. BTW Andy, when you have time, check my post on Moparts, in the general section, regarding the Denso alternator wiring/alternator issue I'm having. Seems like when I build engines/repair customer's vehicles, I don't have a single issue. But when I do it for myself, I have all kinds of issues! Thanks and take care! Jeff

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