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Thread: Fuel priming before first start attempt.

  1. #1

    Default Fuel priming before first start attempt.

    Hi. I have a Holley Terminator Stealth that I'm looking to start for the first time. On the regulator, should I mess with the default setting before I start it? I have primed the system to check for leaks four times (found one fitting I missed), but it seems solid. I'm seeing 31 psi on the handheld (which I'm not sure where the reading is coming from. I do have a pressure transducer on the regulator so maybe there?) Do I need to prime it a few more times for the pressure to come up to 43 psi or is this all normal?

  2. #2
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    Quote Originally Posted by hutchenc View Post
    Do I need to prime it a few more times for the pressure to come up to 43 psi or is this all normal?
    Five seconds is the default Fuel Pump Prime time at key-on/engine off.
    The fuel pump runs again when the ECU receives an RPM signal (cranking).

    The Fuel Prime Percent works differently depending on the type of EFI system it is (MPFI vs TBI).
    Disregard the Autoprime reference in the "Help" Contents. That's not for the V2 & later EFI software/firmware.

    Originally Posted by Holley V2 Software Update Overview
    6.2 Fuel Prime
    There is a new fuel priming “Quick Start” feature available for every type of system. For MPFI applications, the system
    will inject a single pulse of fuel, after the first crank pulse is detected. This will only re-occur after an engine starts. In
    other words, if you try to start an engine and it doesn’t successfully fire, it will not keep adding this fuel - only the first
    time it sees a crank tooth, for that run event. For TBI applications, the system will inject a single pulse of fuel when the
    key turns on to wet the intake manifold. This will only re-occur, after an engine has started. If you cycle the ignition key
    multiple times, it will only perform the first prime.

    This feature must be enabled, by selecting the “Enable Fuel Prime” check box located in the System ICF under System
    Parameters > Engine Parameters > Startup Settings. Once the “Enable Fuel Prime” box is checked, it will show the “Fuel
    Prime Percent” parameter. The “Fuel Prime Percent” is a multiplier that works off the “Cranking Fuel” Value in the Startup
    Enrichment table. The pulse width of the single shot of fuel prime fuel is based off the Cranking Fuel value (which is
    temperature based) and multiplied by the “Fuel Prime Percent”. A starting value of 200% is usually a good point for MPFI
    engines and 50% for TBI applications, with a range of 40%-250% usually being an acceptable range. This can be
    adjusted as needed.
    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/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  3. #3

    Default

    So essentially I shouldn't worry about the pressure before I start I'm assuming? I think my Fuel Prime Percent is at 150%. (I haven't touched it. It's whatever the Global File already had set for TBI.)

  4. #4
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    Quote Originally Posted by hutchenc View Post
    So essentially I shouldn't worry about the pressure before I start I'm assuming?
    http://forums.holley.com/showthread....ents-Read-This (Initial Checks & Adjustments - Read Step #2)
    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/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  5. #5

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    Thanks Danny. Do I need to run a vacuum reference hose to the regulator on this thing? It's naturally aspirated.

  6. #6
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    Quote Originally Posted by hutchenc View Post
    Thanks Danny. Do I need to run a vacuum reference hose to the regulator on this thing?
    Yes, I always suggest connecting the FPR vacuum reference hose.

    It's naturally aspirated.
    That's why it's called a vacuum reference hose (in this application), as opposed to a boost reference hose. That same port functions both ways.
    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/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  7. #7

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    Got it. There wasn't any mention of running one in the Terminator documentation, but that's obviously no biggie. Thanks.

  8. #8
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    You're welcome.
    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/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

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