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Thread: 12-1800 for big HP E85 on street.

  1. #1

    Default 12-1800 for big HP E85 on street.

    Hello. I'm looking to possibly run a Holley 12-1800 E85 compatible fuel pump on the street, but I'm concerned about the written warning about running past 20 minutes or over 90°F. If I could get a running time of 45 minutes then the pump would be perfect. So my question is would this pump stand up to longer running periods, if I ran a digital relay and duty cycled the primary pump down to say 40% duty? The idea would be to duty cycle the primary up to about 40% throttle and past 60% throttle, activate the secondary pump. I'm currently running a 12-1200 pump, so a direct drop-in would be ideal. This is all controlled by Dominator EFI.

  2. #2
    Join Date
    Dec 2009


    The Holley 12-1800 fuel pump is not capable of circulating "hot fuel" in street driven applications. Read more about it here: (Holley EFI Fuel Pump & Filter Catalog - Page 2 & 3) (Holley Fuel System Selection Chart)

    The newer Holley "hot fuel" capable (pump gasoline/street driven) fuel pumps are Walbro (internally).
    The race gas, diesel & E85 only fuel pumps are Delphi (internally). Their newest brushless fuel pumps are made by TI Automotive.
    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.

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