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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.

    '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

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