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Thread: EFI GAS Tank Pressure

  1. #1

    Default EFI GAS Tank Pressure

    I have an HP Dominator and wanted to feed it more fuel. I recently upgraded all of my fuel systems and capped off a vent pipe that I found open to air and parallel to the tank. I did not see any evidence of leaks around it. I'm wondering what have you all have done for this? I noticed this when I went to fill the tank. It took about 30 seconds of hissing before I could remove the cap.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,759

    Default

    Yes, your fuel tank needs to be vented. What vehicle is this? Does it still have a charcoal canister connected to the fuel tank with a hose/line?
    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.

  3. #3

    Default

    Thanks Danny. '79 Camaro, Charcoal canister has left the building about 20 years ago. I do still have the vent line, but it's just at the tank side near the leaf spring. The old setup had this open to the air. I guess I can do the same, but was wondering if anyone knows of a better more permanent solution. I saw the Tanks, Inc. Rollover Vent, but before I run with it any recommendation would be preferred. -Melo

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,759

    Default

    Yes, the rollover vent valve is what I intended to suggest next.
    https://www.holley.com/products/fuel...s/parts/19-174 (Holley Remote Mount Vent Valve for EFI Fuel Tanks.)
    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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