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Thread: Which in-tank fuel pump?

  1. #1

    Default Which in-tank fuel pump?

    Regular Sniper 4 barrel. Walbro 255 in-tank pump, new actual Walbro, not knock-off. -8AN feed and -6AN return to tank from Sniper. Pressure gauge at inlet of Sniper is only reading 35 to 40 psi. Vehicle is 5.0L swapped '99 Ranger, stock tank. All factory fuel lines removed. What pump you all recommend for in-tank to get up to 60 psi?

  2. #2
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    Electric fuel pumps only produce volume, the fuel pressure regulator sets the desired pressure. Maybe replace the fuel pressure regulator (LINK).

    Don't confuse psi ratings with what the pump is actually capable of.
    The psi ratings are for performance (volume) information only; they're not a pressure setting.
    EFI fuel pumps have a wide range of psi capability; you set the exact pressure you need/want.
    Electric fuel pumps only produce volume, the fuel pressure regulator creates the desired pressure.
    Also, any EFI fuel pump will decrease volume output (GPH flow) as fuel pressure is increased.
    http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart)

  3. #3

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    A Walbro 255 LPH pump is more than capable of supporting up to 600 HP. Look for issues somewhere other than the actual pump. Is it getting battery voltage when you turn the key on? Is it getting close to alternator output voltage when the engine is running? Andrew

  4. #4

    Default

    Thanks for the information Danny. None of those pumps appear to be in-tank models though. Would a new Sniper with roughly 100 miles on it be prone to having a bad regulator? In case you're wondering, plastic stock tank, cleaned when it was out, filter sock is on pump, and have a new 10 micron filter just after the tank. The fuel line is only about 8" in total length from tank to Sniper. Also still looking for recommendations on an in-tank pump that will do 60 psi to achieve what the Sniper is asking for? Current estimate of 350 HP. Looking at Holleys 19-340. Seems they're not known for reliability though?

  5. #5
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    Quote Originally Posted by 2drxploder View Post
    Would a new Sniper with roughly 100 miles on it be prone to having a bad regulator?
    Yes, Sniper users have replaced fuel pressure regulators often on this forum.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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

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    So do you suggest to upgrade to an external fuel pressure regulator? If so, how do remove/cap, whatever is necessary to bypass Sniper fuel pressure regulator.

  7. #7
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    Quote Originally Posted by 2drxploder View Post
    So do you suggest to upgrade to an external fuel pressure regulator?
    No, just ensure the Sniper fuel pressure regulator isn't the problem (because that's what dictates fuel pressure, not the pump).

  8. #8

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    I'll throw a cap on the return side of Sniper temporarily and see what the pressure does.

  9. #9

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    Rubber line attached to pump was shot. I replaced it, 60 psi!

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