Holley pumps are centrifugal, which means they can?t self-prime. Its not
generally a problem if the height isn?t too much, but yes, it?s better with any
centrifugal pump to have a net positive suction head.
>
> Bud,
> I originally ran a blue Holley pump above the top level of my fuel cell with
> around two feet of hose to it, without a problem and I now use a Facel
> cylindrical type in the same spot, still with no problems. The Holley was
> too loud for anything but full throttle race conditions in my TR3. It buzzed
> terribly loud. If I mounted the Holley at the end of a ten foot stick
> outside the car, it might have been perfect.
> The pump is mounted to the roll cage tube in the trunk and although rubber
> mounted, perhaps the intense buzzing sound was amplified through the cage
> tubing.
> I still have the Holley as a back up.
> I know many use these Holley pumps without problems, that's why I initially
> chose it. I just couldn't tolerate it's buzz during occasional street use or
> touring. Besides the noise it worked fine, above and away from the tank.
>
> // Dave H.
>
> Sent: Saturday, February 4, 2017 9:58:55 AM
> Subject: [Fot] Holley Red Top fuel pump question
>
> List,
>
> Holley recommends that their fuel pump be installed so that the pump is lower
> than the fuel level. Has anyone had a problem with the pump installed
> differently?
>
> My dilemma is that my fuel cell sits low (in a cut out with brackets) in the
> boot of my Spitfire and the previous owner had installed the old Holley pump
> lower than the fuel level but in what I felt like was a dangerous place as it
> was exposed under the car and the fuel lines were also routed where they
> could have gotten easily damaged (basically very close to the wheel well).
> I?m moving the fuel pump and the lines to be inside the boot but it is not
> possible to make the pump sit entirely below the fuel level since the bottom
> of the fuel cell sits below the floor of the boot. The chosen location makes
> the pump sit about 1/3 of the way from the fuel cell bottom.
>
> I know Holley wants to take advantage of the siphoning effect (apparently
> because they push fuel better than they pull fuel) but does that matter as
> long as the fuel pressure is maintained at the proper level for my carbs? I
> figure if I run with the fuel cell full (8 gal) the fuel level will be above
> the pump the majority of the time. I?ve been burning about 3-4 gallons per
> (20 min.) race.
>
> Has anyone had issues with the Holley fuel pumps not being installed exactly
> like Holley says? I?ve seen some other Spitfire racers with the Holley fuel
> pump NOT below the fuel level so I?m hoping it works for me to do the same.
> I?m thinking about one of the two locations shown in the pics. Right in front
> of the fuel cell is my preferred location at this point as the other location
> to the side of the fuel cell would be more vulnerable in a crash situation.
>
> Thanks
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
> <IMG_8174.jpeg><IMG_8175.jpeg><IMG_8176.jpeg><IMG_8201.jpeg>
>
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