Fuel pump requirements

[Eman]

Originally Posted by FED 387

Take a moment and think about something! There is probably enough fuel in the float bowls on a Holley carb to do a burn out and make a full 1/4 mile pass before you run out of fuel at the 1/4 mile mark !!! How much fuel do you think is going to pass thru 4 little jets??? All you are trying to do is overcome the acceleration of the vehicle and keep an adequate supply of fuel going thru the carb to the engine--- Unless you have 600 inches or something like that and you putz around at the starting line a decent pump and large enough fuel lines should be able to supply adequately the needs for most applications. My .02 cents flame away if you want to .... FED 387

Forget to turn the fuel pump on as you pull out of the lanes and do a burnout and see how far you get.

[Hacksaw]

Originally Posted by Eman

Forget to turn the fuel pump on as you pull out of the lanes and do a burnout and see how far you get.

The engine quits before you finish the burnout. Been there.

[FED 387]

Yes they might die doing a burn out you definitely need to replenish the fuel that is used by applying pressure to move fuel from the reservoir to the carb float bowl ---- I said the amount of fuel CONSUMED to do the burn out and run a lap--- You don't need a 500 GPH pump and humungous pressure to accomplish this ---you need an adequate supply--- Now what is an adequate supply ?? That is a case by case scenario that trial and error and experience and advice is going to help you determine the solution to the problem--- I suppose overkill in choosing your equipment will solve it right away but do you really need to spend that much money to reach your objectives--FED 387

[gsa612]

The best bang for the buck would be an Aeromotive SS pump,has 18 lbs preset pressure.I run one on a BBC,Q-jet,1/2 in.fuel line stocker. Steady 6 1/2- 7 lbs.down the track...gsa612

[Dissident]

Regulated fuel pressure on a QJ at 5-5.5psi will supply enough fuel IF the n&s is sized correctly......pardon the digression...

Most if not all stock and super stock cars have the fuel supply sump (tank or cell) in the rear, so the system pressure must oppose g.....

Adequate Fuel Supply? The following chart is for gasoline.

In case you have forgotten, without data, you are just another guy with an opinion.

Regards to all that like this kind of stuff,

HB2
Dissident

[FED 387]

Yep---he needs a pump that can pump about 50 GPH so any pump that satisfies a 520 HP engines demands should work --- no need for a 500 GPH pump its overkill and might lead to other problems such as fuel blowing past the needle and seat do to over pressurization--- I think he was originally referring to a Holley carb not a Q-jet but I could be wrong--- he must remember thats it's the volume of fuel the pump has to provide pressure is a secondary factor --- pump location as well as fuel line size and number of restrictions in the line ( ie.fittings-filters-regulators-number of bends etc) is going to affect the volume of fuel that ultimately arrives at the carb

[Dissident]

Cancelling once again cannot get the chart to show up correctly....Sorry.