MTFCA Forum

I found my old thread on fuel flow.
In a nut shell. 1 minute to fill 3/4 of a pint.
I removed everything except the fuel pump.

I just filled a 2.5 gallon gas can.
It took 35 minutes.
2.5 gallons * 4 = 10 quarts
10 quarts / .75 = 13.3 (3/4 quarts)
35 minutes / 13.3 quarts = 2.6 minutes to fill 3/4 quarts.

It seems that the fuel pump is pumping less than half than it should.

Or is my math wrong some place.

2.5 gallons would be 10 quarts which would be 20 pints. 20 into 35 = 1.75 pints per minutes that would be 1 and 3/4 cups. Maybe the flow rate looks low, the bowl only fills as needed and may be sufficient for its needs. ?

Hi, Thinking about my Model T running 30 miles per hour.... I get some where between 15 and 20 miles per gallon. Using the lowest figure 15, I would burn 2 gallons in an hour (30 miles). Your pump puts out 2.5 gallons in 35 minutes or (2.5/35)×60 = 4.3 gallons per hour. Therefore like Mark said, your fuel pump flows a little more than 2 times as much as required for traveling on flat ground here in northern Ohio. Hope that is what you are asking. Bill

If you just meant to compare it to your old measurement, 2.5 gal = 10 quarts or 20 pints. 20 pints/35 mins = .57 pints per min. Bill

The beast that I am feeding is a speedster with a touring Frontenac head.
I put the fuel regular in line and did another test.
2 gallons took 23 minutes.
It seems a little faster, definitely not a accurate science experiment.
Now to try to run it and see how far I can go.

I made some changes in the fuel line setup.
Current configuration now pumps 2 gallons in 28 minutes.
Is this going to feed my thirsty beast?

4 gallons an hour? Darn, that sounds anemic for a hot engine, depending how you're feeding it and how hard you push it. I think that's what I spend, maybe a hair less but not much, on my slightly fast but not Fronty-engined '15 touring... I may be wrong, but yeah, I can get more than that out of my gravity fed stock system...

My feeling (and it's like an opininon, and everyone knows what those are worth ) is you want a fuel system that is capable of putting slightly more than what your engine accelerating and holding to WOT will accept, and use your carb float to regulate. If you jump on it hard and it drains your float bowl faster than it refills, then you need more fuel.

And that advice is worth exactly what I charged for it!