Technical Electric Fuel pump ? help please >

I use Mallory pumps and filters, then use a Holley regulator, the Mallory pump has an internal regulator and is a Gerotor design for quiet, reliable performance and there is no chance of vane breakage or issues. You can get everything on Holley's web site, here's a link to a 110 pump which should be more than adequate for what you have.

https://www.holley.com/products/fue...ps/carbureted_electric_fuel_pumps/parts/29256

 

Thanks for your responses..
So there’s no need for a regulator for the Carter 4070? it's ok? just filter..

 

Theoretically you wouldn't need it, but it's a nice failsafe incase the pump is defective, if you opt not to I'd suggest to at least test the output with a fuel pressure guage to make sure it's not above 7.
It could also change if you used a smaller diameter fuel line than recommended, like how blowing through a straw has more pressure than blowing through an exhaust pipe.

 

This isn't true. A smaller line does nothing to increase or decrease pressure. A smaller line is more restrictive and won't flow as much at the same pressure.

There is loads of information about how much fuel per minute an engine needs for a given horsepower. This fuel rate can be used to determine if your fuel line is adaquite. If you put the electric pump in or very close to the tank the origional 5/16" (8mm) line is likely mote than adaquite. Remember that line used to be used to pull fuel from the tank to the mechanical pump which is much less efficient than pushing the fuel through the same line.

 

Just as an aside, diaphragm type mechanical fuel pumps are fine for suction which is why they are put on the engines, far from the fuel tank.
Electric pumps are very poor at suction, and damaged by running dry, which is why they are put as close to the tank (and as low) as possible.

 

In water flowing pipeline, pipe size and water pressure are dependent on each other. Because if the diameter of a pipe decreased, then the pressure in the pipeline will increase. As per Bernoulli's theorem, pressure can be reduced when the area of conveyance is reduced.

 

I have a 10 foot air hose with a pressure gauge on each end, one at the compressor tank and one at the hose end. When the air compressor is at 100 psi tank pressure the gauge at the end of the 10 foot hose also reads 100 psi.

When I connect all 4 of my 50' 1/4" air hoses end to end making my 10' hose now 200' the pressure gauge still reads 100 psi tank end and hose end..... when I open the end of the 200' hose, then the end gauge drops as the system is dynamic and the flow is effected by both the size of hose and length.

Velocity is increased as the area of conveyance is decreased, which makes for a greater pressure drop as flow is increased.

Fluid dynamics are just that dynamic.

 

Hey so a flathead Ford mechanical fuel pump has a byp*** or something such that an electric pump can push fuel through it when the engine is off? To fill the carb before starting..

 

I don't think a large-diameter pea shooter will be very effective; straws work better.

 

All conventional mechanical fuel pumps can have fuel pushed (or ****ed) through them, which is another virtue of their simple and excellent design. The pressure just has to be enough to lift the check valves off their seats, probably one psi or less.

 

Late to this thread, but I wanted to share this explanation of Bernoulli's equation. If the cross-section area of the tube or pipe changes, then the velocity of the fluid will be different at the various cross sections. The total flow rate will be the same throughout the conduit, thus velocity will increase at smaller cross-sections and decrease at the larger cross sections. the change in velocity will change the pressure in each region of area change. Think of the expression "still waters run deep". In a flowing fluid, the pressure may change as the pipe or tube diameter changes. The pressure also changes with depth in a body of fluid; more pressure at the bottom of a swimming pool than near the surface. An electric fuel pump benefits by being below the gas tank because of the push to the gas as it enters the pump. A garden hose laying on flat ground will have the same pressure at any point along the hose.

 

Basic conservation of energy.

Can calculate the static pressure at any depth in water. At density of water, pressure is 0.434psi/ft of depth.
Gasoline has a density 0.71 of water so pressure in gas is 0.31psi/ft of depth.