AMS Ultimate Fuel Pump Test
Uhm yea, that's what I was saying...obviously lost in translation somewhere. But what I am saying is the pump putting out the most pressure will be providing the flow. Take two pumps, run them into a Y-fitting but fed from two different tanks. I GARANTEE you that the pump supplying the most pressure will empty it's tank before the other one even moves.
Uhm yea, that's what I was saying...obviously lost in translation somewhere. But what I am saying is the pump putting out the most pressure will be providing the flow. Take two pumps, run them into a Y-fitting but fed from two different tanks. I GARANTEE you that the pump supplying the most pressure will empty it's tank before the other one even moves.
God bless America! Seriously, I take my hat off to all of those that work to defend this country, not just those in uniform, but in any capacity
If we put our fists together and push the stonger person will push the other person back right? That's a pretty simple explanation but it's the same way with hydraulics. The higher pressure will win against the lower pressure. You can change pressure in any line by varying flow or diameter...bernoulli's principle.
It's crude but it's a basic simple diagram of how a C-130 fuel system works. The pump in the number 1 tank will provide the fuel to the engine until that pump's pressure drops below that of the number two tank. Then the number two tank will supply the fuel to the engine.
This is of course with both pumps operating and feeding the engine at the same time. Don't tell me this is wrong because I know for fact it works this way. Simplify it even more and the the engine is a Y fitting and the tanks are combined.
This is of course with both pumps operating and feeding the engine at the same time. Don't tell me this is wrong because I know for fact it works this way. Simplify it even more and the the engine is a Y fitting and the tanks are combined.
If we put our fists together and push the stonger person will push the other person back right? That's a pretty simple explanation but it's the same way with hydraulics. The higher pressure will win against the lower pressure. You can change pressure in any line by varying flow or diameter...bernoulli's principle.
It's crude but it's a basic simple diagram of how a C-130 fuel system works. The pump in the number 1 tank will provide the fuel to the engine until that pump's pressure drops below that of the number two tank. Then the number two tank will supply the fuel to the engine.
This is of course with both pumps operating and feeding the engine at the same time. Don't tell me this is wrong because I know for fact it works this way. Simplify it even more and the the engine is a Y fitting and the tanks are combined.
This is of course with both pumps operating and feeding the engine at the same time. Don't tell me this is wrong because I know for fact it works this way. Simplify it even more and the the engine is a Y fitting and the tanks are combined.
I agree, if you put a dual fuel pump system in an Evo, one pump capable of putting up 90#'s of discharge pressure (forget about flowrate, it's not important in this discussion), and another capable of 28#'s whilst you set the fuel pressure regulator at 45#'s base, the 28# pump won't pump, just like you say. But why would you do that?
Now if you put a dual fuel pump system with a 90# pump, and an 80# pump, with the fuel pressure regulator set at 45#'s, both pumps are going to flow in parallel, with both pumps having positive flow up until 35#'s of boost. Then the 80# pump will stall, not because of the 90# pump overriding it, but because the fuel pressure regulator is overriding it.
p.s. Cirrusly evolvd let us not forget this situation that "pressure" is beign measured in terms of "flow" or lack there of.
Pressure in this case is just a measure of the restriction of flow.
example:
20 psi throw a gt1r turbo blowing into a 1 inch pipe of infinite length is not goign to flow the same as a gt500r turbo making 20 psi through a sewer pipe of infinite length.
so its difficult to compare "pressure" whether liquid or gas.
unless your talking about hydraulics in a CLOSED system of finite volume.
i know the fuel system in this test is not a closed system of finite volume.
it is an open ended system, with a restrictor(regulator) controlling the pressure by modulating how much fuel to return to the tank.
The pressure is going to be the same no matter what proportion of fuel each of the two pumps supply. If one pump flows 500 lph and the other flows 260 lph, chances are that the big pump will flow twice the fuel into the fuel rail, while the pressure will remain constant in all parts of the system. And just becaue a pump will flow alot does not mean it is capable of higher pressures than a pump that flows half of its rating. Sometimes very large fuel pumps do not have the ability to flow high psi.
It depends on the strength of the motor that is turning the pump. and the ratio of that strength to the properties of the pump that its turning.
i suspect there might be other factors involved in the c130 situation.
tell u what, lets get out the ballistics gell and test this c130 myth
lol
from the looks of those pics id say it was a a good bet ams has some layign around there soemnwhere
Pressure in this case is just a measure of the restriction of flow.
example:
20 psi throw a gt1r turbo blowing into a 1 inch pipe of infinite length is not goign to flow the same as a gt500r turbo making 20 psi through a sewer pipe of infinite length.
so its difficult to compare "pressure" whether liquid or gas.
unless your talking about hydraulics in a CLOSED system of finite volume.
i know the fuel system in this test is not a closed system of finite volume.
it is an open ended system, with a restrictor(regulator) controlling the pressure by modulating how much fuel to return to the tank.
The pressure is going to be the same no matter what proportion of fuel each of the two pumps supply. If one pump flows 500 lph and the other flows 260 lph, chances are that the big pump will flow twice the fuel into the fuel rail, while the pressure will remain constant in all parts of the system. And just becaue a pump will flow alot does not mean it is capable of higher pressures than a pump that flows half of its rating. Sometimes very large fuel pumps do not have the ability to flow high psi.
It depends on the strength of the motor that is turning the pump. and the ratio of that strength to the properties of the pump that its turning.
i suspect there might be other factors involved in the c130 situation.
tell u what, lets get out the ballistics gell and test this c130 myth
lol
from the looks of those pics id say it was a a good bet ams has some layign around there soemnwhere
Last edited by lemansz; Apr 6, 2007 at 11:20 PM.
Through a "temperture datum" control. More or less a system that takes inputs of temperature, air pressure, and turbine inlet temperature (EGT). It controls the flow of the fuel into the engine based on what it requires to maintain a set EGT. It's pretty much a fuel regulator but a lot more complex.
