chris-reedtn

Ok what is this and how does it work?? I see them on many japanese cars, and some US cars but i really dont under stand that much about them, or what they are for, i do realise that they are for fuel, but in some way do they attach to the fuel return line, and get all of the fuel that is not used?? I dunno.

-CHris

vicious525E

the way i perscieved (damn my spelling!!!!!!) was that a fuel pump ran to the collector tank as well as the fuel return line(to the top of the tank), out of the bottom of the collector tank was your primary fuel line and another fuel pump, im pretty shure it is supposed to keep your car from running lean or getting air bubles into the line at high G turns, if anyone knows please shed some light on this, because iv wondered about this too, all i have is a vague idea of how it could work...

DaleClark

iTrader: (55)

It's just like a capacitor in a car stereo system - it's a little extra reservoir in the fuel path. During an extended high-g turn, fuel can/will slosh to one side of the tank and starve the fuel pickup. The collector helps this out.

This isn't as much of a problem on the 2nd gens as on the 3rd gens. You only have a problem on a 2nd gen with REALLY low fuel in the tank. 3rd gens can do it with even a quarter tank.

Dale

chris-reedtn

Hey thanks Dale!

-Chris

EndlessRPMs

so it's basically a fuel cell??

scathcart

not a fuel cell, a separate reserve tank. You have a low pressure pump feeding this sump from the tank, and then a high pressure pump feeding the fuel rails.

scathcart

This what you're thinking of?

https://www.rx7club.com/forum/showth...ght=surge+tank

chris-reedtn

by that diagram the stock fuel pump pumps to the collector tank, then a bigger fuel pump removes gas from the tank, so wouldn't this just suck the tank dry before the stock fuel pump could replace the fuel.

-CHris

NZConvertible

There's no way the stock pump would be used in that set-up. The in-tank pump still has to be able to supply as much fuel as the engine needs, it just doesn't need to provide the high pressure the injectors need.
I personally don't like that set-up because the fuel from the return line goes to the surge tank, where it can be picked up straight away and returned to the engine. Recirculating the fuel like this raises it's temperature, which can lead to detonation.
It's better to return the fuel back to the main tank instead. This keeps the fuel temp down. The only downside is the in-tank pump must be able to keep up with the flow of the high-pressure pump, not just the engine.

vicious525E

no because, to suck it dry i would need air to fill the tank instead of gas, but a high flow fuel pump would be doing all the work in a set up using the stock fuel pump and a faster flowing one...

rotorbrain

Yea, but that is the idea, if you go into a long high=G turn with a big fuel pump then the intake pump does not pump gas, adn the inline high flow pump would suck the Resurve tank dry and you would run lean. No the high flow fuel pump would not be doing all the work, just keeping the pressure up, But The hole system Like NZ convert said, Is dependent on the intake pump, which must be upgraded, and you are still bound by the flow of it.

-CHris

rotorbrain

Damn paul was using my comp, and its still loged in to him, sorry

-Chris

chris-reedtn

OK got my name back, Yea, i do see that this would cause fuel heat, but if running this type of setup, either way the fuel that by-passes the regulator adn then returns still mixes with other fuel from the tank, or in the tank, i think that this might keep fuel cooler, because instead of returning to the tank to mix with all the fuel, it is mixed with fuel heading to the motor so it would be say half and half, also you do have a return line to the stock tank from the collector tank so when it mixes with fuel to keep pressure up, it then returns to stock tank, either way, i dont think that this would cause fuel heating probs, but now im kinda curious to find out.

-Chris

DaleClark

iTrader: (55)

Are you considering doing this? Or are you just looking at it from a learning standpoint?

Again, I can see the application in a full race car. But, unless you REALLY need it, you're just adding more stuff to break, more potential fuel leaks, and a loud fuel pump out of the fuel tank. I would have the problem then fix it, not the other way around.

Regardless, interesting info.

Dale

chris-reedtn

Yea, i was just looking thru my RE-A book and saw them, and then there was that slight spark of interest. No i do not plan to do this, but i have seen several street cars from japan, and here in the us (magazines) That have these crazy *** fuel systems in the back, And i just sorta wondered why, and what performance this might add or help.

-Chris

Hey nice title on the avatar dale! But then again, you knew that all along