How to get around returnless fuel system problems?

i think Seth W's thread had some pretty good info on that... although i'm not sure if it had everything that you need since it was a while ago that i read that.

http://mr2oc.com/showpost.php?p=938027&postcount=12

This is more of a general question. I don't even own a mk2. I'm just trying to get an idea of what it takes to make a returnless engine work with a return type fuel system.

From what I can tell, you can use your stock fuelpump, you just have to generate the needed 45psi in the fuel rail.

basically your making it so your left over gas gets returned back into the fuel tank. with a returnless fuel system to my knowlege your fuel pump only provides whats needed at that time and with a return system it always pumps x amount of gas and the left overs are put back into the tank.

This is my understanding, I'm not a mechanic so dont qoute me on that.

It's all in my CA smog sticky:
http://www.mr2oc.com/showthread.php?t=144375

Thats what I needed to see. Thanks

I think I got a better idea for the returnless fuel problem.

Why not just put that T pipe on the outside of the tank? Maybe after the fuel filter? Attach the camry pressure regulator. One side would go to the T, and one side would go to the regular fuel return line.

California referees might not like seeing the regulator on the outside, but for the rest of us non-california residence, it would save dropping the fuel tank.

mr220v said:

I think I got a better idea for the returnless fuel problem.

Why not just put that T pipe on the outside of the tank? Maybe after the fuel filter? Attach the camry pressure regulator. One side would go to the T, and one side would go to the regular fuel return line.

California referees might not like seeing the regulator on the outside, but for the rest of us non-california residence, it would save dropping the fuel tank.

Click to expand...

Interestingly, it looks like that is exactly how the 96 Avalon 1mz-fe fuel system is engineered. The 96 Avalon has a fuel return line, but it looks like the regulator splits off the extra fuel volume just before the fuel rail.

That's how an fpr works. That's all I did inside the tank. Could have just as easily done it outside the tank. The only difference between that and the mr2 stock fpr is that the camry one doesn't use manifold pressure to change fuel pressure. My method frees up the fuel return line to be used as another port for the evap system, which the camry really requires three to do it right, though I'm sure you could fool it by just tee-ing one of the other two.

You might be dropping the fuel tank anyway, depending on whether or not you have a Turbo car to begin with, and how healthy your current pump is.

A pump with 150k miles on it might not handle a continuous 50 PSI very well.

I machined off the closed ends true flate. Then i drilled out the ends, then taped them out. I run a fuel line from one line to the other. Then the fuel just goes down one rail, into the other, then to the regulater.

scott
MK1 v6