My $0.02 on V6 fuel rails

[Nod]

I've run 3vz rails on my 1mz for about 4 years and not had any of these issues. Curious !

[dogfacedoc]

2 year old sticky thread, guess I'll ask here..

http://www.midshiprunabout.org/mk2/v6-swap-primer/

Fuel Return: Adapting Properly
The MR2 comes stock with a fuel return system, which must be addressed by either installing the pump from the source car into the gas tank, tapping the fuel rail to accomodate the return line, or obtaining a fuel rail from a 3VZ-FE which is a direct fit.

3VZ-FE Option
“This is old news to Camry guys but a 3VZ-FE return fuel rail system will bolt right on to 1MZ-FE. this set up gives you the regulator, lines etc.. just bolt on. you can probably get one from junk /core motor at a yard for cheap. …if you have a turbo and still have fuel line it will bolt right up. otherwise (non-Turbo owners) you will have to have new hose crimped on. The rails from a 94-96 1MZ-FE will have full return style system and your MR2 return line plugs right in.

…if you are a little unsure about tapping stock 1MZ-FE rail i would highly reccommend the 3VZ-FE rail install…save time and will be 100% OEM.” -derek2000GT

Tapping the Rail Option
“The fuel rails are fine if you do not want a return system, but you will have to have a fuel pump with a FPR or an in tank FPR like a Camry, as the 3S-GTE has an FPR on the fuel rail in the return system. I have an adjustable FPR (AEM) on one of my fuel rails for when I go to larger injectors. I bored out the end of the stock rails, threaded them on the outside, and connected them with NPT fittings to the MR2 system.” -chall

I have used the earlier fuel rails and also welded -6 lines with an adjustable regulator for my two cars.

From what I'm reading, I can basically just swap the entire pump assembly from the Solara into the MR2 tank and not have to worry about a pressure regulator with fuel return?

[Paul Woods]

The problem with that is you won't get a Solara pump assembly into an Mr2 tank unless you do some major cutting and welding of it (good luck with that!)

You're trying to reinvent the wheel in all honesty, just fit an external regulator and T it into the fuel feed line, run the return from that back to the Mr2 tanks normal return line, job done.

[MMaddict]

Dogface, I'dd suggest just to do what paul says. Fitting a FPR isn't that much work anyway.

[Andysautowerks]

Here in the USA, the 3mz-fe fuel rails, have the same part number as 1mz-fe. I used a 2000 sienna and a 2005 sienna for part numbers comparison. 6BB12B52-20A3-404D-BC35-989A3D61BBA7.jpg