I am putting together a turbo kit for my 1997 Jeep Wrangler TJ with a 2.5L 4 cyl motor. I am going to upgrade the injectors and use an FMU to run around 6-7 psi of boost. The problem is that on the Fuel rail for my Wrangler there is no fuel return line, my question is how should i install the FMU? should i just run a fuel return line to the tank? and remove the regulator and filter assembly from the tank and use an inline filter?

any help greatly appreciated.

thanks
John

 

You will have to remove the stock pressure regulator/filter and run a return line. You may have to modify the stock fuel sender assembly to eliminate that regulator. You will have to run a regular fuel filter before the fmu and tap into the sender for the return off the fmu by drilling a hole and maybe using some brass fittings and jb weld.

 

Check it:

http://www.autospeed.com/cms/A_2637/article.html


Or you can take out the FPR out of the fuel pump assembly and run a return line.

 

thanks for the help guys, im sure ill be checking back in when i get started with this project!

 

you dont need to run a return line to the tank. You can tee a ling off before a inline boost pump, then T it again at the fuel rail. Bring that line into the FMU, then back to the T before the inline boost pump.

I did this setup on my dakota for 2 years with no problems. Had consistant fuel pressure rise like a FMU should.

 

Could you elaborate on this? I have the same problem with my is300 (returnless) I think I know what your taking about...

 

I sure can. Heres a drawing I sketched up real quick when I did my fuel system, Yours will be setup up the exact same if you dont have a return line. Just change around the fitting sizes to meet your needs. I wrote in the fitting sizing so I would only need to make one trip to the hardware store. I used a MSD inline booster pump. From my experience this pump will get you in the 500hp range, feeding over 100psi to the injectors with a 12:1 FMU plate.

 

If I ever install an fmu again on a returnless fuel system, I am goint to try it that way.

 

wow that is sooooo much easier than the other way, i am definetally going to do that! thanks so much for the help!

 

---- yea, thanks man,

that makes it much easier to understand. All the is300 guys run it to the tank, but then again they run madtyte jdm fuel systems too.