Im in the process of upgrading my fuel system to get ready for a Hahn Stage 2 kit. I have the GS-T Walbro in tank pump, (Im using Corbins re-wire instructions) and Im gettin RC injectors. My question is, can I use the Vortech FMU instead of the SFMU? My friend has one he said he would give me for nothing if I can use it. Whats the difference?

not with larger than stock injectors. you'll need the sfmu. you'd be much happier with the sfmu even if you were running stock injectors.

Will a GST pump work in our cars? I didn't think it would. As for the FMU only if you will be using stock injectors, otherwise get the SFMU

we have the same fuel pump housing as gst's

The FMU is strictly a fuel pressure riser. It will rise the fuel pressure based on boost, and it requires an external fuel pressure regulator. The SFMU is a fuel pressure riser and adjustable fuel pressure regulator all in one.

So like Kirby said - only run the FMU if you're sticking with the stock injectors because there's no need to adjust the base fuel pressure. To use bigger injectors, you'll have to lower the starting fuel pressure, which can't be done with the stock fuel pressure regulator.


95 Eclipse RS : 5 speed
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html