Asura

I see what you mean now about the FMU. I have never installed a Vortech before.

I guess they both have ESMs then. Too many acronyms.

I remember reading a post about converting a rising rate FPR to a static by removing the vacuum, but I also remember Fred saying it couldn't be done.

I would also check the line and banjo fitting from the gauge to the FPR.

C4SxM5

Ok, I'm getting confused now

So the RED UFO thing is a COMPTECH FPR right, also known as a Vortech FMU, right?
I could/should remove this? If so, is there any re-routing of wiring/tubing?

My car is running fine right now other than the fuel pressure gauge not working, so should I just remove the FPR pictured above and get a new gauge?

Sorry, I'm totally confused now!

Asura

You can REPLACE that UFO thing (comptech FPR) with a different type of (static) FPR.
BUT you must have AN FPR. OK?

C4SxM5

Since I will need an FPR, can't I just keep the one I have currently in the car or is this particular one the cause for the gauge not working?

Also, if it is the cause of the gauge not reading anything what kind of FPR in particular should I get?

Scorpion

Ok let me see if I can clear it up...FMU stands for fuel management unit. Both Comptech and Vortech use a rising rate FPR. The red one (you have) is the comptech unit, the blue on is the vortech unit. They both do the same thing. The only differance is that you can adjust the base fuel pressure with the Comptech one.

Now should you remove it? Yes, but only if you have a stock or adjustable FPR to put on the car. The reason for this is that you have the EMS to adjust the pulse width of the injectors, and do not need a rising rate FPR to add fuel under boost.

You can leave that one in the car, but it will make tuning your fuel a nightmare. Rising rate FPRs are not very consistant. However it will work and if that is all you have then use it

If the gauge is not readin there are really only to problems. One..it's broke. Two, you are not getting fuel to the rail. If the car starts, you know it's not number 2

C4SxM5

Well I actually had the car tuned with it in already and the only thing that was altered I believe was the cutting of the hose with the blue arrow and sealing of it.

You can see my DYNO by going to the first post and clicking on UPGRADE. I think I'm going to leave it alone since it isn't broken, so why fix it

[QUOTE]If the gauge is not readin there are really only to problems. One..it's broke. Two, you are not getting fuel to the rail. If the car starts, you know it's not number 2

Scorpion

I'd get a liquid filled gauge. The liquid dampens the engine vibrations, which I'd be willing to bet caused this that one to go TU.

C4SxM5

any reccomendations on "liquid filled" gauges?

Sideways

Greetings.

Shawn tuned it with the FMU installed but no vacuum to it so it acts like a regulator but not an FMU. If you change the fuel pressure by removing the FMU and don't get it the same with a new regulator you will need to retune.

You can get a good liquid filled gauge for less than $40. The AEM FPR is closer to $200.



I suggest you leave it as tuned and just replace the B&M gauge.

gary_phd

[QUOTE=Scorpion,Jan 4 2006, 11:57 PM] If the gauge was working he could have figured that out