Ok so heres the deal... I installed my FMU yesterday with all my new AN line and fittings. So heres how it was setup yesterday...

FUEL RAIL to a T which had the fuel pressure sending unit on it, to the FMU IN. Then from the FMU out to the return line. Yesterday when I started it up it was perfect. I had 30 psi of fuel pressure at idle, and as soon as I tapped the gas it went up to 40 (when the FMU sees 4in vac - 0 psi it has a set thing so the car doesnt lean out). My only issue was 3 of the 4 fittings were leaking. Also, yesterday when I hooked it up, when I would unplug the vacuum line to it the fuel pressure would go up to about 50 psi... which is right.

So today I made a new line with different fittings (Earl's not Summit... the summit ones all leaked). So now today I have a 1/8" T ON the fmu input, yesterday I was using an Earls adapter for the fuel sending unit. I also lost my check valve, I had to get a new one and put that on the other side of the FMU. So today I start it up... no leaks, YES. However now when i start it I have 30 psi of fuel at idle... then when I give it gas the fuel pressure goes down to about 25. When I unplug the vacuum signal line now, nothing happens to the pressure. WTF!!!! Anyone know what the problem is? Is it because the T on the fmu instead of in the line? Is my sending unit just not reading right? This is getting old. By the way this is the Cartech BEGI fully adjustable unit.

Thanks in advance... heres a pic of it

i had the same problem.. hooked up the vaccum line to the bleed side instead of the feed side.

whats your email? ill email you a pic of mine if u need it?

gagt215@aol.com

But I have it hooked up right... dont I?

I think he's right i think its backwards.
Whats the check valve on the bleed line for anyway?

You guys could talk to me on AIM too... GAGT215 is my name.

This is what cartech's site says " There are two small hose fittings on the cap of the regulator. One of the two lines up and points directly at the screw in the center of the regulator. That is the signal line hose barb. The other fitting points in a direction askew to the centerline, it is the fitting for the check valve."

I have it hooked up that way as you can see above...

you got mail.. might have to check your junk box too. might have gotten filtered.

I got it... my fmu looks way different... i have an adjustment screw and what is that T on yours?

Well I lost that little restrictor I had before... I'll try finding it tomorrow. Grrr....

my cartech fmu looks different then yours. hmm

Yeah, my #2025 Adj FMU is a tad different alos, i would make sure you dont have a NA version of it, they make different ones with almost the same model # like the 2020 etc;

From what i can see is the only difference is the adj. screw on the side is where my bleeder nipple T's off of. Yours is right on the housing itself ..wierd. Like i said could be a different model or just a older one.

The checkvalve is too bleed off vacuum so the cartech doesnt read it. once in boost thats when it does something.

I dont think this matters a whole lot but they say dont make the bleeder line more then 3-4 inchs long in the directions.

try switching the feed with the bleed like the others ^ say.

Alright I figured it out.

I used thread sealer on the two adapters on the FMU itself. Well today I went to adjust the center screw today and i couldn't turn it... it was real hard. Well I got it loose and put it back in... voila. Works fine now. I have no FPR before this, this is my FPR. I havent driven the car yet, but when I start it I have 25 psi fuel and an a/f of 13 something, give it gas and the pressure jumps up to 40 psi. I have yet to see what it will do in boost... we'll find out maybe later tonight or tomorrow sometime.

Anyways the car starts up perfect and idles perfect now, so thats a plus. The FMU came from a hahn stage II turbo kit for the pt cruiser (I parted off my hahns kit from the pt) so it may be an older model, it is made for boost though, it was installed on the cruiser with no fpr as well.

Thanks guys, I'll let you know how the test drive goes
-Bob

Ok so I drove it and heres what happens... 25 psi no throttle, about 50 psi full throttle til about 3-4 psi, then it drops to about 45 and I go lean. I hate this car. Any suggestions? I had the bleed valve all the way closed also and a check valve on the vacuum barb opposite the signal barb... which way is the check valve supposed to go? Is the FMU supposed to be able to suck in, or blow out on that barb?

Thanks
-Bob

Actually i was wrong up above, the check valve should vent off boost. So the checkvalve wants to blow out into the engine compartment. So in other words attach the white end of the checkvalve to the vacuum line connecting to the FMU.

Since your fuel pressure drops when it starts to hit atmospheric, you should try turning the on set screw tighter.

Try going to Here to see if you got everything hooked up right and to double check your work.

Good luck!

I tried it each different way with the check valve today. I'll hook it back up tomorrow so the white is connected to the fmu (so it can blow off boost)

Everything else is hooked up right, and it felt good to drive the car again, but I want to lay into it and I cant (well safely anyways) until I get some decent a/f ratios here. So we'll see tomorrow what I can figure out. If I adjust the center screw, my idle fuel pressure is gonna be higher so I may idle a bit rich... oh well I guess. Once I get in the 40's at idle I'm off the scale rich and it smells like a boat motor... lol... I bet I still have a stock fuel pump which should be upgraded now. I will let you all know how it goes. Thanks for your help

-Bob

on my friends hahn kit , it is running no vacuum signal , and it gets the boost signal from the nipple on the turbo , and he had the signal line on the wrong nipple once , and the pressure readings sucked similar to yours


after i looked at it i moved it to the other port and it boosted the pressure up into the 90 psi range

Well I drove it again today with everything hooked up 100% correct. It jumps to 50 psi and as I get in boost it climbs slowly to 55 or so (it is rising the pressure with boost) but then theres nothin after that, no matter how I adjust it. So I did what cartech says to pressure test my pump... with the car running I pinched the return line completely shut... I have about 58 psi. SO... I'd say I'm in need of a new pump. Anyone else thinking that too?

Oh man this thing is going to fly when I have the balls to drive it hard. Wow... anyways yeah I need more fuel. Also, anyone know why my oil breather smokes ALL the time?

Thanks again everyone
-Bob

thats about right... the stock fuel pump can only flow so much. im hitting about 88 psi with an inline fuel pump.. plan in goign up a lil mmore when i up the boost.

Which inline pump are you using... the msd? I was thinking of ordering that one from summit.

i have the Hahnracecraft stage 2 kit