I always had problems with my fmu breaking diaphragms and what not....and i noticed tons of other people were going through the same thing. I couldnt find any topics on solving the problem either. Well i finally solved the problem, and it was right in my face. Everyone using the fmu setup make sure you are using the STOCK FPR. Using an aftermarket one like the B&M, aem...etc flows too much fuel to the fmu causing it to bust a hole in the diaphragm. The fmu isnt designed to work with an aftermarket regulator, but the OEM fpr. Just wanted to post this up for all you guys with fmu problems all the time. Sean 4dr gsr 10lbs

 

Im running a fmu with a intank pump and b&m if i put the stock fpr on wont my **** run like *** since im not using a inline pump.

 

nope. I have a BBK 250lph intake and stock fpr with an 8 to 1 disk and i dont have one problem whatsoever

 

Use an inline if you dont have an intank. If you have an intake pump you shouldnt need an inline unless you plan on running very high psi of fuel. The intank pump and stock fpr is how the fmu is designed to work.......it works with the stock fuel pump but obviously it isnt going to flow enough for the fmu.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by steroidguy &raquo;</TD></TR><TR><TD CLASS="quote">Use an inline if you dont have an intank. If you have an intake pump you shouldnt need an inline unless you plan on running very high psi of fuel. The intank pump and stock fpr is how the fmu is designed to work.......it works with the stock fuel pump but obviously it isnt going to flow enough for the fmu.</TD></TR></TABLE>
I got a walbro high pressure 255 intank pump and the fmu is a 12:1 disk so if i use a stock fpr how will it run.

 

The B&M regulator was not a problem, but when I put on an SX regulator - my FMU met an untimely death. I'm guessing the -6 an fuel line I ran from the SX to the FMU flowed too much fuel into the FMU and destroyed it. Another thing to watch out for with Vortech's is when changing the calibration disk; DO NOT overtighten the six allen screws that hold the cap on. It will break the diaphram. They only need 2 ft. lbs. which is like a little snug. Beside those problems, FMU's were always

 

FMU is made for the stock fpr......the minute i swapped out the B&M it worked like a charm. With the B&M i was busting diaphragms all day

 

JAPSPEC: It isn't that you car will run BETTER but that you will save yourself a lot of hassle with those diaphragms. Otherwise you will have problems like most people do....which is one reason why i think fmu's have a bad rap

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by steroidguy &raquo;</TD></TR><TR><TD CLASS="quote">JAPSPEC: It isn't that you car will run BETTER but that you will save yourself a lot of hassle with those diaphragms. Otherwise you will have problems like most people do....which is one reason why i think fmu's have a bad rap</TD></TR></TABLE>
Thanks and that makes sense.

 

dont use just an in-tank pump with just an fmu (esp 12:1)..It will simply not flow enough fuel...(wideband verified btw)...just my .02

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99lspwr &raquo;</TD></TR><TR><TD CLASS="quote">dont use just an in-tank pump with just an fmu (esp 12:1)..It will simply not flow enough fuel...(wideband verified btw)...just my .02</TD></TR></TABLE>
I hear you but my car seem to run well no bogging or pinging but then again im only boosting 7 lbs but only seeing 5.5 after intercooler.

 

I ran my fmu for a year with the aem fpr and I didnt break any diaphrams...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99lspwr &raquo;</TD></TR><TR><TD CLASS="quote">dont use just an in-tank pump with just an fmu (esp 12:1)..It will simply not flow enough fuel...(wideband verified btw)...just my .02</TD></TR></TABLE>
This makes sense but if you use a warblo 255 HIGH PRESSURE intanke then you will have no problems! The regular 255 is not make to climb in pressure so quickly but will still produce 255 lbs of fuel pressure. I myself am using a regular warblo 255, 12-1 FMU and B&M at 60 static lbs of pressure(just temperary)(NOT recomended) and am haveing absoultly NO problems and that is also confirmed on my inovative WB and also checked with a fojo. I am runing pretty rich to be on the safe side till I get my EDM urberdata chip up and runing. Then comes the aeromotive fpr and the rc 550's.

 

i thought FMU's r supposed to be used with inline fuel pump that is why the drag kit comes with one to run on stock injectors.......

 

a lot of mixed opinions in here.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BVM &raquo;</TD></TR><TR><TD CLASS="quote">I ran my fmu for a year with the aem fpr and I didnt break any diaphrams...</TD></TR></TABLE>

i thought you had a problem with the aem fpr

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by steroidguy &raquo;</TD></TR><TR><TD CLASS="quote">FMU is made for the stock fpr......the minute i swapped out the B&M it worked like a charm. With the B&M i was busting diaphragms all day</TD></TR></TABLE>

Well I don't know what to tell you. I've been using my aem fpr with my fmu for about 2 years now and i had a b&m for about 2 years before that with no problems, same fmu....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SIK IN DA HED &raquo;</TD></TR><TR><TD CLASS="quote">a lot of mixed opinions in here. </TD></TR></TABLE>

exactly and until then itz still up in the air

 

no truth?

 

i don't see a problem using an adj. fpr.

with the walbro intank 255lph, it raises your fuel pressure and you'll need an adj. fpr to lower the fuel pressure back down to stock settings.

 

this thread makes no sense. the fmu is not designed for our fuel system or motors, they are universal. Most larger motor'd cars flow a lot more from the return than hondas and the FMUs must be designed on some level to accomidate that.


Modified by 94goldjungsr at 4:51 PM 11/20/2003

 

so pretty much the fpr, stock or aftermarket, has nothing to do with the fmu messing up?

 

it makes no sense why it would.

 

thats what i thought