I'm running a d16z6 turbo
walbro 255lph high pressure pump
vortech 10:1 fmu
synapse missing link
everything else is stock as in injectors,rail,regulator and what ever else.
But the problem im having is 70psi fuel pressure at idle and stumbling at vaccum to boost crossover?
Things I have already checked filter,return line,regulator and can't figure it out let me know what you think. Thanks in advance

 

ttt

 

i am pretty sure there is only one way the fmu can go on. make sure the lines arent crossed.

 

That walbro pump is probably pushing way too much fuel for the stock regulator to handle...hence the high fuel pressure.

Still...usually people see about 50 psi at idle...not 70. It sounds almost like the FMU is stuck. Bypass the FMU and see what your fuel pressure is. You do this by taking the fuel return line from the stock FPR and routing back to the tank (like stock). With an FMU, the return line goes into the FMU, and then from the FMU to the tank.

Sonny

 

I have tried that already and I even run a hose off the regulator to a gas can to see if that would make any difference and it only dropped it to 60psi

 

the fmu is hooked up right

 

It's the pump, man. Get an FPR like the AEM.

Sonny

 

I got the pressure down to 50psi by drilling a hole in the inside the reguletor and I still have the cutting out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohcturbocoupe &raquo;</TD></TR><TR><TD CLASS="quote">I got the pressure down to 50psi by drilling a hole in the inside the reguletor and I still have the cutting out.</TD></TR></TABLE>
I did that a long time ago but got tired of priming the engine everytime I wanted to start it. I went with a aem fpr used the largest oriface and solved the problem. Oh yeah mine had the same problem, it's due to your fuel pump pumping more fuel then your fpr can handle.

 

How big of a hole did you drill?

I drilled a .062" hole in one of the FPRs that I had and noticed that the fuel pressure started acting really strange under boost. Be careful.

Sonny

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sonny &raquo;</TD></TR><TR><TD CLASS="quote">
How big of a hole did you drill?

I drilled a .062" hole in one of the FPRs that I had and noticed that the fuel pressure started acting really strange under boost. Be careful.

Sonny</TD></TR></TABLE>

I don't recall, it was a few years ago when I did that. I've since moved on to a better form of fuel control