hyabusa hunter

hey all,
ive just installed a A1000 with -10 lines precision 1000cc, aem fuel rail,AEM fpr,

i cant get the fuel pressure lower than 60psi at idle, i have checked the diaphram and its all good. the FPR is only 2 months old

why so high fuel pressure? this cant be good? any thoughts welcome

Mikey3000

How did you check the diaphram? It must be the fpr.

hyabusa hunter

i opened up the regulator and checked the diaphram for any holes or damage, looked brand spankinh new, it wasnt brittle either like some diaphrams go after a while, so im still stuffed why its so high?

hyabusa hunter

im running a -6 return line, is that to small?

Mikey3000

no i'm running a -6 return as well. matter of fact i have the same fuel setup you do except i have an SX fpr and STR fuel rail.

hyabusa hunter

this my fuel setup maybe the problem?

im running a swirl tank in the boot, the walbro fills the swirl pot and the A1000 comes off the swirl tank, there is a return line from the swirl tank to the OEM fuel tank so the swirl tank does not get pressurised, the return line from the FPR returns to the swirl pot to, do you think this maybe cause the high pressure, having it return to the swirl pot first instead of the OEM fuel tank? or should the return line go straight to the OEM tank?

SOHCD16y8

Thats very possible, I dont know how you have your system setup but I would disconnect the return and run it to a bucket or something and see if this lowers the pressure. If it does then it is the swirl tank that is causing the problem.

DaveF

sounds right. (return/swirl tank setup)

SOHCD16y8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">sounds right. (return/swirl tank setup)</TD></TR></TABLE>

Thats what I was thinking, but I just dont know what else could be causing it if the FPR is working properly as he says.

hyabusa hunter

so run the return line from the FPR to the OEM tank instead of the swirl tank, but also run a return line from the swirl tank to the oem tank so that does not pressurize either..................

hyabusa hunter

bump

hyabusa hunter

just an update, problem solved!!!! put the fuel return to the OEM tank, then put a return from the swirl pot to the OEM tank, fuel pressure stable and consent at 38 psi!.............................................. ................. SWEET dyno here we come!!!!!!!!!!!

tony1

I'd be worried about keeping the surge tank full like that. I'd think the regulator return would need to go to the surge tank first, like you had it originally. Maybe all your return lines and line from the surge tank to the oem tank were too small?

hyabusa hunter

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">I'd be worried about keeping the surge tank full like that. I'd think the regulator return would need to go to the surge tank first, like you had it originally. Maybe all your return lines and line from the surge tank to the oem tank were too small?</TD></TR></TABLE>

i disconnected one of the hose connected to the surge tank, put the ignition switch on and it shoot fuel out at least 8 foot away, all the return lines are -6, you must remember the walbro will flow tons more becuase its not under pressure anymore, so keeping the surge tank filled does not seem to be a problem, but i get your point, i maybe should have run larger return lines in the 1st place.