I have 42lb injectors, in-tank and inline fuel pump, S-FMU with 2.72 disk and dark spring. I set it up just like the sfmu instructions say and when i turn the screw on top of the lid it will go up from 23, but it will not go down. I am trying to get it to 20psi idle pressure just so i know i can adjust it that low but it will not let me go lower no matter how much i adjust the screw. Also, when i turn the key to on, but not crank it up, my fuel pressure gauge goes crazy and the needle wiggles alot, should i be worried about that. Do i need to change my fuel filter or is it alright. Thanks in advance.
99 RS-T "New bottom end(8.6:1 w/long rods)" Turbonetics 60-1/Portfueler/etc!!!!!
#74132, "RE: SFMU setup problems?" In response to Reply # 0
change your spring for one, go the the softer spring, you will be able to go to 20 easily. as for your on priming pressure not sure, poss gauge issue, could be a lot of things. exactly how is the sfmu setup....plumbing ect.
Terry
96 Eagle talon ESI Star Stage II - Boost/oil/EGT gauges
#74136, "RE: SFMU setup problems?" In response to Reply # 1
Originally posted by Star Turbo Talon change your spring for one, go the the softer spring, you will be able to go to 20 easily. as for your on priming pressure not sure, poss gauge issue, could be a lot of things. exactly how is the sfmu setup....plumbing ect. \
he is using the correct spring. the dark spring is the one to use for lower pressure.
#74134, "RE: SFMU setup problems?" In response to Reply # 0 Jul-19-04 05:54 PM by XtremeRS
Originally posted by freddy_00_69 I have 42lb injectors, in-tank and inline fuel pump, S-FMU with 2.72 disk and dark spring. I set it up just like the sfmu instructions say and when i turn the screw on top of the lid it will go up from 23, but it will not go down. I am trying to get it to 20psi idle pressure just so i know i can adjust it that low but it will not let me go lower no matter how much i adjust the screw. Also, when i turn the key to on, but not crank it up, my fuel pressure gauge goes crazy and the needle wiggles alot, should i be worried about that. Do i need to change my fuel filter or is it alright. Thanks in advance.
Do you use a mechanical or electrical gauge? When you turn the key to on the pumps should "prime" for a second or so,then shut off until you turn the key to "start". Thats normal and should happen. When its priming, it will prob build pressure, so your gauge is just reading that pressure most likely. And be sure you wired your fuel pumps with a heavier gauge wire using a relay and wired from the battery. The stock wiring wont handle the extra load of an inline and intake pump very well..
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#74139, "RE: SFMU setup problems?" In response to Reply # 3
the vortech instructions statethe spring that comes installed will adjust from 5-40psi and the dark hard spring will adjust to 50-60 static pressure. I tried using the silver on mine and the highest it would go is 39psi. i had to install the dark spring for 50psi
look at your instructions from yours
Terry
96 Eagle talon ESI Star Stage II - Boost/oil/EGT gauges
#74143, "RE: SFMU setup problems?" In response to Reply # 9
well when i installed it the adjustment screw was all the way out. and it was hardley reading on my fp gauge. i know the gauge is good, it a snap on and hasnt been used but a few times and no never dropped it . I had to crank it all the way down to get 39~40 psi out of it.
unless i have a screwed spring, not sure why its different Terry
96 Eagle talon ESI Star Stage II - Boost/oil/EGT gauges
#74147, "RE: SFMU setup problems?" In response to Reply # 11
the reason he can't get it down past 2opsi is probably because he is still using the stock return line back to the tank, it happened to me so i switched over to a bigger return line the preassure dropped all the way down too 8psi
#74150, "RE: SFMU setup problems?" In response to Reply # 13
Thanks for all the advice. I will check both springs. I have a relay for the inline pup, so they are working great. I have a stainless steel braided return line and it is bigger than stock, so that was done when i installed the fuel systme setup months ago. I will try some more things today so i will post again. Thanks and i will try the sofetr spring just to check it out.
99 RS-T "New bottom end(8.6:1 w/long rods)" Turbonetics 60-1/Portfueler/etc!!!!!
#74152, "RE: SFMU setup problems?" In response to Reply # 12
Originally posted by Tommyboy the reason he can't get it down past 2opsi is probably because he is still using the stock return line back to the tank, it happened to me so i switched over to a bigger return line the preassure dropped all the way down too 8psi
Only 95's will have a "stock return line" though. 96+'s will use some aftermarket variation, unless you have the vacuum line running to the rear. In that case, I guess you would have a stock return line, albeit short as heck.
_____________________________________ Jason ESi-T
04' BMW 325Ci 91' Nissan 240SX 98' Eagle Talon ESi (sold)
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. I had to crank it all the way down to get 39~40 psi out of it.