| Go back to previous topic | | Forum name | Turbo/Nitrous Tech | | Topic subject | Shakey FP gauge needle, SFMU not working | | Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i8&topic_id=76245 |
76245, Shakey FP gauge needle, SFMU not working
Posted by Semperboost, Sep-08-04 08:35 AM
I have the SFMU (Dark Spring, 2.72 disk) T'd off is a B&M fuel pressure gauge. Anyways at idle the needle shakes at around 20-22psi, after I let off the gas it goes to 18psi. I thought it was the gauge but when I turn it to ACC the gauge does not shake but just goes into the normal cycle of going to about 30psi then slowly drops off. Another thing I notice is that my FP gauge used to drop to 0 after I turned off my car and now it goes to 5psi then slowly to 0. Also when I boost my car used to run good, with the restrictor inline, running about 55-58psi @ 7lbs now it runs like 60+psi @ 4psi and even not in boost fuel pressures are way high. I checked the rubber return line for bends or kinks, but nothing, I gonna get it replaced with a hardline soon. I also checked the feed line and vaccumm lines..vaccumm is around 15Hg at idle (my GReddy BOV diaphram is torn a little) Can anyone help out? Thanks
Alvin
96 RST
http://www.imagestation.com/mypictures/inbox/view.html?id=4193961127&url=http%3A%2F%2Fwww.imagestation.com%2Fpicture%2Fsraid99%2Fp45653afedba6629e15fd2139c2f81811%2Ff9fac4a7.jpg&caption=old%20029
Star turbo kit /Starion FMIC / 30lb injectors/ SFMU/ GReddy Type-S BOV/ APEXi World Sport Cat-back / MP 60mm TB/ Joe P BC / Southland Dual Friction clutch/ Prokit/ Tociko Blues/ GST rear swaybar/ B&M Shortshifter/
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76248, RE: Shakey FP gauge needle, SFMU not working
Posted by admin2, Sep-08-04 10:05 AM
Sounds like a kinked return line to me...
BTW - your Greddy BOV having a worn/torn/split diaphram won't cause low idle vacuum ;-)
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76270, RE: Shakey FP gauge needle, SFMU not working
Posted by Scandelous, Sep-09-04 03:53 AM
Originally posted by admin2
Sounds like a kinked return line to me... BTW - your Greddy BOV having a worn/torn/split diaphram won't cause low idle vacuum ;-)
What he said. ^^^^
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76271, RE: Shakey FP gauge needle, SFMU not working
Posted by etx, Sep-09-04 04:13 AM
Make sure the fastners on the SFMU are torqued properly and that it's not leaking vacume.
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76285, Another question...
Posted by Semperboost, Sep-09-04 09:34 AM
I'm gonna run alluminum tubing to the hardline of the top of the tank...now how would I attach that? A simple hose that's bigger than the two?...but I can't really torque it down on the alluminum pipe cuz isn't that too soft that it might crush it? THanks
Alvin
96 RST
http://www.imagestation.com/mypictures/inbox/view.html?id=4193961127&url=http%3A%2F%2Fwww.imagestation.com%2Fpicture%2Fsraid99%2Fp45653afedba6629e15fd2139c2f81811%2Ff9fac4a7.jpg&caption=old%20029
Star turbo kit /Starion FMIC / 30lb injectors/ SFMU/ GReddy Type-S BOV/ APEXi World Sport Cat-back / MP 60mm TB/ Joe P BC / Southland Dual Friction clutch/ Prokit/ Tociko Blues/ GST rear swaybar/ B&M Shortshifter/
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