Fuel Pressure Regulator?
- Thread starter ikle
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mikestertwo
Well-Known Member
- Joined
- Sep 13, 2006
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- 5,249
Is the fuel pressure regulator supposed to hold vacuum? I have 2 of Kirban's billet FPR and neither of them hold vacuum.I would think they are supposed to,but not sure,wondering if these FPR are any good.Thanks,ikle.
They should hold vacuum.
when I hook up a might vac directly to the FPR vac port it bleeds down,fuel pressure is at 43# line off,vac is at 17inHg when I put vac line on fuel pressure drops to 38#.Even if I put fuel pressure to 39#,line off, it only drops to 38# vac line on.So I thought the FPR was going out since it was 6 years old so I purchased another one from Kirban and put vacuum to it and it doesn't hold vac either.Wondering if I should invest in a different make of FPR.Thanks,ikle.
Just a Six??
OK! Who Farted??
- Joined
- Jul 4, 2003
- Messages
- 3,574
43 to 38 sounds about normal & you say 39 to 38 but I'm not sure how they work after you lower to a certain point? The 17" vac on guage is good. Seems it works fine at 43 & since thats what we generally use it sounds good. Make sure fuel rises 1 lb per lb of boost & if so you should be ok I think.
For a test adjust from 39-40-41-42 etc & see if they all drop to 38 & if you still have the 17" on guage.
For a test adjust from 39-40-41-42 etc & see if they all drop to 38 & if you still have the 17" on guage.
I just did a pressure test on the FPR and put it under water and it is leaking at the threads of the adjustment screw.Does any one know how I can seal up the threads and still be able to adjust fuel pressure.The FPR has a nylon washer under the nut which I guess is there to seal the FPR but isn't working to well.I am going to see if I can find a rubber washer to put under the nylon washer to see if it helps,but would like to seal up the threads them self for a worry free seal.Any suggestions would be great.Thanks,ikle.
Good news guy's I got rid of the plastic washer that the regulator came with and replaced it with a neopreme washer and a regular washer I bought from Home Depot, that took care of the leak at the adjustment screw.I put the regulator back under water and to my surprise it was leaking at 2 of the screws that hold the 2 billet pieces together,a little thread sealer on all of the screws threads took care of it.Now it holds vacuum,and again thanks for all the replies,ikle.
