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Unread 08-03-2007, 05:02 PM   #1
lopezzi
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1983 CJ7 
 
Join Date: Oct 2006
Location: Springfield, MO
Posts: 109
Fuel Pressure Dropping?

Hey everyone,
I have a fuel pressure regulator on my 83 CJ7 with a 258. When I first start my jeep, the pressure shows correctly at about 3.5 to 4 psi, but after running it for a while, like after it warms up, when I check the gauge, it will show almost nothing, maybe just a tad above 0 psi. My jeep still seems to run fine and I don't notice any change in the way it runs. Could I be actually losing pressure as it warms up, or is my FPR gauge not working correctly? Any ideas or other things I can try to see what's really happening?

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Unread 08-03-2007, 05:09 PM   #2
White92
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1984 CJ7 
 
Join Date: May 2007
Location: Boerne, Texas
Posts: 654
If the real pressure went down to 0 then it would stop running. Must be your gauge IMHO.

P.S. Where did you mount the gauge?
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Unread 08-03-2007, 05:12 PM   #3
Bard
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1985 CJ7 
 
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Not sure what you have for a setup, but IMO, I would say the guage is faulty by what you are saying. Only way to truely test it, is to pull it off and have it done at your local parts store. It sounds like my oil gauge, works great at start up at 55 and then drops to 20 or 0 depending on how much rpm's it is at.
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85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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Unread 08-03-2007, 05:23 PM   #4
lopezzi
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1983 CJ7 
 
Join Date: Oct 2006
Location: Springfield, MO
Posts: 109
Oh sorry, its late on Friday.

As far as my setup. I have a Webber 34 carb on there and pretty much the rest is stock. If you would like to see a picture, check this site:

http://home.apu.edu/~slopez/RegPics3/
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Unread 08-04-2007, 07:17 PM   #5
lopezzi
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1983 CJ7 
 
Join Date: Oct 2006
Location: Springfield, MO
Posts: 109
Anybody else have any ideas? I don't want to ruin anything by running it with low pressure if that is the case.
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Unread 08-05-2007, 06:53 AM   #6
Bard
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1985 CJ7 
 
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Try this - switch your return line and fuel line to the FPR. I think they look backwards.
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85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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Unread 08-05-2007, 02:20 PM   #7
lopezzi
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1983 CJ7 
 
Join Date: Oct 2006
Location: Springfield, MO
Posts: 109
Ok I will try that today. Just for reference though, I have the return connected to the offset of the fuel filter. The main fuel line is connected to the center. Is that backwards? And how would I have known that? I'm sure thats a noob question, but you gotta learn somehow right?
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