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Old 02-15-2008, 02:21 PM
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FPR shim

well i did the FPR shim today becouse my psi is about 56psi and would like closer to 65 psi. i used a BB and did eveything i was suspose to do,made sure the spring didnt get messed up or anything. got in the truck and my psi went up to 100 psi. so i took it apart and did 3 other time, tried differnt bb's and still hit 100psi. just wondering if i did something wroung. i took it out now becouse i no a 100 psi would likely scew something up. has anyone else had this problem. can i do anything else to achevie 65 psi?
thanks
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Old 02-15-2008, 02:26 PM
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Yeah.......I have read where you can use an allen head screw and grind the head down until you achive the desired pressure. I guess the threaded part of the bolt slips in the spring. Do a search I'm sure you will find something.
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Old 02-15-2008, 02:35 PM
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yeah i fourd the one two. i just dont have access to a grinder so that why i was trying the bb, but i dont no if that would either becouse i dont no if u could grind the head smaller then the size of a bb.
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Old 02-15-2008, 02:48 PM
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What year you got? Are you sure the bb is resting somewhat inside the opening of the spring? I took my fpr completely off so I could get it right. That way you can just drop the bb in and place the spring on top if it, also get the point in the middle of the brass bolt centered into the spring. Also clean the screen while you have it out, don`t forget the o-ring on the screen and the brass bolt if you decide to go that route. The bb size to use is 0.177 or 4.5mm which are the same.

Last edited by Triflex; 02-15-2008 at 02:55 PM.
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Old 02-15-2008, 03:20 PM
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i got a 2000, i took the cover off then pulled the spring and the brass thing out, place the bb down in the brass thing and put the spring back in and put the cover back on, and made sure the spring was in the center of it, then put the cover back on.. it seamed like it had alot of tension on it.
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Old 02-15-2008, 03:24 PM
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Pull the spring out, leave the brass thing in. Put a tiny bit of grease on the end of the spring and then stick the BB on the end of the spring. The grease acts as a "glue" to hold the BB so it won't fall off the spring while installing it. Then insert the spring inside the FPR mechanism in the bowl with the BB headed outward. The BB wants to be touching the FPR cap (the one that has the 2 torx bolts holding it on the bowl). If you do that, it should be fine.
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Old 02-15-2008, 03:27 PM
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i put the bb between the spring and the aluminum cover, i dont know if it would make any difference but id try it that way, spring,bb,cover(cap) and be careful when tightening the fuel line back onto the cap, if you tighten it to much you may crack the threads!
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Old 02-15-2008, 03:32 PM
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OK the hole the bb goes in is actually two holes. A big opening where you start to screw in the brass bolt. down inside and at the bottom of that is a smaller hole and it has a lip so if you don`t take the fpr off you will have to take a small screwdriver etc. to push the bb into the small hole then the spring also goes inside the small hole and sits there thats why you then have to line up the center of the bolt within the center of the spring to keep everything straight. If you are not having issues w/your truck, idle,throttle etc. I would forget it.
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Old 02-15-2008, 03:34 PM
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I like the grease way PSDfan99 does it. much eisier.
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Old 02-15-2008, 03:34 PM
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Quote:
Originally Posted by Triflex View Post
OK the hole the bb goes in is actually two holes. A big opening where you start to screw in the brass bolt. down inside and at the bottom of that is a smaller hole and it has a lip so if you don`t take the fpr off you will have to take a small screwdriver etc. to push the bb into the small hole then the spring also goes inside the small hole and sits there thats why you then have to line up the center of the bolt within the center of the spring to keep everything straight. If you are not having issues w/your truck, idle,throttle etc. I would forget it.
The FPR design is different on the OBS trucks like yours compared to the Superduties, if that is what your referring to.
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