shimming fpr
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
CLICK HERE for a reference picture.
You want to add a 3/16 ball bearing to the FPR. Check you Fuel pressure at the schrader valve (bicycle tire looking thing) before and after the mod. It's removed in the picture, just leave it in the FP housing. More than 75 psi may cause trouble. The fuel pressure gage will bounce quite a bit, just use the middle of bounce for you readings. You will see what I mean.
I don't remeber where I got this pict so thanks to the member I stole it from.
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You want to add a 3/16 ball bearing to the FPR. Check you Fuel pressure at the schrader valve (bicycle tire looking thing) before and after the mod. It's removed in the picture, just leave it in the FP housing. More than 75 psi may cause trouble. The fuel pressure gage will bounce quite a bit, just use the middle of bounce for you readings. You will see what I mean.
I don't remeber where I got this pict so thanks to the member I stole it from.
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>
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Last edited by Cuda_jim; Oct 7, 2006 at 11:18 AM.
Posting Guru
Joined: Oct 2003
Posts: 1,955
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From: Quesnel, BC, Canada
awsome pic....worth 1-million words, give or take a few.
I forgot who used a cotter pin....but would you just slide the shaft up inside the spring so the head's poking out? Should I try a bobby-pin?
I dont have any BBs or cotter pins, or a BB gun so im not going to buy a pack of BBs
I forgot who used a cotter pin....but would you just slide the shaft up inside the spring so the head's poking out? Should I try a bobby-pin?
I dont have any BBs or cotter pins, or a BB gun so im not going to buy a pack of BBs
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Logistics Pro
Joined: Apr 2004
Posts: 4,292
Likes: 5
From: NJ where fun comes to die
If I might Hijack this a bit.........
Does shimming make the engine run hotter?
Will a fuel pressure gauge from a gas engine work?
Thanks
Does shimming make the engine run hotter?
Will a fuel pressure gauge from a gas engine work?
Thanks
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
You must check the FP w/ the engine running, our PSD's have mechanical pumps.
Shimming the fuel pressure make the engine run better and could make it run a little hotter on the EGT's, nothing to worry about. A good set of gages removes all doubts. You need gages if you are going to mod your truck.
A fuel pressure gage from a gasser will work as long as it goes high enough. The needle bounces alot so you need one that reads ~90+ psi. A dial type bicycle gage will work too but, The bike gage might leak fuel or get trashed though.
Shimming the fuel pressure make the engine run better and could make it run a little hotter on the EGT's, nothing to worry about. A good set of gages removes all doubts. You need gages if you are going to mod your truck.
A fuel pressure gage from a gasser will work as long as it goes high enough. The needle bounces alot so you need one that reads ~90+ psi. A dial type bicycle gage will work too but, The bike gage might leak fuel or get trashed though.
Last edited by Cuda_jim; Oct 8, 2006 at 12:15 PM.
Senior User
Joined: Dec 2006
Posts: 254
Likes: 0
What RPMs are we talking about. I would assume idle.
Does any one have a graph or approximate number for Fuel pressure vs. RPMs.
Does any one have a graph or approximate number for Fuel pressure vs. RPMs.
Originally Posted by RÖENTGEEP
I have read that 70 PSI is the magic number, and never more than 80 PSI. and yes, first check it before do anything and after that.