variable pressures with fpr shim - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 03-05-2008, 06:15 PM Thread Starter
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variable pressures with fpr shim

Greetings! I am new to this site and I have enjoyed all the great info that is available. I have not filled out my bio but that will come. I am working on my FPR shim with a gauge. I installed the gauge before I added the shim just to see what my starting pressures were and the gauge would pulse from @ 60 to 80psi. I bled off the the schrader thinking maybe air or something had caused this but it did not change. I then went ahead and put the shim in and I basically had the same results. The shim is 3/16. Overall the truck idled just fine at both settings. What I am wondering is.. does this tell me something about the fuel pump? Nothing changed when I gave it a little throttle. The gauge is from Grainger. It is 0-100, liquid filled. Any advice? Insight? The truck is a 97 1 Ton. PSD of course. Thanks!
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post #2 of 7 Old 03-06-2008, 06:30 AM
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i did mine last weekend i didnt check my pressure before starting but when i got done it was running about 62/70 psi i used the bb and it smoothed out my idle a bunch. id probable watch it for a while and if no probs i wouldnt worry about it. dont know a bout fuel pump so maybe some one will chime in that does.

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1995 f350 standard cab 4x4 193,000
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fpr shimmed with gauge
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post #3 of 7 Old 03-10-2008, 12:25 AM Thread Starter
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Variable fpr pressures

If the fuel pump is mechanical vs. electrical would that account for the variable readings? If so is there a dampener or buffer one could use? THANKS!
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post #4 of 7 Old 03-10-2008, 06:19 AM
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i bought a better gauge and the needle stays on 62 lbs. no bounce. i got a 25.00 liquid gauge from an irrigation shop.like i said before dont know about the pump.

2002 f350 c/c lb 4x4
afe stage 2 pro guard 7
superchips tuner
4" straight pipe 5" tip
zoodad mod.
foil delete
new valve body and convertor
dent in front bumper from wife

1995 f350 standard cab 4x4 193,000
diy intake
fpr shimmed with gauge
3" dp into 4" straight pipe with 5" tip
train horns soon!!!!

2000 excursion limited
superchips tuner
afe stage 2
4" turbo back
4" lift on 35s
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post #5 of 7 Old 03-13-2008, 11:58 AM
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marc, do you know the brand/part number of the gauge?

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post #6 of 7 Old 03-14-2008, 06:13 AM
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Quote:
Originally Posted by cotton View Post
marc, do you know the brand/part number of the gauge?
the only thing it sayed on the box was hecho en mexico. do you have a hydrolic shop around? if so go there they got the gauge youll need , i spent the extra money and got a stainless. if you need help i can get u one.

2002 f350 c/c lb 4x4
afe stage 2 pro guard 7
superchips tuner
4" straight pipe 5" tip
zoodad mod.
foil delete
new valve body and convertor
dent in front bumper from wife

1995 f350 standard cab 4x4 193,000
diy intake
fpr shimmed with gauge
3" dp into 4" straight pipe with 5" tip
train horns soon!!!!

2000 excursion limited
superchips tuner
afe stage 2
4" turbo back
4" lift on 35s
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post #7 of 7 Old 03-14-2008, 06:40 AM
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97 has a mechanical pump, I have only worked on the newer 99-03 trucks with electrical pumps and the pressure is stable no matter engine rpm or if the engine is even running. I imagine the mechanical pumps will be much less stable and changed based on rpm. Maybe someone with OBS experience will chime in.

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