FPR shim?
 

ok, I heard of a mod called the FPR shim which is basically free and bumps up fuel pressure? i have not seen a how to or had this mod properly explained. Is it worth the effort?? Is it hard on other parts?? I dont want to put additional stress on other parts, just tryin to pinch pennies for performance and reliability.

Basically the FPR shim is to increase fuel pressure because after a while the Stock mechanical pump falls below desired and you want to keep it up around 60-70psi. Anything over 70psi will cause the pump to work too hard and could kill it. Take a tire pressure gauge and measure your fuel pressure at the Schrader valve on the side of the fuel bowl. It will spray fuel so be aware. If the pressure is lower than 40 then you can take a bb from a Red Ryder and put it inside the FPR and it will increase your fuel pressure. I have done it and mine is about 65 psi at idle... It wont gain you any power, just knowing that when you hit the throttle hard, you aren't spiking your fuel pressure too low.

my buddy did this on his 95 PSD and he said it starts alot easier and idles a little smoother. but that's about it...

i did it to mine 5 minutes is all it took and my fp went from 55 to 70

Yup, its not a HP mod, just something that can help with drivablity.

just replaced the lift pump and going to check fuel pressure....

A bb is free

FPR SHIM
 

Hi, well tried to do FPR shim,ground down screw to inside,took wire cutters to keep screw&nut
from moving,got pressure up from #40 to#50,tried adjusting screw a little, pressure went to #100. Pulled brass plug found spring bent into. When i was adjusting screw i went a quarter turn at a time and pressure stayed at #50,then went right to #100 with no small increases at
all,THE FORD FPR spring kit appears to be unknown to ford parts dept.

What do you mean "ground down screw inside"?

You just need to pull the brass plug, pull the spring and triangular shaped piece. Drop the bb in the triangular shaped piece, put the spring back in and put the brass plug back on making sure to center the sharp little point that's attached to the back of the brass plug into the center of the spring. Tighten the plug and done.

FPR shim
 

There are three ways of doing this one is to take and use a 4-40 screw&nut to make it adjustable, thats where grinding the head of the screw to fit into cylinder and if your pressure is not where it needs to be you can back the screw out until you get what you need.
Which i did,but somewhere it went down hill and bent the spring,now finding a spring is not going to be easy. Looks like i will have to buy a complete fuel bowl to get the spring.
The FORD spring kit appears to be not available.

Is it possible to do this mod without taking the FPR off
or is it easier to take it off.

Fuel Pressure Regulator Repair Kit (contains spring, valve spool & new brass plug)
(Ford) F5TZ-9K061-A (federal emissions; 94-98)
(Ford) F6TZ-9K061-AA (CA emissions; engine serial no. 201681-98)

Fuel Pressure Regulator Spring
(International) 1823643-C1 (federal emissions; 94-98
(International) 1825854-C1 (CA emissions; engine serial no. 201681-98

hope that helps you.

Just pull the brass plug, pull everything out that way like the pictures above show.

FPR SHIM
 

Thanks for the info. I was thinking that spring was like looking for hens teeth.

I've never heard of an ajustable screw mod... I used a 4-40 screw in my SD fuel bowl, but the way to adjust it was to grind the head of the screw down...

Interesting.

I don't think you can get just the spring, you have to get the whole kit. If you do that, get the california one, it has the higher pressure you are looking for.

FPR
 

Hi, i found a FPR kit at my local FORD dealer will run about $40.00. The spring by its self is like
hens teeth hard to find, the one will get in few days will be the CALI. one

old thread.. but what is the difference in pressure between using the reg spring and the cali kit? also, what was the outcome and resulting pressure / idle like once you changed them?

it would be much better for everyone if people that have this knowledge post the details for the rest of us...

reason i ask is because i recently changed my fuel pump and rebuilt the fuel bowl as well. the first couple days after the trucl idled extremely smooth instead of shaking at every red light. that didnt last though. 2 or 3 days later it was right back to shaking.

i know my status says newbie, but i belong to anther powerstroke forum, and im getting tired of people telling me to just google eveytime i ask a question there. i wind up having to search 5 other powerstroke forums for an answer and it defeats the purpose of me even asking in the first place.

FPR
 

HI,kctyphoon,Sorry about not posting results from CALI spring kit,pressure went up to 65psi.
But after replacing HPOP trany went out and at 271,000 miles got tired of sending good money after bad,so scraped the truck. because the next thing we were looking at was engine going bad could not afford anymore lessons,THANK'S

wow.. sorry to hear about the truck, but thanks for the reply.. im just getting really frustrated with forums lately. i know what its like though.. everytime something breaks its always "cheaper" to fix the one thing than having to buy a new car, but then after a bad year or two you wind up throwing away what could have been the payments on something new, or at least newer.. again - thanks for the response..

if you dont mind one more question, did it make a big change with your idle? i have to check my pressure .. my idle is really starting to piss me off.. along with the 5 other projects i need to do with this truck.

FPR
 

HI,It seemed to smooth out a little,but like i said 271,000 miles did not help.
The one thing that i thought was strange was when i changed the HPOP was it only took two
turns of the engine to start and did not miss a lick i had read somewhere you had to drive it
for sometime to get the air out of the system,THANK'S

a 7.3 crapping out after 270k? what was wrong with it? i know 7.3s can and do only last 100k miles but some go 500k+ with no problems. Just curious to what happend to the motor?

FPR
 

IT was one little thing after another trany going out was the final straw it was also our only vehicle and could not see wasting anymore on it

the 7.3's that only last 100K is because of maintenance. if you take care of it, they'll run forever. that goes for just about everyhing.

oh ok i hear ya, I agree with you fordornothing, iv seen people who own 7.3s and they dont give a crap about the maint! sometimes i just want to ask those people if they will give me the truck if they are just gonna tear it up and dont care. Its mostly dumba$$ kids who dont even know how to drive a truck:argh:

FPR
 

The fuel pressure went from 40# to65#,as for the maintaince $85.00 for amsoil+2 filters twice a year +oil,amsoil in trany every other year then still goe's bad,then to teach us a lesson was
turning truck around and steering shaft breaks off in garage new steering box,injectors going bad if you do not have the tools or do not know how to change them FORD garage wanted $750.00 for 1 injector,like i said you have to cut your loses at sometime,THANK'S:s: