Can someone tell me how to shim my fuel filter. Where do I get the shim and what size do I use? Its my first mod, cant afford the downpipe yet or any of the other mods I plan on doing eventually. Thanks in advance. Ed 95 psd

 

OK Harley,
On the driver's side of the fuel filter there is a large brass nut/plug. Put some rags/towels/paper beneath so if you should drop something it will be caught. Also some fuel may dribble out.

Unscrew the brass plug, go slow as there is some slight spring pressure behind it. Remove the spring. Inside this "Hole" there is a triangular valve with a hole in the center where the spring nests.

Now...Take a "BB" from/for a BB gun. Nothing else but a BB gun BB. The BB goes into the little hole that the spring nest, the spring then "FOLLOWS" the BB.

Some have used a LITTLE grease on the end of the spring to hold the BB in place while seating the BB and spring.

On the inside of the Brass plug is a small "TIT". This tit will fit inside the spring and keep the spring centered while you apply inward pressure and thread the plug back into place slowly.

Viola.....you have just shimmed the fuel pressure regulator.

Now, what should have been said in the beginning you should have checked the fuel pressure to determine if the fuel pressure is low. This is done with a dial type air gauge, liquid filled is best but not mandatory.

Fuel pressure should be between 65 and 75#, no more than 80#

Rog

 

Well done Rog. Rep sent.

 

Thank you sir, I appreciate that.

Rog

 

i believe it is either 19mm or 3/4 inch plug. i used the grease trick to hold the bb on the spring.

 

Good job Rog, reps sent

I can't type as fast or as good as Rog but I can copy and paste
with the best of them Here a few picts:



This one is adjustable:

 

I'm with Cody. Good job Rog. Jim, you done good too. Reps all around.

 

Something happened to this thread when my dog jumped in lap. He's an 85-lb chocolate lab and when he needs to go outside, he needs to go now.

I don't know if I accidently clicked on the "Report Post" icon or not. If I did, I didn't do it intentionally. Webby, if there is a way to disregard the action, please do. I did not intend to report any of these posts.

 

Kudos for all you guys! Does my heart good when "Gurus" take the time to help out "Newbies" lol, even though I'm sure you've repeated this mod loads of times. Just wanted to say that. Drive safe all of you. Ed in CT

 

I dont understand the consept of inserting the BB.. is it lowering or raising the preasure? and why is it a good mod?

 

The BB is a SHIM and it increases the pressure by making the spring longer and creating greater pressure before the "Triangular valve" inside the regulator can open. If you had access to a longer spring with the same strength, that in its self would also do the same job.

If the spring slips off of the "TIT' on the back of the brass plug and the spring gets crushed the pressure will go through the roof. (100+#).
Don't ask me how I know.

Rog

 

Why is it important to raise the preasure above the stock settings? what are the benifits? as you can see, i am an idiot on the fuel filter subject..

 

hahaha

I dont see how it can slip off!
WTF did you do? :P

 

And is getting a longer spring alot more safer than putting a "BB" in it? especially to avoid slipage on the tit

 

OK, first OKGrowler's question:
Over time the pump gets weaker and this is an acceptable fix to bring the pressure back up to standards. Before you shim the regulator your pressure should be taken at the schrader valve to ascertain if in fact your pressure is low and needs to be raised.

Now Mr. Tayln:

Have you ever heard of Murphy's law? I don't think that I was paying attention and Murphy picked up on that. I played hell finding another OEM spring.

Rog