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I think you were turning the adjusting screw the wrong way. Looking at it from the front of the truck you should turn it clockwise. The screw is a 3/32 allen set screw. The cover over this screw "cap" is 7/16 wrench. And the lock nut is 7/16 also. PK if you like PM me and i'll give you my # and...

If you back off of the fuel rate does it stop leaking? Have you removed it? How did your truck run after you increased the rate?

I know, And you way works also. Bret at boyce equipment showed me how to do this a few years ago. I've used this method on my truck and all of my fire dept trucks. with great results. espically for people who aren't experenced with IP's. Using the TM's way works also but is much more complacated.

The cover you need to remove is round. a 7/16 whench fits it. If you look at pic#1 westech posted it's just to the right of the fuel line comming into the hyd head. This round piece is silver and about 5/8 inch long. It's mounted on the VDC.

Yea , what you are looking for is a silver colored (if it's not painted) round cap. IT's about 1/2 inch dia pointing twards the radatior. It's on the viscosity dinsety compencator. Just behind the distribtor head where the injector lines go to the pump. It should have a small wire seal going...

When you turn up the fuel rate make sure you have the engine up to operating temp. And change all three fuel filters. If you use dirty filters and turn it up when you change filters the difference in back pressure will change the setting. After the engine is warm remove the cap H R D mentioned ...