I have looked all over for any info on how to do the optic bump. Any info or diagram would sure help. My ip is a 5068. thanks, roger.st

Avoid changing the optic sensor on your 5068. These pumps are just too touchy to try and adjust on the truck.

Check Fuel Rate at low idle and I think you will see it is already on the low side (5-7mm) at hot idle.