Durabill said:
I remember a thread on this web site that lists GM part numbers from a larger truck that will work on a 2500HD that will give a bigger fill pipe that will work well.
It does not work, I tried it. Now I have $45 filler that can be used as a paper weight.
The filler(GMs fo the 4500s) is just like the Fords and TransferFlow, it uses a fill vent that is on the outside of the fill tube. Then is goes back into the tank for venting(fill). This gives you more area on the inside of the fill tube for FUEL. I want to check out the LLYs and see if it is the same set up.
The TransferFlow works better but it is not a true fix to the problem. I think the angle of the fill tube is to much. The pump will always click off until the handle is in the correct possition.