I have heard from a buddy that worked on cummins engines and he said the only difference between like a dump truck cummins engine and a street drive pick up is this little pill in the fuel pump. He said what the pill does is hold fuel back or lets it go. I was wondering if anyone had heard of this "pill" thing.

 

ive never heard it called that but it sounds like he is talking about the fuel plate which all engines have from the factory but if you remove them or modify them, you can get alot more fuel out of it with everything else the same.