Has anyone drilled out the very small orfice in the banjo bolt that hooks the fuel line into the pump. The hole is so small I doubt a pin would fit through it..I would think n o matter how big your fuel supply, a certain amount is only flowin through this hole. Any thoughts.

 

If you're talking about the one at the back of the pump, its around .050" and its part of the return system and should not be fooled with. Its there to maintain a certain amount of fuel flow and keep the the case pressures of the pump within a certain range over the rpm range for the timing advance.

 

hmm..makes sense

 

You could swap a high flow banjo bolt in there to see what happens.

Somebody did that and was wondering why the truck ran so bad...