1989 F350 7.5 extra capacity fuel tank sending unit help needed
 

Okay,
We picked up a extra capacity 38 gallon tank and midified the existing fuel tank sending unit by increasing how far down the fuel pump sits but have had nothing but problems with buring out fuel pumps...I must be missing something. Does anyone have the instructions for modifying an existing ford rear tank sending unit. I really don't want to have to back to my stock rear tank.:-banghead