i have a 96 f150 single cab long box i put a flowmaster 40 series with dual outlet and i was lookin under my truck n im wondering if its bad to run the pipe under the tank because my front tank pump is out...i was thinking fixing the front pump and take out rear tank so something like that any thoughts????

 

Thats the problem with duals , the front tank is in the way , so if you remove a tank , remove the front tank and keep the rear tank ....Then duals are no problem...Lew