Carbs Rebuilt, Fuel Lines Added. Ready To Go?

wrote:

Are you 100% sure? Every tapered inline filter I have ever seen has the wide end as the outlet and narrow as the inlet and if they are in backwards it would cause the issues you are experiencing. 
Second pic is k&n and looks identical to yours. Both have flow direction arrows on them of thin to thick. 

 

 

Just going back through your posts you posted a picture of a gravity tap but I thought the 750b1 has cv carbs with an outlet for a vac tap line. So begs the question of why are you using two inline filters and two fuel lines?