before you fill up ur tank or after?

 

not sure that it really matters but i think most the directions for fuel system cleaners say to do it after you fill up.

 

No, you do it before so that the filling of the tank allows the fuel system cleaner to be mixed thoroughly with the gasoline.

 

on the can it says Add one 11oz can bg 44k to fuel tank at fill-up...

 

oh okay, thanks just wasnt sure

 

i thought that most fuel system cleaners are heavier than gas and sink down to dilute anyways, hence the mention of it not mattering.

 

i thought most fuel cleaners were lighter then gas?
so if you pour the clenaer at the end of the fill up it would just stay on top?
dont nissan manuel state we shouldnt use any fuel additives?
but then on a redline bottle fuel cleaner, i read it is recommend by nissan?
someone lying here