The pump is in the tank on your XT660, I think you need a filter capable of handling fuel under pressure not one of these gravity feed units.

Consider this, one is designed to have fuel pushed through it, the other pulled through it.

All your doing is trying to save the injectors so why not run injector cleaner at regular intervals to remove the gum deposits? I am a big fan of running 1/2 mix Shellite every 5 - 10 tanks it cleans petrochemical deposits.