seems the line and rubber piece is 2 diff sizes if it takes 2 clamps to seal it,looks like 3/8 rubber on a 5/16 line,5/16 hose will be real tight on the 5/16 line and the finger type clamp you show will work fine for holding

I have had better luck with the filter down by the pump and not up there were you got it

it will get a lot of heat right there,IMO

not to mention, the fire hazzerd

small elect fuel pump in the back by the tank and a fuel regulater will take care of it

I run the elect pump into a HPG1 filter then up to a regulator and then to the inline eddie filter on the eddie duel feed metal line on the eddie carb,once I cut it back to a steady 3 lbs it stoped flooding,rough idle,poor hot starts,fouling plugs