On the 126 you have to pull the back seat. Then use a 46mm socket to remove the unit. I bought the socket from northern tools along with a 3/4'' to 1/2'' reducer for about $18 bucks total.
Those are some good pictures of what you will be getting into.
One more thing--- get a coffee can or something like that to put the unit into as soon as you pull it out of the tank, it will catch the fuel that
will be running out of the unit.
__________________
If it ain't broke take it apart and find out why.
1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King
Ride in Peace Eric Peterson, Harley of Macon