Finally getting around to updating this post in case anyone finds useful.
Installed the new fuel cap/filler before putting the boat in this year, but kept forgetting to take some pics. Took a couple this evening after a great long weekend of early Summer(ish) weather here in Seattle (i.e. water temps up to a balmy 61).
Install was straightforward - removed 6 screws that held the original threaded filler neck and then cut the original rubber fuel filler hose. I couldn't coax the original filler neck free after loosening the hose clamps so just cut the hose after eyeballing the new filler neck, reducer and hose.
Had bought the 2" to 1.5" stainless reducer and 6" of 1.5" hose from Filler Neck Supply (
www.fillernecksupply.com) over in Eastern Washington (Spokane). SKU 3851 for the reducer and D150L6 for the 6" of 1.5" fuel rated hose. The reducer and hose fit great and I ended up cutting off about 5" of the original 2" rubber fuel filler hose to make room for the new neck, reducer and hose.
Simply removed the port speaker for access to do this swap.
Had to use a Dremel to enlarge the fuel filler hole in the hull slightly -- probably no more than 1/8" for the new fuel filler neck/cap to fit flush. The original gasket from the fuel neck was in good shape so I ended up trimming the inside of it with some shop scissors to fit the larger opening. The new filler had four holes for mounting, so drilled new holes and secured with self-tapping stainless screws.
All in all, this was an easy mod and I'm happy with the results. I was originally going to plumb the vent line into the one integrated into the new filler, but due to time decided not to and simply plugged of the vent connection on the new filler and left the original vent intact.
Time will tell how well this works out...at least I won't have to worry about adding another chain to slosh about in the fuel tank...