V21 Fuel Tank Removal - questions

[Blue_Runner]

Back story - I have an occasional fuel restriction that sucks my primer ball flat. This happens intermittently maybe 1 - 2 times per year. The restriction is between the h2o separator and the fuel pickup inside the tank. I believe there is some debris inside the tank...possibly a plastic grocery bag (joking).

When and if it happens I can disconnect the fuel line from the h2o separator and blow the obstruction back into the tank, then all good.

So far I have:
1) removed, inspected pickup tube
2) pumped the tank last year - no smoking gun found
3) replaced all fuel lines tank to h2o and h2o sep to motor

Last trip out (this past Saturday) it happened in less than fair seas. I had trouble removing the (new) fuel line from the hose barb on the h2o sep. She was on there! Finally got it removed but I can't be dealing with this anymore b/c it just is not safe!!!!!

So unless you guys have other ideas I'm ready to cut the floor as the V21 does not have a removable hatch cover. Here again I break out Destroyers pics which have been invaluable to me (thanks again to D!!).

Notice on the middle round inspection hatch, while wellcraft did not make a removable hatch, they did make an indentation in the deck skin that is like a "cut here" pattern to access the fuel tank. So I'm guessing that is where I need to cut. My questions are what to cut it with and more importantly how to put it back! (top and bottom pix are inverted left to right)