I had a plate on the floor inside which covered a hole in the floor used to access the top of the fuel tank. If I recall, there was plenty of room to put my arm through the hole and plenty of space between the tank and the underside of the floor.
The fuel door for filling is right there too giving even more access to the tight little spaces.
Heath, Laura and The Kids
Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison