Reply to "Volume of fueltank."

On our early, thoroughly modified sender, the plastic lug holders are positioned slightly off- longitudinal, with the frontmost holder pointing a little outboard of straight-ahead.
10 years ago, I modified the early sender to have a 3/8"ID fuel out-tube like the late senders have, thinkimng I was gonna mount EFI (which didn't happen). I recently added an in-tank electric fuel pump on the sender, so the top of our sender looks way-different than stock. But everything still fits and the float registers correct fuel level.
What often happens is, someone tries to withdraw the sender from the tank without first removing the tank or the left rear quarter window, and the long flexy float arm gets twisted during removal. Then on reinstallation the float hits the in-tank baffles and wrong gauge readings result.