Can I install a new fuel sender unit on a 72 duster without removing the tank?
If the gas guage is off there is a chance someone replaced the OEM with a "new" one
New ones have two problems
First off, they are linear, while the OEMs are not
So an aftermarket sending unit will NEVER read right on its own
Secondly, the new ones also come with a new locking ring, which is somewhere in the neighborhood of half the OEM thickness, and therefor, prone to leak
So, if tomorrow, you get under there and the locking ring is nice and shiny, you may very well have found the issue
As for removing it with the tank in place..piece of cake
Expect the first one to take about 30 minutes
After doing it a few times, you can R&R one in about 15
My rule of thumb is no more then half a tank and it won't spill
(Because the sending unit sits in the side of the tank, and not on top, it will gush out if you do this on a full tank)