sending unit adjustment in new tank???

[tracterman2]

okay, just bought a new fuel tank and sending unit from LMC...got it all installed...put ten gallons of fuel in there and it only goes up to 1/8 to a 1/4 of a tank...I know these tanks aren't that big...so whats the deal?? do you have to set the float?? I know my gauge works well because while I had it out I hooked it up and played with the sending unit and it worked flawlessly...I just think it is to high...what do you guys think?? Has anyone run into this before??...I know I order the right unit...It just puzzles me...maybe I need to bend the float slightly down to get it to register better....I just don't know. Thanks