I think you're right. I think the aftermarket ones are all seeming to be shorter or different. I am going to take the original one out of the other tank that was a little longer and put it in. And see if it functions better way its supposed to be. I originally bought a new 1 just to have a nice sending unit the other one had a crack on the filler tube. But I did JB weld it and sealed it I think I will give it a try.