RE: Alternative to a bladder tank?
The first Tettra tank I used had three lines. I used my electric fuel pump to fill it. I could cycle the pump and get all the air out, once full I didn't want to just run the pump, in case it put too much pressure on the bladder. Other racers won't notice you are using one, since you won't fill it with a syringe. The system worked fine, I filled it several times on the bench to make sure it worked before putting it in the plane.