RE: Jett Boubbless tank
The whole purpose of using a bubbless is to have no air in the fuel so it can't foam. If you use an electric pump, it is very difficult to get all of the air out of the tank. Having a little fuel in before you attempt to suck the air out is of no use. It is not until all of the fuel is removed that you start removing the rest of the air. The tube inside the tank is in the center of the bag, not on the bottom as with a clunk. You don't have to have to have used all the fuel before air can get to the tube. Any air in the bag will cause an opportunity for foam. Seems silly to buy a bubbless tank and then not fill it properly. Also, using pressure on the pressure line to force the air out of the bag is taking a chance on loosing the seal where the pressure line enters the tank. It is not designed to withstand more pressure than the exhaust normally puts out.
If you are going to use a Bubble-Jett Tank, buy the Bubble-Jett tanker so you can fill it properly. Any other method is taking a chance on leaning out at the end of your run. Isn't that why you bought a Bubble-Jett tank? I hear that the three line Tetra will work well with an electric pump. If you don't want to use the tanker, you should probably think about a three line Tetra.
Blessings, Terry