I've come up with a way to modify my existing tank to work for EFI. Cost is less than $150, including the fuel pump. I wanted to detail the process for those who want to do this. I haven't finished, but here's what I have so far... This is the stock tank pickup and sending unit, which I am modifying and reusing. Notice the 1/4" line that goes through along with the 3/8". The 3/8" line is the factory pickup, I'll be using it as the return line. Now I'll be adding another 3/8" line where the 1/4" line is. Obviously the 1/4" needs to be removed. I did by simply rotating it back and forth until the solder broke free and pulled it out. Then I used a torch and heated the solder and blew it out with air. I needed to enlarge the hole to accept the 3/8" so I used a punch and gingerly tapped it into the hole until it was the right size. It worked well. I didn't use a drill bit because there's actually a nipple on the bottom of the sender cover that I wanted to retain so I could re-solder the new line in. I didn't get a pic of that process, but I'll put one together. The next thing I did was get the tank itself ready. I am using a Walbro In-Tank 225 lph fuel pump. The pump is mounted to the sending unit and it won't fit through the sending unit hole while attached to the sending unit. So it was necessary to cut an access panel in the top of the tank to mount it. I cleaned the tank out by flushing it with water for about ten minutes. Then I put about a half a quart of degreaser/cleaner, Purple Power I think, in it and shook it up and flushed it again. While it was still full of water, I made the cut in the top of the tank using a jigsaw. It cut beautifully and no boom! Once I got it open, I completely dried the inside of tank by hand. Still smelled of gas but no fumes. The next few pics show the pump installed to the sending unit actually in the tank. I cut off the bottom of the factory pickup so my return will enter the tank right at the bottom of the pump. I just used stainless clamps to hold it all together. And these two pics are showing how the lines will hook up inside the tank.