exploring TS torque
Join Date: Oct 2007
Whichever way you go, I wouldn't get too hung up on vertical-ness. I originally put mine right back near the tank and almost vertical but close to the exhaust / rear muffler. It worked well but I then got a cutting out problem in hot weather so I moved the pump to the "standard" location under the rear RH floor, and horizontal.
The cutting out problem tuned out to be a melted fuse holder and nothing to do with heat near the pump. However the subsequent horizontal-ness of the new installation causes no problem and it's well out of the heat, and easier to get to (not that I've needed to)