I had a 100 gal tank in the back of my 98 chevy pumped out of the top of the tank into a t in the filler neck connected the vents together so gas fumes did not escape into the air only thing I could see wrong with this setup was my evap system was on...
I pulled a 13000 lb kz sportmen toy hauler with a 98 2500 chevy 350 with 410 rearend ran around 3000 to 3500 rpm every where it surprisengly towed preety well did that for 6 years even took it it to jacksonville florida from st.louis ran around 5000 ...