These are what I use:
https://www.surpluscenter.com/Engine...-28-1836-R.axd
I just build a wooden rack beside the engine, setting on the ground. Each tank is 4.5 gal and it comes with a shut off valve and below that is the fuel spout to attach a gas line to. I mount mine about 3-4" above the engine. I only use 1 on each pump but you could just as easily connect multiples as long as they were at the same height, just use tees to string as many as you want.
On my 6.5 HP Honda, running the vacuum at about 2/3 throttle I get about 14 hrs on a tank. I also watch the forecast and when collecting late afternoon I only add enough to run until it is supposed to freeze and I try to have the pump go about 2-2.5 hrs past that. I just do the math, I multiply the hours I want it to run times 3.1 hrs/gal and I try to guess that. I carry my gas in 2.5 gal cans, one in each hand. It's pretty easy to get quite close. If the forecast shows a freeze just before or within 3 hrs of sunrise I run it straight thru. I go to collect 2x a day. If you only want to go once a day, just tie 2 tanks together.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.