^ Yup, that's why we threw that thing away (installing a block-off plate) and installed electric fuel pumps at each of the tanks, then installed an air hose one-into-three splitter, installed backwards, then a fuel pressure adjuster just after that, then one fuel line to the carb.
We only had one fuel tank, 36 (!) gallons. The Winnie we took the other two tanks from had a tank selector switch, but it was broken, so the electric fuel pumps and 2 toggle switches on the dash were the easiest and cheapest way to be able to switch between tanks while driving. Plus it adds security, because we turn off the pumps when we park and run it out of fuel to the engine on purpose, then leave the switches off. To start it, we turn on whichever pump we're going to use, pump the pedal 3 times and turn the key. Vroom.
As for the carb, our '73 440 has a ThermoQuad. My husband rebuilt it as far as he could, but the adjustment screws were broken off when we got it. So we bought a used one, same model number, and had his brother run it through the ultrasonic cleaner. Now it's time to take it apart and put the rebuild kit in, but we already have that on hand (make sure you get a rebuild kit that doesn't say NOS - new old stock means parts that aren't ethanol-compatible).
As long as he keeps his foot out of it, we get 8-9 mpg when we're fully loaded with gas (36 + 36 + 27 gals) water (30 gals), propane (oh, heck - a large horizontal cylinder), 3 people and food, plus towing a trailer with 2 raceboats and motors and tools.
