Ok, I have been working on the gas tanks. I really want to keep my stock poly 14.4 gallon rear tank. I personally don't like how far down all the aftermarket tanks go. I can't get over the look of it. Plus 14.4 gallons is enough, it's about what my tundra has. I tried a few different paints on the tanks, first I tried bumper paint, then standard auto stuff then finally I gave my engine paint a try. The engine paint was by far the strongest and it doesn't scratch or scrap off easily and is resistant to gas. It smells nasty when curing, which makes me think it's actually going to hold. I used Dupli-Color Engine Enamel with ceramic.
The poly rear tank had a crack in the tank vent area, I used this technique (
https://www.youtube.com/watch?v=EbtUxJJs8G0 ) and welded the seam and then used gas tank repair caulk to smooth out the welds and make everything look great.
I will be running the aux tank as a reserve. I will put a transfer pump inline to re-fill the rear tank. Which should net me around 23 gallons. I plan on using the stock dash gas level switch to a relay, that way when I switch to aux it will start pumping gas from the aux to the main tank, I can slowly watch it empty to the main while still driving.
I plan on using the tanks vent with a new fitting for the efi gas return, then use a vented gas caps for both tanks. Is there any reason this won't work?
I got Tom's Bronco's new stainless fuel tank sending units, then I will be using bronco graveyards new 77 stainless gas tank nut. Mine was broke. Along with new straps and new bolts.