So, I've finally decided it's time to upgrade the fuel system on the ol' A, I'm still using the original tank in the cowl. Most fuel tank installations I've seen on trucks just put a simple cylindrical tank in the bed of the truck and let it gravity feed to a mechanical fuel pump on the engine. That would be the easiest thing to do, but I don't want to give up the bed space, cause I actually use this thing to haul stuff around. Not much, usually just some music gear (guitar amps, PA speakers, etc), but sometimes I use it to bring home bags of salt for the water softener, or bags of quikcrete for yard projects, or Christmas trees at Christmas time, whatever. I do use it. So no tank in the bed. But I have room under the bed behind the rear axle. And after measuring it and searching all through the net I've come down to 3 basic options. Take that same cylindrical tank and hang it under the bed, or go with a commercially available aluminum tank I found online (the only 1 that is close to what I need), or build a tank to fit. I've done a lot of reading articles and forum threads from guys who have built tanks, and it's not beyond my skill level to do. I've got a friend at my Church that has a sheet metal fabrication business, and I already spoke to him, and he will cut and bend the metal for me. So here are the 3 options (no, the drawing is not to scale, and not intended to be a perfect drawing, I just drew up quickly in Microsoft Draw last night to illustrate my ideas): Pro's and con's: Option 1, Pro - Tank is inexpensive, available, easy to install. 11 gal capacity. Con - Hangs real low, outlet at the bottom is exposed. Long way from bottom of tank back up to frame rail, I'm not sure an electric pump will pull the fuel up that far. Option 2, Pro - Tank is a little more expensive, but not bad (~$200), it is available for shipment, easy installation. 12 gal capacity. Con - Tank hangs real low in back, no chance to tuck it up between rails, so 9" below rails. Outlet is on the top of the tank, electric fuel pump will have to pull fuel up to 9" when the tank is low on fuel. Optoin 3, Pro - Best fit, will tuck up mostly out of the way and out of view from the rear. Possibly no electric pump will be needed? I'm not sure if the mechanical pump on the engine (SBC) will pull the fuel all the way. But if elect pump is needed, I could install it right down at the outlet level of the tank, so no pulling needed. Cost of materials is low (but will require assembly). 10.3 gal capacity. Con - Have to build the tank. Friend's shop is busy, backed up with work, will have to wait till his work load opens up, maybe not till Winter time.