Check the fuel check valves that are pressed into the flange on your primer pump. They have a tendancy to losen up, if one or the other flips it...
If you have an "Applied Brake Pressure" gauge in the dash (and you should,) follow its airline. It should go into an aluminum block - a manifold -...
CAT motors also have a unique potential problem, unrelated to the fuel tank levels but it will drive you insane trying to figure out if you don't...
There is a small fuel line connected to the top of each tank. These smaller lines come from the back of the head on your engine, returning...
You left out some folks who also deserve recognition! The idiot who "randomly selects" just you every month to donate urine at a collection point...