primer bulbs - when i first started rebuilding my bird shannon told me to stay away from primer bulbs. i thought "i need to prime my JPXs, its the only way!" so i installed primer bulbs.
daffy installed primer bulbs thinking the same thing.
after replacing them three times with 3 different kinds, having them all leak fuel and cause air bubbles, we threw them all out and came up with novel ways of priming the engines that did not involve primer bulbs.
daffy uses an electric fuel pump, and i use the "pump air into the tank vent" idea to push the fuel up to the engines. well, the methods are not novel i guess
stay away from primer bulbs.
and invest in some nice hose clamps, as you play with the fuel system you'll be making lots of changes and re-lock-wiring every connection gets tedious.
do your two tanks cross feed, or does each tank feed an engine?