Re: Robin - Subaru EHO35 - No Fuel Tank Ideas
Roadkill, in a multi-engine setup the smaller tanks are sufficient because they will continuously be filled by the auxiliary tank.
In my twin-engine setup there is a t-fitting and a primer bulb below the tank's petcock. The primer is necessary to purge the air and push gas into the tanks.
Others have mentioned that if if you plug the vents on both engines' gas caps, fuel should flow on demand from the central tank.
If you intend to assemble these on a business level, try to find a distributor that'll give you a better deal on engine prices.