Join Date: Aug 2018
Location: Lowell area, MA
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(Edit- sorry, tabora and I were replying at the same time)
Mine (Honda) has a fuel pump, so it will create *some* vacuum, to help pull from the external tank.
But I've read that you can use an external tank with a Yamaha, which is also gravity fed. As I recall, you need an airtight seal in the generator's tank, but it can be done. If your marine tank is like mine, the purge bulb on the gas line may allow you to draw/pump gas out of the external tank, despite the line coming out the top of the tank.
I don't remember if those people used a fuel outlet from the bottom of their external tanks. I would be somewhat leery of trying to do that, myself, without being certain that the materials in the bulkhead fittings are gas-safe.
You probably need to start with the gen's tank almost full (I've had better luck starting that way, even with a fuel pump), and have the external tank positioned above the generator. I'm assuming you're thinking about modifying the cap to accept the external tank's line. Based on that, I'd loosen the generator's cap use the purge bulb to fill the fuel line, and get it flowing into the generator's tank (maybe almost overflowing the tank?), then quickly tighten the generator's cap.
Do you have a fuel line between your tank and the carb? If so, perhaps you could just buy a different, larger gas tank (universal, etc, or any tank like from a broken lawn tractor), then mount it above the generator, plumbed to the carb? Maybe with a 3-way valve to allow switching between the external and internal tanks.
Last edited by RedOctobyr; 09-03-2019 at 10:25 PM.