So here is my idea and I am putting it to the test as I write this. Back in the days, I bought 3 small Honda generators and installed them on my trucks (semi trucks) for the purpose of creating an auxiliary power unit. These generators had an aftermarket cap with a fuel line built into it. When connected to an auxiliary fuel tank (which I fitted all 3 with), it would siphon fuel into the generator just because the declining fuel level in the generators would create vacuum which would pull fuel even if that external tank would be positioned lower than the generator (which was the case in all 3 generators).
I though I could apply this principal here as well. When researching it, I read those Honda generators had a built in fuel pump and that what actually pulled the fuel into the tank (and not the ventury effect the carburetor provide). The Suzuki fuel is probably gravity fed but I decided to try it anyway. BTW, my diesel mechanic killed my idea and told me the motor would starve. I thought if that would be the case, I can fit a manual or electric fuel pump and replenish the 1 litter the Suzuki hold every so often. I am using clear tubing so I can see the fuel level.
The principal is very simple; * I am running a line from the auxiliary tank to the cap through a quick sprayless connector I found on Amazon (when disconnected, both ends are sealed).
https://www.amazon.com/gp/product/B007G ... UTF8&psc=1This tube goes through the cap and reach deep into the bottom of the Suzuki tank.
* Another tube is coming out of the cap. on the inside of the cap, it is flush with the surface. on the outside, it is connected to a shut off valve on one side, and via an adapter, to a larger diameter clear tube.
BTW, it is running for 30 minutes now with the auxiliary tank positioned lower than the motor. My hopes are getting high...
Operation:* Before starting, and upon connecting all the lines, open shut off valve and suck out of the wider tube. This will pull fuel from secondary tank and fill up the Suzuki tank. When fuel will come out the cap. Push air back into the tube, drop the fuel level below shut off valve and immediately close valve. This insure the Suzuki tank is completely full and fuel system is primed.
* When done and want to put motor away, open shut off valve, blow air through the hose, and push all the fuel back into the secondary tank. This would leave very little fuel in the outboard which means no need to condition the remaining fuel if stored for long time.
BTW, the motor is working for over an hour and a half now. I am shutting down. The fuel line is fully primed. Did I mentioned the secondary tank is a foot lower than the motor this whole time? I think it is safe to call it a success