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I’m still trying to figure this out. Maybe someone here knows how the fuel lines are connected in 2008 wx1880. It looks like the kicker line goes direct to one of the tanks. Is it the front or back fuel tank? The main motor is connected to both tanks with a switch to choose front, rear or dual fuel tanks. Is it possible for the kicker to create negative pressure in one or both of the tanks and suck the fuel out of the main motor? Any suggestions would be appreciated.
You are correct on the fuel line routing. The main motor line go to both tanks with a switch in it. The kicker motor has a seperate line running to the REAR tank ONLY.
Does this happen mostly when its warm out? My best guess would be that the big motor is vapor locking. It would be very hard and a lot of things would have to happen perfectly in order for the main motor fuel to drain back.
Next time it happens see if when you pump the primer buld a couple of time if it starts right away.