GordonThree wrote:
agesilaus wrote:
So the vacuum on the generator fuel tank would power this pump?
Vacuum from the engine. You drill a small hole into the air filter box and cram a rubber hose in it. That gives you a little puff of vacuum every revolution. This spins the impeller in the pump and moves a little fuel.
For generators with a separate fuel shut-off (like Yamaha), you can leave the fuel tank empty and shut off, and attach the external tank after the shut-off with one of those marine style quick connects.
I think Champion have a shut-off too?
There's video on YouTube that explains it better than I can.
Not an impeller really, it's a diaphram. One side is the crankcase pulse pressure the other is fuel and the movement of the fuel is controlled with a reed valve. Everytime the engine cycles, the pressure differential pulses the diaphram and fuel moves on the wet side of the pump. Stone simple really.
Only two drawbacks but neither apply to a small engine. One, the volume is low and 2 the pressure is also low which is why they won't work with fuel injected engines (like in your car or truck) but work fine on a small engine with a carb.
I'm sure some engineer somewhere made a pile of the idea.
