Quote:
Originally Posted by MakoMike
From the way he described it that is exactly what would happen is he removed the fuel cap when the boat was jacked up as he described. Your description of why the fuel weeps is absolutely correct, but what you didn't say is that when the air pocket is cool the VACUUM behind the fuel is what is holding the fuel in the tank. If he breaks that vacuum and allows atmospheric pressure into the tank the fuel is going to come shooting out until the fuel level is below the vent.
Try this little experiment. Take a can of liquid (beer soda juice or water) and poke a little hole in the side. The liquid will run out but only slowly. Now do the same thing but open the top, the liquid will shoot out of the hole. Same thing applies to his fuel tank, no atmospheric pressure on the top and it only leaks slowly. Add atmospheric pressure and the fuel is going to run out much much quicker.
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Vacuum holds the fuel in???
If that was the case the motor would not run, It'd be fuel starved, like when the vent is clogged. Try this experiment - seal your vents and take your boat for a ride.
You're beer can example is also flawed because the hole in the side is below the liquid level, so of course it runs out due to gravity. The "atmosphere" end of the vent hoses are above the fuel level, so fuel stays in the tank thanks to gravity.
If you still don't get it I have to give up.