humptybump
Well Known Member
A number of pilots either suggest running a tank empty "for the experience" or even as a general practice. I've never done it until today. It seemed a perfect opportunity. I was at the end of a long cross country and in familiar territory and up high and "the other tank" had about 12 gallons. So I kept a close eye on the float sensor round fuel gauge. When it hit the pin, I noted the fuel flow meter's "used" number. Then a flew and waited. After another full gallon was reported, the fuel flow meter flow rate started goin up quickly to 35-55gph this was my 10 second warning because after than, it started to get quiet as I switched tanks and picked back up after about 3 seconds.
I don't plan to make a habit of running a tank empty but this test now provides a lot of useful information.
I know know there is about a gallon in the tank when the needle hits the pin.
The fuel flow meter gives me a very convincing indication that is is getting air, not fuel.
I know what to expect if one tank stops feeding the engine and I switch tanks.
I also get to find out exactly how much useable fuel there is in one of the tanks (thus far, I've just trusted the builder's documentation).
I don't plan to make a habit of running a tank empty but this test now provides a lot of useful information.
I know know there is about a gallon in the tank when the needle hits the pin.
The fuel flow meter gives me a very convincing indication that is is getting air, not fuel.
I know what to expect if one tank stops feeding the engine and I switch tanks.
I also get to find out exactly how much useable fuel there is in one of the tanks (thus far, I've just trusted the builder's documentation).