Where is the fuel going?

8434 · Post by **8434** » Mon Apr 10, 2023 10:52 am

Hi all,

I have a 1947 C140 with a "BOTH" fuel tanks option and a cross over line. I have the original fuel caps with the vent holes in the top. I noticed over the winter that I was using more fuel than I expected, I also notice some streaking down the wing behind the fuel caps.

I suspect that the gasket inside the fuel caps is the culprit and have ordered replacements. I'm still a little suspicious as I would expect fuel siphoning to occur at full tanks however its happening at half tanks as well.

Has anyone experienced siphoning? Was it the gasket or something else?

I've done a thorough inspection of the lines through the cockpit and the gascolator and haven't found any leaks.

Thanks
Marshall

6298 · Post by **6298** » Mon Apr 10, 2023 4:34 pm

Years ago I left a cap removed, hanging on a chain. About 100 miles into the flight I noticed my level was very low. Landed, fueled up and put it back on. The rest of the flight was normal fuel usage.

8434 · Post by **8434** » Mon Apr 10, 2023 4:43 pm

Haha, I've seen that on a 172 when I worked the ramp.

Post by **6643** » Mon Apr 10, 2023 6:48 pm

Change the gaskets on the caps before you spend a lot of time worrying.

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Where is the fuel going?

Where is the fuel going?

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Re: Where is the fuel going?

Re: Where is the fuel going?