Flying gas caps and no fuel flow

We lost a gas cap on the 601 I use for training.  Don't ask.  

It is one of the new flush type with little handle that locks it down. 

No problem, both zenair and AS carry new ones and in a few days we had one.  

Installed and for the next couple of flights that tank would not feed. 

I did a flow check, all good. 

Turns out the new cap was not adjusted so it made a tight seal and

the amount of "suction" off the top of the wing was enough to overcome the vent and not allow fuel to gravity flow to the header. 

Adjusting the tension on the cap so the o ring contacted the flange 

properly fixed the problem. 

I'm never to old to learn another new trick. 

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Permalink Reply by Bob Simmons on July 9, 2024 at 12:11am

Are you sure we can't ask? Kinda takes the fun out of things.

Permalink Reply by Gary Welch on July 9, 2024 at 12:19am

They seem to have a way of coming out of adjustment over time as well.

I use silicone spray on them occasionally and check the tension. Always inspect fit and o ring at condition inspection. Or of those small things that can cause big problems if not operating properly.

Permalink Reply by Bob Simmons on July 9, 2024 at 6:56am

I was just teasing you, man.

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