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Old November 19th, 2009, 00:53   #6
L473ncy's Avatar
Join Date: Oct 2004
Location: 11-30-24-1W5
Just don't keep using the dump button.

A few times won't hurt it just it's not recommended. Just like going past or very close to the redline. Sure you *could* do it but it's not recommended because it puts strain on the engine and you risk overheating and blowing it.

Something you can do is press it lightly and let a little bit of gas escape and then letting go and letting it sit (so the o-rings can unfreeze) and repeating until all the gas is out. Now I'm not sure if this will exactly preserve the o-ring however it makes sense that if you meter it out and do it slowly it shouldn't be as bad.

In aviation actually, the crappy sewage water/avgas/oil stuff is actually collected and metered out slowly so that it doesn't adversely affect the environment so I don't see why metering out your gas slowly using the dump valve should hurt it.
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