The point is, these stoppers are sold for use in turbine aircraft, as long as you use the black one. I don't imagine I'm the only one that bought this stopper for a jet. Maybe I was. There is however a chance I got the only bad one in the lot. To further clarify, the first thing I did upon teardown was make sure the stopper came from a BVM kit, and was not a DuBro. The differences are obviuos. Larger holes and only two of them compared to the smaller three holes in the Dubro. I don't own Sullivan tanks, and my Great Planes tanks have small stoppers.

I was going to keep this to myself until I realized my buddies and other RCU readers might appreciate the notice and want to spot check their jets if they are using the BVM or any other Kero/Jet-A compatible supplied black stopper. If their stoppers are good, great. No worries.

For now my jet is grounded waiting on the engine and my own personal testing. I will test the brown ones. You know what they say, fool me once, shame on them, fool me twice, shame on me.
I and some fellows at work, are checking the fuel. So far there is no evidence it is not K-1 or contaminated, but we are still checking. The oil was purchased at the Bowling Green KY airport . For 13 bucks, and the feel and smell, it is clean 2380. All my co-workers agree.

As for the engine, I am refraining from any conclusions until the factory has a chance to look at it and tell me what went wrong. The stopper could have been a coincidence. I will call BVM when I have more info. One of the two stoppers I have is fine so far. So this is not an issue with all black stoppers. My guess is this is an isolated case. Rubber does rot on occasion, and break down with exposure to almost any fuel.

I'm a lucky dude, I still have the jet. (Thanks Scott)