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Gas from left to right

I had one of those "funny" experiences today when out in my longchamp. I have been battling a battery and regulator issue, and thought I would venture to the gas station to get some gas. Here in the states, you can not fill both tanks at the same time, so I tend to do one and then the other when I need more gas. I filled the left tank, and yes I am sure it was the left. Drove around and suddenly the right tank had more gas in it. The left was down about a quarter and the right was up a quarter.
I thought I was going nuts. So, I thought I would pull out the parts book and see if there was any way for the gas to run from one to the other. I could not really see a way. Someone told me once that there were check valves connected to the hoses, but not really in the drawings. So, I thought I will try a test. I switched to the left pump. I did not start the car, and I could here the pump pumping away. 5 min later, still going. When I change to the right, it pumps until there is pressure, then it stops. Ah, there must be a check valve! SO test number two, I removed the vent at the tank, placed a plastic bag over the vent, and Low and behold, pressure. SO, I must have a stuck valve in the pump or somewhere along the line.

So, has anyone ever heard of this? I was thinking about installing another check valve at the T where the two pumps meet, but not sure there is something on the market.

We
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