I can top that story. sort of. "In a previous life" I sold auto/ truck parts for about 17 years. One day a guy came in and asked about a dual tank valve. Back then seemed like EVERYBODY was buying or building aux tanks for their pickups. I showed him electric and manual valves, and outlined what he'd need.
He asked me "why can't you just tee them together" and I told him why.
He thanked me and left. Sometime later, maybe a couple of weeks, he came in. I was busy. He waited and talked to me, and wanted most of the items we'd talked about. As he was ready to leave, he told me,
"You know, last time I was here, I went down the street and bought some tubing and a tee, and thought I was pretty smart. Hooked all that together, and went and filled them up. Went home and parked in the garage. A bit later I went from the house to the garage, and there was fuel all over the floor. The thing is, we have a NATURAL GAS WATER HEATER in the garage, and I have no idea why it didn't blow up
What happened? One tank filler was a bit higher than the other. The fuel drained from the high side to the low, and right out the vent of the low tank.
