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Yeh. It's weird. One thing I have learned... I never park the rig on a steep hill with the fuel tanks downhill from the engine. Also, I turn the fuel tank selector valve only when the engine is running and let it idle for a few minutes, before driving. Do you think I am just doing superstitious...

Should've asked.... Do you happen to know the size of that O-ring?

Cool. So, I should disassemble the valve that switches the tanks? Thanks 98G

Hi Folks! This question concerns switching between fuel tanks on a 1988 Harsco M936A2 Wrecker. Sometimes, when I switch between the right and left fuel tank (lever under the driver's seat), the fuel system loses prime. I suspect that there is some idiosyncrasy about which I need to learn...