[davepl]

Originally Posted by VetteVet

Do not ever apply a full 12 volts to the sending unit wire. At the very least you will damage the variable resistor on the sender, and at worst it may ignite the fuel vapors in the gas tank and cause an explosion and fire, and burn down the truck and possibly cause injury or death.

Thanks! I'll take that as a "Yes" to my original post and confirmation that the scenario I'm describing (12V injected to sender wire) is a "bad" thing to do. You described it exactly as I envisioned it, complete with low fuel levels being the most dangerous time to make the mistake.

But I thought it was "intrinsically safe"