This will probably sound dumb, but...............

[Gulf]

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by DRTYFN:If you run a vehicle's gas tank dry you run the risk of sucking sediment......... <HR></BLOCKQUOTE>

Ah........now I always disagree with that theory.

The fuel is picked up (in most vehicles) by a tube that goes from the top of the tank to a little above the bottom. Some vehicles have the fuel pump submerged in the tank, but it still draws from above the bottom. Any crud and water swills around on the bottom of the tank, and the fuel is drawn from a little above the bottom to avoid sucking the crud up. All that happens when the fuel is run too low, is that air will now be sucked into the pickup instead of fuel. To suck up anything else would require the pickup to imitate an elephants trunk and search for more fuel at a lower level.

One of our other vehicles is an F150 with twin tanks. We always run each tank empty before switching over. No fuel problems so far, knock on wood, in 170K miles. Actually, that's the reason I asked the original question.

I've come across some diesels that are self priming, and some that definitely aren't!
Don't want to make a mistake with this one!