I had similar issues with mine. The key clue to me was the amount of rust that would come out of the fuel filter when I changed it. A new tank and 3 hours of my time fixed it. When I looked at the old tank, the outside was clean and rust free, but the inside was rusty along all of the edges where the internal reinforcements were. All of that crud would work loose and clog the fuel filter.

On Aug 10, 2011, at 5:30 AM, T Collins wrote:

> There was accumulated crud in the gas tank blocking the delivery of fuel to
> the pump starving it. These happened slowly at first the hesitation at
> highway speeds, and then later magnified by the van sitting while I tackled
> the exhaust.