Okay. 1969 bone, stock, standard beetle would start up fine, run well, accelerate well, even up hills. After 10 or so miles, a sort of hesitation would creep in that felt like onset fuel starvation. Checked fuel filter, found rust. Replaced filter. Checked fuel, tank- found rust. Replaced fuel tank, cleaned brass filter where fuel line screws into tank.
What else is there to check? What throws me is that the beetle runs perfiectly for about the first ten miles or so and then gradually develops signs of fuel starvation. It never stops running and seems to idle fine. David