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On 3 May 2001, at 23:41, Leon Martinez B. wrote: > I don't beleive that Bosch assumes > that gasoline is the same all over the world This brings up a good point: that today's gas is not the same as when our cars were new. But I think adjustments are better made with the fuel pressure, where the change is proportional, measurable, and reproducable. The Pressure Sensors have a tapered shaft that serves as a transformer core. This shaft moves back and forth in the transformer yoke as the bellows changes length. The taper is not just a simple taper, and the magnetic effects are also non-linear. The result of adjusting it is so complicated that I just don't think it is possible for one of us to actually have much of an idea of what the consequences are over the whole range of operation. In my field we call this "wandering around in a multi-dimensional parameter space." It's a bit of a joke and a metaphor for being lost and not knowing which way to turn to get home. OTOH, cranking the fuel pressure up by 10% will give us 10% more gas under all conditions, which MIGHT be just what we need to offset the fact that part of our gas is now alcohol (and other things.) > The original pressure sensor in 1968 with part > number ending in 001 (still available but with > epoxy glue on the screw)had no seal because > emission standards were not enforced and > requirements were very loose. I have one > of these original ones. I bought a new 68 squareback in March of 68. It came with a 001 pressure sensor that was epoxy sealed from the factory. They ALL were, but there was a rather simple trick to removing the epoxy and my dealer eventually did so. I'm not convinced that was a good idea, but it still ran fine. I agree that there was no harm in adjusting this already "devirginized" PS. You may well have improved it. I really do prefer to play with the fuel pressure, however, because I know exactly what its effect will be and I (and the next mechanic) can always set it back exactly where it was. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org