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On 15 Mar 2001, at 19:47, Geoff wrote: > At 14:26 01/03/15 -0600, Jim Adney wrote: > >Besides, warm fuel will vaporize more readily. > > That's precisely the problem, as my understanding goes. Vapour is > difficult to pump. Underhood temperatures get fairly high, and the > pressure change that happens in a fuel pump may be enough to vapourize > it, and cause a fuel starvation problem. That would be vapor lock, but it simply won't happen if the tank or the pump is properly placed. It only happens when the pump is required to suck fuel uphill to the engine. Under these conditions the pressure in the gas at the pump inlet will be below atmospheric and there is a chance that the fuel will boil there. Modern cars and any race engine worth its salt will use an electric pump in or under the gas tank. With this arrangement, vapor lock won't occur. FI type 3s are this way, and this is just another way that they were >10 years ahead of their time. ;-) - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/