It depends on the fuel pump. If I remember right, the stock fuel pressure for a 194/230/250 is about 5 psi. You can get aftermarket mechanical fuel pumps for those engines that will put out more then 5 psi. You can also get a variety of electric pumps that put out anywhere from 3 psi to just about any pressure you want (using a regulator). Personally, I prefer electric pumps, but to each his own.
