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> Subject: [T3] Fuel pumps for carbs > > > > > "The diaphragm spring installed in the fuel pump of the Type3 > to give the > higher output required is covered with a brass coloured > coating with effect > from November 1962. The previous springs on the Type 3 > differed only in wire > thickness from those on Types 1 and 2". > > It goes on to say that the Type 3 spring is 1.6mm wire, p/n > 311 127 147, > while the Types 1 & 2 are 1.5mm wire, p/n 113 127 147. The > fuel pressure for > the Type 3 is 4.2psi. It doesn't mention different parts for > single and twin > carbs, so maybe the extra pressure is just because of the > different height > of the tank compared to the other types. > This sound right. This would be the spring for the pressure regulating diaphram in the top of the fuel pump. Here at work, we use springs with different diameter wire to make different pressure regulators with all the rest of the internal components being the same. A .110" dia. wire gives us a 40 psi regulator, a .115" dia. wire gives us a 49 psi regulator, and a .120" dia. wire gives us a 58 psi regulator. Russ Wolfe russ_wolfe@MAHLEParr.com Mahle Parr Filter Systems 505 E. Madison Winterset, IA 50273 ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/