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I think pumps and diaphragm springs were recently discussed, but I passed on that thread. Of course now I'm in the middle of rebuilding my original pump and have a spring diameter question. Thanks for going over it again! In reading the to-'65 factory manual it states in a "note:" on page K3-7 that T1 & T2 pumps will have a spring wire diameter of 1.5mm while the T3 will have 1.6mm. Further more it states that the 1/5 will be "silver" and the 1.6 will be "brass". It states " In disassembling the pump and removing the original diaphram there is a difference between it and the old stock Effbe rebuild kit spring / diaphram (MPE-80V2 if that means anything). The old original one (diaphram spring) from the original German pump is a "brass" color and the wire diameter is at least 1.6mm more like 1.7mm. The replacement spring wire diameter is about 1.5mm but more like 1.45mm. The replacement parts are good "German" NOS parts, but I'm not sure they are T3 only. The question is, will this affect the delevery of fuel to the two carbs significantly(its for a twin carb '66)? Will it affect driving performance? Steve ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/