mechanical pump
2012-2-1 · piper106. As far as I know the earlier VW 1.6L NA and Turbo injection pumps used a 17 mm drive shaft, and a 9.5 mm plunger. Bosch pumps on the VW TDI, and the Cummins 4BT both had 20 mm drive shafts, the TDI pump having either a 10 mm plunger (manual trans cars) or 11 mm (auto trans), both being electronic control, the Cummins 4BT having a 12 ...
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