3408 Fuel Injection Pump — 7W-1983, 4W-7058, 4W-6037, 7W-0561 for CAT 3408B & D9RFour catalogue figures sit under one engine name, and they are not four versions of one article: they are one pump, two sub-assemblies and an individual plunger pair. The gap between them reaches forty times in price, which is why the level has to be agreed before the number is written on an order.Key FeaturesFour levels separated, from single element to complete pumpEight and twelve cylinder