Cost Savings?
So what’s going on here? Well, as with most things, the blame lies in the fact that the CP4 replaced the old reliable CP3 as a cost-saving measure. See, the newer model trucks have more efficient piezoelectric injectors, which means they require less fuel to run properly. Sounds good, right? The problem is that with less fuel volume comes less lubrication of the components in the pump. Adding to the trouble is the fact that the ultra low-sulfur diesel we have in the US has less lubricity than elsewhere in the world.