GM used the pump on its 6.6-liter LGH and LML Duramax diesel engines through 2016, opting to use the Denso HP4 pump on the L5P Duramax, one of the best Duramax engine versions, starting in 2017.

Diesel engines operate at higher compression ratios than gasoline engines, and fuel is injected under much higher pressure. An injection pump, usually driven by a belt or chain linked to the ...