PART THREE: FASS TITANIUM 165GPH FUEL LIFT PUMP
The Duramax engine has used a Bosch CP3 injection pump since its introduction in 2001 with incredible success. The CP3 injection pump has proven to be extremely reliable and capable of supporting major performance with the help of the aftermarket who has modified them for increased volume and created dual and even triple pump kits. But, with tightening emissions standards, the LML platform was released in 2011 with an all new CP4.2, also supplied by bosch, which replaced the CP3. The new CP4.2 pump produces a much higher pressure (36,000psi at full load) than the CP3 could, offering a more controlled and more efficient burn in the cylinders, leading to cleaner emissions. Since it's release in 2011, the CP4.2 has shown a higher failure rate than the earlier CP3 design, mostly due to its design and tighter tolerances required to make that extreme injection pressure. There have been more than a few instances when the CP4.2 pump
The 2011+ LML Duramax trucks are not equipped with any kind of fuel lift pump and the stock CP4 high pressure injection pump has been known to fail even in stock applications due to fuel contamination and hard use.installation of a FASS Titanium...