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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 hard­stal­la­tion of a FASS Titanium...

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