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As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.
The CP4 is a high-pressure fuel pump, or injection pump, that debuted in 2011 in the Ford Powerstroke and GM Duramax engines. The CP4 was an updated model to the incredibly reliable and well-regarded CP3 pump. Unfortunately, the CP4 has long been plagued by failures, warranty claims, and expensive repair bills, even leading to a class-action ...
What Happens. The OEM Bosch CP4 pump that comes in your LML from the factory has a tendency to fail spectacularly, according to the recent lawsuit, these pumps began failing the day the first drop of diesel fuel landed in their tanks.
If you’re experiencing a hard start or no start, or are getting the following trouble codes; P0087, P0088, P0191, or P128E, a pump failure could be the problem. Remove the CP4 pump and then the fuel pressure regulator for inspection.
With some aftermarket solutions, you can fix most of the 6.6L LB7 Duramax’s most common problems. Here is our guide to the 7 most common 6.6L LB7 Duramax problems and how to fix them. 1. LB7 Duramax Injectors. The most notorious LB7 Duramax problem is their original injectors.
1. Issues With the Fuel Lift Pump. Duramax diesel engines use a direct injection fuel system. One of the most important parts of this fuel system is the fuel injection pump. The CP3 fuel injection pump that comes stock in most Duramax engines are reliable, but they are not very powerful.
The first thing you can do to prevent damage is change your fuel filter regularly. The stock Duramax filter is a spin on style which can easily be replaced in under 15 minutes, so there’s no excuse not to change it on time. 10,000-mile intervals may seem a bit excessive, but if it saves your fuel system, it’s worth it.