Knowing this, GM engineered a filtering system up to the task, right? Heavy equipment and highway tractors typically feature multi-stage water separators and fuel filters. These engines must be properly maintained or they suffer the consequences. The result of much higher precision, operating pressures and speeds is that modern fuel systems are much more intolerant to the fuel contaminants – including water – that we will discuss in this article. Really, the performance requirements of the new common-rail diesel injectors absolutely blow away any conventional distributor injection pump diesel fuel systems. They are capable of up to five injection events per cycle and run up to 26,500 PSI. The newer Duramax injectors are even faster and operate at higher pressures. Additionally, the LB7 injector was easily 10 times faster than its conventional counterparts – the response time from when the injection control module energized the injector to when it began delivering fuel was an incredible 150 millionths of a second and it was capable of two injection events per cycle. What’s more, the Duramax injector has to seal tight at these pressures unlike the injectors of conventional, distributor injection pump systems. Then compare those numbers to the original LB7 fuel injector that operated in the range of 4,500 to 23,200 PSI! Consider that a typical conventional diesel fuel system prior to the Duramax operated at fuel pressures of 1,200 to 1,500 PSI. In fact, just the opposite: today’s fuel injectors and other components require much higher tolerances. But to think that these engines can handle not being maintained as well as their less sophisticated forerunners is far from the truth. In a sense that is true: today, we have more feedback than ever coming from our engines. One might think that these more sophisticated engines can look after themselves a little better. Duramax engines are significantly more sophisticated than Grandpa’s tractor.
The investment required to properly maintain the fuel system meant avoiding the corrosion and scoring caused by water when it runs amok in the fine-tolerance components of a diesel engine. Experience had taught him that draining the water separator could mean the difference between a well performing engine and one with problems – or one that didn’t run at all. This man, who wouldn’t hesitate to fix things with haywire or binder twine was, however, a purist when it came to maintenance. Grandpa used to lecture me about the importance of draining the water separator on his farm’s diesel tractor. Duramax Owners PLEASE READ this article from Maxxtorque, it contains critical information that every Duramax owner should know.ĭmaxstore's personal recommendation at bottom of article.
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