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I have found that the dual fuel line modification reduces this. The rear cylinders are getting lower pressure and hotter fuel. Adding a supply pump to the fuel system helps even more.

yes, the Cummins 250 are noise, but the advice on the compressor is smart too. Does it bang all of the time or just noticeable at idle? I have seen low mile motor eat a cylinder from sitting around. It is most likely bad fuel or just gummed up injectors from sitting. put some ATF in the tank to...