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Message: [QUOTE="Hotrodtractor, post: 1536866, member: 25"] Correct to a point - yes the exact volume that needs to flow out of the HPOP and into the rails and ultimately to any one injector and any given time is exactly the volume of oil the injector is consuming while injecting diesel fuel. My statement about stabilizing pressure because of the lower volume revolved more around the internal pressure waves inside the rail caused by transient nature of of the flows within the lines and rails. While there are some parallels - I don't think this analogy holds for this. The main difference being that air is highly compressible. When I am talking with a customer about installing industrial equipment - I always recommend an air accumulator with a check valve to isolate the accumulator from the plant lines. In some instances the machine/device can operate entirely on the stored energy of the accumulator for a single cycle before more the plant's system can recover and charge the local accumulator tank. The rails are not there for storage of compressed, pressurized oil, they are sized to take care of specific hydraulic harmonics as laid out in a stock application in the early 1990s. A lot of things have changed since then, and with the modifications we are now doing, I know the harmonics are different. There has been testing in the past of utilizing small hydraulic accumulators with some promising results, but that was at least a dozen plus years ago and I have no idea where that information has gotten to.... The way this is designed - it doesn't block or restrict flow - it simply takes up volume in the middle of a quite large oil reservoir. It might [I]redirect[/I] flow a bit going from the oil feed lines to the injectors, but it doesn't block or restrict that flow. I don't claim to be an expert either - but I do deal with it in some form almost on a daily basis. While the insert wouldn't absorb the energy - it could very easily redirect it and distribute it better dissipating the pressure wave. Totally a theory - I could set up a model and run the analysis, but quite frankly that's too much work to not get paid to do. LOL Agreed - data will make or break this. Not the explanation of how the the why - just that it [I]does[/I]. [/QUOTE]