This same trick cannot be applied to the HPCR systems. One could get away with this type of ‘modification’ due to the style of pump, and the lower pressures that these pumps were limited to. Savvy pump tuners know that the early Bosch fuel pumps (‘VE’ pumps, and ‘P’ pumps) can be tricked into increasing the injection pressure by restricting the return fuel flow. Tip 1: Do not Pinch or Restrict the Fuel Return Line We’ve all heard the phrase ‘you can’t teach an old dog new tricks’ but we’re going to smarten you up by offering you our 5 tips to ensure the old diesel dogs out there can still perform a few new tricks. Transitioning from working on the old-school conventional (mechanical) diesel fuel injection systems to the modern, computerized High-Pressure Common-Rail (HPCR) fuel system requires a change in thinking and a change in diagnostic procedures.
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