I am not sure why you should want to reduce the capacity of your diesel pump. Perhaps you would enlighten me?
The diesel system always has a surplus capacity to allow more diesel to be pumped to the injectors than they could possibly need. This cuts the chances of vapour locks, air bubbles, cavitation and suchlike and as the surplus is returned to the fuel tank it is also an essential part of the cooling of the fuel system and it is for this reason, certainly in hot weather, it is unwise to operate a diesel engine with less than half a tank of fuel.
In the case of a conventional diesel pump the surplus fuel flow is governed by valves and graded holes but in the case of the modern common rail system the flow is mostly controlled by a pressure regulator and the rail pressure is constantly monitored by the engine management system via a pressure sensor.
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I am not sure why you should want to reduce the capacity of your diesel pump. Perhaps you would enlighten me?
The diesel system always has a surplus capacity to allow more diesel to be pumped to the injectors than they could possibly need. This cuts the chances of vapour locks, air bubbles, cavitation and suchlike and as the surplus is returned to the fuel tank it is also an essential part of the cooling of the fuel system and it is for this reason, certainly in hot weather, it is unwise to operate a diesel engine with less than half a tank of fuel.
In the case of a conventional diesel pump the surplus fuel flow is governed by valves and graded holes but in the case of the modern common rail system the flow is mostly controlled by a pressure regulator and the rail pressure is constantly monitored by the engine management system via a pressure sensor.