Patent ID: 6868838

Claim:
A fuel injection system for a diesel engine which is cooled by a cooling water circuit, comprising a storage tank, a distribution circuit, an injection harness and a collection circuit, the distribution circuit including a pump ensuring the transfer of flow under pressure of fresh fuel from the storage tank to the injection harness, a selective heating device for selective heating of the fresh fuel before introducing the fresh fuel into the pump, the injection harness injecting a first portion of the fresh fuel into the engine, a second portion of the fresh fuel forming a non-injected fuel flow, the collection circuit including a device for cooling the non-injected fuel flow and ensuring the selective return of the non-injected fuel flow to the storage tank, the selective heating device including a recycling line and a directing component allowing selective recycling of the non-injected fuel flow upstream from the pump, the recycled non-injected fuel flow being mixed with fresh fuel flow coming directly from the tank, the pump, supplied with fuel by the upstream fuel flow, being cooled and/or lubricated by a stream diverted from the upstream fuel flow, the diverted stream being mixed with non-injected fuel flow, wherein the directing component selectively adopts a first position and a second position, directing the non-injected fuel flow and the diverted stream, mixed together, upstream from the pump in the first position, and to the storage tank in the second position.