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In an arrangement for handling the fuel in a common rail fuel injection system of an internal combustion engine, wherein fuel is supplied from a tank via a fuel delivery line including a first fuel filter, a low-pressure pump arranged upstream from the first fuel filter and a high pressure pump arra

In an arrangement for handling the fuel in a common rail fuel injection system of an internal combustion engine, wherein fuel is supplied from a tank via a fuel delivery line including a first fuel filter, a low-pressure pump arranged upstream from the first fuel filter and a high pressure pump arranged downstream of the first fuel filter to a high pressure fuel rail from which the fuel is distributed to the cylinder of the engine, a bypass line extends from the high pressure fuel rail to the fuel delivery line and includes a second fuel filter and a heat exchanger which is operatively connected to a cooling circuit of an air conditioning system or to a cooling circuit of the internal combustion engine.

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What is claimed is: 1. An arrangement for handling the fuel in a common rail fuel injection system of an internal combustion engine, including a fuel tank (10), a fuel delivery line (2) extending from the tank ( 10) to a high pressure fuel rail (4) for supplying high pressure fuel to the cylinders

What is claimed is: 1. An arrangement for handling the fuel in a common rail fuel injection system of an internal combustion engine, including a fuel tank (10), a fuel delivery line (2) extending from the tank ( 10) to a high pressure fuel rail (4) for supplying high pressure fuel to the cylinders of the internal combustion engine, a first fuel filter (7.1) disposed in the fuel delivery line ( 2), a low-pressure pump (1) arranged in the fuel delivery line (2) upstream of the first fuel filter (2) and a high-pressure pump (3) arranged in the fuel delivery line (2) downstream of the first fuel filter (7.1), a bypass line (5), which extends from the high pressure fuel rail (4) to the fuel delivery line 2 and includes a heat exchanger (6) and a second fuel filter (7.2), for returning fuel into the fuel line (2), the bypass line (5) including a heat exchanger (6) operatively connected to one of a cooling circuit of an air conditioning system or to a cooling circuit of the internal combustion engine. 2. The arrangement as claimed in claim 1, wherein a first nonreturn valve (8) is provided within the bypass line (5), downstream of the injection rail (4) and upstream of the heat exchanger (6). 3. The arrangement as claimed in claim 1, wherein the heat exchanger (6) and the second fuel filter (7.2) are arranged in a common housing. 4. The arrangement as claimed in claim 1, wherein the heat exchanger (6) is mounted to the vehicle body or directly to the internal combustion engine, upstream of a charge-air or water cooler and/or upstream of an air-conditioning condenser. 5. The arrangement as claimed in claim 1, wherein the heat exchanger (6) is mounted to a charge-air duct of the internal combustion engine and is operatively connected to said duct. 6. The arrangement as claimed in claim 1, wherein the second fuel filter (7.2) is arranged downstream of the injection rail (4) and upstream of the heat exchanger (6), as seen in the direction of flow. 7. The arrangement as claimed in claim 1, wherein the heat exchanger (6) is air-cooled and is operatively connected to a charge-air cooling system. 8. The arrangement as claimed in claim 1, wherein a second nonreturn valve (9) is provided within the bypass line (5), downstream of the heat exchanger (6) or downstream of the second filter (7.2). 9. The arrangement as claimed in claim 1, wherein the bypass line (5) is connected to the fuel line (2) downstream of the low-pressure pump (1) and upstream of the first fuel filter (7.1). 10. The arrangement as claimed in claim 9, wherein the first fuel filter (7.1) and the second fuel filter (7. 2) have a common housing. 11. The arrangement as claimed in claim 1, wherein the injection rail (4) of the internal combustion engine has a return line (12) which is connected to the bypass line (5) for returning excess fuel from the injectors (11.1-11. 4) to the bypass line (5).