FUEL SYSTEM FOR COMBUSTION ENGINE AND A METHOD FOR REDUCING THE RISK OF OPERATIONAL DISTURBANCE CAUSED BY PARAFFINED FUEL IN THE FUEL SYSTEM

摘要

The invention pertains to a fuel system for a combustion engine (2), which fuel system (4) comprises a first fuel tank (20), a second fuel tank (22), a first fuel conduit (36) arranged in connection with the first fuel tank (20) and the second fuel tank (22), a second fuel conduit (40) arranged in connection with the first fuel tank (20), a main feeding pump (26), arranged to feed fuel from the first fuel tank (20) through the second fuel conduit (40) to a high pressure system (19), a transfer pump (28), arranged to feed fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel conduit (36), and a pre-filter (30) arranged downstream of the transfer pump (28). A first electrical engine (Ml) is arranged to operate the transfer pump (28), wherein the transfer pump (28) is reversible, so that the flow direction through the pre-filter (30) and the first fuel conduit (36) may be reversed when a risk of fuel paraffination has been identified. The invention also pertains to a method to reduce the risk of operational disturbances caused by paraffinated fuel in a fuel system.