Injector leakage limitation

A fuel supply system (100) for a combustion engine (180) comprises at least one fuel injector (110), a fuel pump (130) and a conduit (150) connecting said fuel pump (130) with said at least one fuel injector (110). An air intake valve (160) connects said conduit (150) to the atmosphere. The gas intake valve (160) is a one-way valve that prohibits sub-atmospheric pressures in said conduit (150) by allowing gas to enter said conduit (150) in case the pressure in said conduit (140) is lower than the atmospheric pressure.