Pipe connector and fuel injection system

A pipe connector (24) comprising a first fitting (25) connectable to the first double wall pipe, the first fitting (25) comprising a first portion (45) connectable to the inner flow space and a second portion (46) connectable to the outer flow space of the first double wall pipe, a second fitting (26) connectable to the inner flow space of the second double wall pipe, a third fitting (27) and a leak channel (31) arranged in flow connection with the second portion (46) of the first fitting. The pipe connector is provided with a closure member (34) having a first position, in which flow of fluid from the leak channel (31) to the leakage outlet (32) is prevented, and a second position, in which flow of fluid from the leak channel (31) to the leakage outlet (32) is allowed, which closure member (34) is arranged to move from the first position to the second position when fluid pressure in the leak channel (31) rises above a certain limit. The pipe connector is also provided with a blocking means (28) for preventing flow of fluid from the outer flow space of the second double wall pipe from passing through the pipe connector (24).