transfer pump 12 and upstream from the transfer ejector 13 while the engine 2 is in operation the fuel conveyed towards the feed ejector 15 from the transfer circuit 10 is entrained by suction by means of the suction pump 3 so as to satisfy the fuel requirements of the engine 2 more particularly in fig2 and 3 the feed ejector 15 is an ejector of conventional structure comprising a nozzle 17 for admitting a primary stream 18 of fuel towards an inlet 19 of a main channel 20 having a constriction 21 an outlet 22 from the main channel 20 serves to exhaust a stream of fuel 23 from the feed ejector 15 into the feed circuit 4 the feed ejector 15 has a secondary fuel flow channel 24 in the embodiment shown the secondary channel 24 opens out into a chamber 26 provided upstream from the main channel 20 and having the nozzle 17 passing therethrough the feed ejector 15 is dimensioned to enable fuel to be entrained through it under the effect of the suction generated by the suction pump 3 at a rate and at a pressure that are suitable for satisfying any fuel requirements of the engine the feed circuit 4 is in fluid flow communication with the feed ejector 15 via the outlet 22 of the main channel 20 the capacity of the suction pump 3 is sufficient to generate high pressure such as the above mentioned pressure of the.