A fluid connector assembly 10 for a fuel pipe of a motor vehicle comprises a plug 12 and a housing 11. The housing 11 has an end opening 23 and the plug 12 has a free end 26 for insertion through the end opening 23. The housing 11 also includes a seal housing portion 16 for receiving the free end 26 of the plug 12 and a coupling portion 17. The plug 12 includes first and second annular ribs 27, 28 spaced apart from each other and offset from the free end 26. The annular ribs 27, 28 are arranged to successively be held by a pair of grips 24 located inside the coupling portion when the plug 12 is inserted into the housing 11 in such a way that when the first annular rib 27 is retained by the grips 24 the plug 12 is sealed by seal means 18 in the seal housing portion 16 and when the second annular rib 28 is retained by the grips 24 the first annular rib 27 is housed between the coupling portion 17 and the seal housing portion 16.