Patent ID: 8851051
Filing Date: 2014-10-07
Classification: F02M,F16L

Abstract:
1. A fuel supply system for an internal-combustion engine ( 3 ) in which the system ( 1 ) comprises a fuel supply tank ( 2 ), a fuel distribution manifold ( 5 ), and a pumping unit ( 6 ) which connects together the fuel supply tank ( 2 ) and the fuel distribution manifold ( 5 ); the pumping unit ( 6 ) comprising a fluid line ( 11 ) having a first, low-pressure portion (P 1 ), a second, high-pressure portion (P 2 ), a high-pressure pump ( 9 ) connecting together the first and second portions (P 1 , P 2 ), and a pre-supply pump ( 8 ) connected to the first portion (P 1 ); and the first portion (P 1 ) comprising a plurality of low-pressure branches ( 23 - 28 , 30 - 34 ), a plurality of fluid components ( 8 , 13 , 21 , 29 , 231 , 232 , 233 , 241 , 242 , 251 , 261 , 271 , 311 ), each of which has at least one connector ( 36 ) and at least one tubular coupling ( 40 ; 140 ; 340 ; 440 ), which tubular coupling is inserted partly into the connector ( 36 ) and partly into one of said low-pressure branches ( 23 - 28 ; 30 - 34 ) to connect together the component ( 8 ; 13 ; 21 ; 29 ; 231 ; 232 ; 233 ; 241 ; 242 ; 251 ; 261 ; 271 ; 311 ) and the low-pressure branch ( 23 - 28 ; 30 - 34 ); the system ( 1 ) being characterized in that each coupling ( 40 ; 140 ; 340 ; 440 ) comprises a plastic tubular body ( 145 ; 345 ; 445 ), sealing means ( 41 ; 141 ; 341 ; 441 ) interposed between the tubular body ( 145 ; 345 ; 445 ) and the corresponding connector ( 36 ), and means ( 42 ; 142 ; 342 ; 453 ) for axial locking of the tubular body ( 145 ; 345 ; 445 ) with respect to its connector ( 36 ) in a defined axial position, each coupling ( 40 ; 140 ; 340 ; 440 ) comprising axial stop means ( 44 ; 144 ; 351 ; 451 ) for the tubular body ( 145 ; 345 ; 445 ) with respect to its connector ( 36 ) in said defined axial position, the connector ( 36 ) having an end surface ( 38 ) and a cylindrical housing ( 39 ) which begins at the end surface ( 38 ) and houses part of its coupling ( 40 ; 140 ; 340 ; 440 ), the sealing means ( 41 ; 141 ; 341 ; 441 ) and the locking means ( 42 ; 142 ; 342 ; 453 ), the cylindrical housing ( 39 ) having an annular groove ( 45 ), the axial locking means ( 42 ; 142 ; 342 ; 453 ) being snap-action locking means ( 453 ) engaging with said groove ( 45 ) and being made in one piece with the tubular body ( 445 ).