As mentioned in another thread I had a weeping Leak Back injector fitting, Return Fuel line fitting whatever name you want . its the little plastic bit on top of the injector that returns excess fuel to tank ........................... Here's the part number and description along with an Australian site supplying them, same as some model VWs and Audi's, trying to find a listing as a WK2 was near impossible other than some US sites, Jeep only supply the whole 6 with lines as a unit. which is 68211308AA ... The "O" ring is 6mm x 3.6 x 1.2
3lt Diesel A630 VM motor.... EXF
The fitting complete...........https://dieselsystemsaustralia.com.a...oss-references
and if you just want the "O"ring .......... https://dieselsystemsaustralia.com.au/collections/common-rail-spare-parts/products/cmr086-5-plastic-return-leak-off-oring-pkt-10