by sleeve, you mean the fuel line where it connects I assume..? sure it's tight?, no o-ring that I know of. grab a 17mm wrench and make sure it's tight.
GRIM REAPER DURAMAX, "BRODY" EDITION
05 Duramax LLY, 4wd, crewcab, LT, black and debadged, BMS/Burkhard built LLY with Howard's Xtreme Duty rods, cam/crank pin fix,cut pistons, DPR HV oil pump, ARP head studs, MPI twins, SCIII/1050,MBRP 4" straight, EFILive by Rob,Rear diff upgrade from Tony, 18" Gear Alloy Double Pumps on 285 Nitto Terra Grapplers,Rhino lined, SD tie rod sleeves, 5% tint all around, Kennedy dual pumps/pickup, Optima battery, Autometer C2 60 boost/1600 pyro/100 oil on a-pillar, ATP spring clamps, Fumoto, Bilsteins