5-Piece Injector Rail Fuel Line Cap Set

Caps used to block off the fuel rail during fuel pressure diagnostics in 2003-2022 Cummins, 2001-2022 Duramax, and 2008-2022 Ford EnginesHelps in identification of faulty diesel fuel injectors and used to diagnose engine knock soundsInstall the cap on the fuel rail in the place of the injection lineWhen the cylinder with the failed injector is capped, the rail pressure will rise and the vehicle will startSet comes with five different caps