We recently introduced the TDS-3017933 new solenoid shut of assembly. This assembly as can be seen in the phots has a modified relief radius then the assemblies before. This assembly makes sure the ECM switch introduces on the new fuel pumps does not foul with the solenoid assembly. A plate is introduced with a new design of the disc valve between the coil & housing giving better and more efficient sealing of fuel.. This assembly & part number will replace all the existing assemblies coming on the K 19 / K 38 / K 50 engines in the future.