A Mercury Sport Jet 240 EFI. If I start the motor first May 09, 2011A Mercury Sport Jet 240 EFI. If I start the motor first and then turn on water it runs fine and no problem. If I turn - Answered by a verified Marine Mechanic Mercury Marine 240 EFI Jet Drive Service Repair Manual Mercury Marine 240 EFI sport jet service manual on CD. Sport Jet Drive Service Repair Manual filled with high quality diagrams and instructions on how to service and repair your Mercury Marine Jet Drive from top to bottom!