Reply To: 1988 9.9 not pumping water

[Don]

Has this engine been used in salt water?  Have you changed the water pump?  Did you use the OEM pieces?   Unfortunately, there is a chance that the upper water tube grommet(s) have crushed due to salt build up.  This job requires pulling the powerhead and gearcase, could be some stuck bolts if it has been used in salt water also.

Nonetheless, you need to check everything else first before diving into this big project.