Reply To: no water flow 63 evinrude 40hp big twin

[frankr]

Sorry, but gotta ask this: Where are you running it? Bucket, barrel, on the boat on the lake, where? We get a lot of inquiries about the 40hp not pumping and it often is just a matter of not enough water to the pump.

If you are positive you have it deep enough in the water, check the thermostat. People love to take them out and throw them away—along with the plastic thermostat housing and check valve. That’s just the wrong thing to do.

Water discharge normally varies according to thermostat state. But there should always be at least some spray out the exh relief.

It is hard to plug up the cooling system on those motors, but I suppose it is possible. But unlikely.