Tell-tale not flowing when throttled up!

[ekole51]

Greeting's all. I have a question about the pilot hole and water flow. I have a 2002 DF40 and recently took it out for a run. I had good flow from tell-tale when idling, but when I throttled up to a reasonable speed, the water decreased and appeared to stop flowing. I never got a warning for overheating. I dropped it back down to idle and water began to flow out again. Isn't there supposed to be a steady flow while you are throttled and moving? I'm new to the boat scene so any help would be appreciated.

[Vitamansea]

Take a piece of .040" safety wire and run it up into the telltale hole with the engine running about 1 foot. Then ream it and pull it out, it should flow, if not? change your water impeller because the tell tale will flow if the thermostats are open or not.

[ekole51]

Ok thanks, will try it.

[keakar]

yes there should always be a good flow and stronger as it runs faster

often trash will get into it and block it so always stick a small wire in it first to make sure that's all it is.

from your description it could be some trash but it could also be a worn out water pump. they get weak and stop pumping as much at higher speeds because the impeller has no spring left to it or the rubber has worn down