Hi I have a Mariner 200hp, I use it infrequently and I wonder if this is the reason I am having problems with the water circulation.
After every time I use it I run fresh water through the engine via mufflers, on the last two occasions the tell tale did not appear.
I took it in to the dealer I bought it from and they changed the impeller as a precaution.
They ran it in the yard and all was well.
I used it out at sea the following weekend and it was fine.
I took it home to flush it out and the tell tale was not working!
Am I doomed?
Does anyone have an explination they could offer?
Thanks in advance.
I have a similar engine and problem... the flushing muffs just didnt get enough water/pressure in there to make it work. try putting the hose in the flushing port at the rear of the engine (engine off) and make sure there is plenty of water pressure in the hose - that should show you if all is ok. Now i only flush through the port after use with engine off or in a tank.
Hi, I used the hose connector and it did not make any difference.
I was talking it over with the old man yesterday and I am on the lookout for a large container/ water butt to lower the leg into.
Will let you know what happens.
The hose at home has enough pressure, and so does one at the yard where I keep the RIB. However the tap nearest to where the boat is parked just doesn't have enough pressure.
I panicked the first time, but wen I moved it to the other tap it was normal again. I just have to make sure I stop on the way in to fush the engine rather than do it after I'm parked up.
I am on the lookout for a large container/ water butt to lower the leg into.
I use an old IBC container with the lid cut off .. has a tap at its base aswell, but a bit of a PITA to store when not in use and you can go have lunch while you fill it, but free if you know where to look
and you can go have lunch while you fill it, but free if you know where to look 
