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Got a Merc 150 efi. Changed the impeller and the pee stream is weak. Just a sputter. Never got any overheat alarms. Will it be ok with just a sputter? Before I changed the impeller there was nothing out of the telltale. Water flow out of cavitation plate is good.
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Many of the 2.5L models get their telltale from the THERMOSTATS. Hence there will be little (or no) telltale until or unless the thermostats open- telltale may "come and go" and when present will be SCALDING hot.