I have the 1975 formula thunderbird 19 footer mercruiser gm250 165 hp
that hasn't run well since the hurricane. i have been helped by the
group here also.

after all the cranking and plug changes, fuel supply change i know it
is the floats in the 1 bbl. mercruiser rochester carb. when the engine
runs the air/fuel adjustment screws do not work. the exhaust shows
signs of running rich by the black soot on the water.

the boat will run fine for a day and then not start for a few days. i
am searching now for a low cost 1 bbbl rochester carb for my boat.

anyone have a carb on the garage shelf ?

sonofadocker


Rand_man50 via BoatKB.com wrote:
OK, I got the previous problem figured out, but now it cranks forever and
wont start. When I spray starter fluid in the carb, it acts like its gonna
start. I cant see any gas being sprayed into the carb when its cranking or
when I pump the throttle, so I figure it's probably the fuel pump or a
clogged fuel line. I think the fuel pump is on the outside of the tank so
it's not hard to get to. How do I check to see if its good?

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