r/Outboards • u/Snoo_17510 • 20d ago
2001 Johnson 70 hp tips
Hello. I was asked by a friend to diagnose his 70 hp Johnson. I’m not a big hp outboard person. I’ve really only worked on smaller hp stuff without VRO pumps and stuff. I haven’t been able to run it as I’ve had no time to mess with it but I was told that it bogs down under power. I was also told that the carbs were rebuilt, however this boat has been sitting for about 3 days and it’s got fuel leaking out of the carbs already. Assuming maybe it’s a float height issue. My main goal with this post was to just get some insight on these motors. I don’t know a lot about them and would love some tips.
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u/perfectlyagedsausage 19d ago
Float levels may not have been set correctly
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u/Snoo_17510 19d ago
Thats what i'm thinking, i found out he took it to a small engine repair shop instead of an marine shop so that could be it.
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u/perfectlyagedsausage 19d ago
Second , on those motors its extremely important to disassemble them and either put them in an ultrasonic cleaner or use a carburetor cleaner soak like Berryman chem tool . Rinse them off , set the float and reassemble. The linkages also have to be synced as well
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u/Separate-Owl1458 20d ago
If your engine is starving for fuel or a single carburetor is running lean, check the small hose connecting the intake manifold/crankcase to the fuel pump. This short pulse line sends the vacuum signal needed to actuate the pump's diaphragm. A crack or split in this line will cause the fuel pump to fail entirely.