Fuel pump diaphraghm had a tear. On one occasion, priming with primer bulb, fuel filled the combustion chamber and engine would not turn over. Took plugs out and engine turned over and started again. Got new Yamaha fuel pump. Engine will not start. Gasket from fuel pump to head looks o.k. This pump is vacuum driven? Could fuel have leaked from old pump to somewhere that could stop the vacuum? Anything that needs to be drained?
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1998 130hp two stroke. Replaced fuel pump, and will not start
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Yes, the pump works on vacuum: https://www.boats.net/catalog/yamaha...8/130tlrw/fuel
Did you remove the spark plugs and CRANK / SPIN over the engine (plugs out) to remove excess fuel that made it into the engine?
This is to include fuel in the CRANKCASE, not just the top end.
Sounds like it's flooded...
The spark plugs also need to be dried and cleaned.
The engine should spin over with the ignition safety clip removed (kills spark).Scott
1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR
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that is something I never thought about before,(How to clear out the extra fuel from crankcase).
there should be crankcase re-circulation check valves and lines to help do that over time.
but then I never knew about anyone priming a motor with a defective pump so much that it locked up a motor before.
the pump should only run off of one cylinders pulse port, so it should not keep the motor from starting. just flooding one cylinder should not stop a motor from starting
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Originally posted by 99yam40 View Postthat is something I never thought about before,(How to clear out the extra fuel from crankcase).
there should be crankcase re-circulation check valves and lines to help do that over time.
but then I never knew about anyone priming a motor with a defective pump so much that it locked up a motor before.
the pump should only run off of one cylinders pulse port, so it should not keep the motor from starting. just flooding one cylinder should not stop a motor from starting
Turn the engine upside down, pull it a couple of times and watch ALL the fuel come out. A blast with the air compressor works. Even then, once it starts, smokes like a pig till all the oil/fuel is burned up...
As for priming till it locks up, if the pump is leaking into the crankcase, and you keep pumping fuel, the fuel is going somewhere. Apparently into the top end at least.
Cranking with the plugs out assures no hydraulic lock/damage and eventually gets most of the fuel out..Scott
1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR
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