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Old 08-06-2015, 07:28 AM   #1
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Yamaha scooter


I am working on a yamaha scooter. Should there be fuel pumping out of the fuel pump when I turn the motor over? And if so what would make it not pump out?
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Old 08-06-2015, 07:59 AM   #2
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I'm not much of a scooter expert==but most motor cycles do not have fuel pumps--gravity feed---

Does this one have a pump?
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Old 08-06-2015, 11:35 AM   #3
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Likewise, my first thought was "what fuel pump", but makes sense as scooters are configured differently than motorcycles, so gravity might not work. Besides that, you said fuel pump, so it must have one! So, to your question, where is the fuel coming out of the pump? The line going to the engine? If you're cranking the engine with the line disconnected, and don't want it to pump, you probably just need to pull a fuse if it's electric, or disconnect the suction line from the crankcase if it's a pulse type. If the fuel is coming out a screen in the pump, I would guess that the diaphragm is bad.
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Old 08-06-2015, 06:12 PM   #4
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It is a brand new fuel pump and I have two that are doing the same thing.
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Old 08-07-2015, 09:48 AM   #5
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Did you check the neoprene (rubber) lines? The inside may be deteriorating from ethanol in the fuel.

Also did you check the filter?

Last edited by 47_47; 08-07-2015 at 09:49 AM. Reason: added
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Old 08-07-2015, 07:50 PM   #6
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Cant be a filter because it flows good to the pump but just wont come through. I have two the are doing the same thing.
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