Why is my fuel pump on my scooter only coming on intermittently?

by Brian Richards
(Alabama)

The fuel pump on my 2008 Yamaha Morphous scooter comes on intermittently. I can go out and start it up right now, ride around the block, and shut it off. Turn the key back on and I won't be able to hear the hum on the fuel pump.


Any ideas what might be wrong?

Comments for Why is my fuel pump on my scooter only coming on intermittently?

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Nov 29, 2014
 2008 morphus fuel pump NEW
by: James Devane

My brother and I bought a new 2008 morphus at the same time his started not coming on after it warmed up first with 6000 miles on it then with 900 miles on mine the fuel pump started the same thing I replaced my pump for $170 so far no problems, I called yamaha about it they could care less about there customers satisfaction I will not buy another yamaha product, join me an the scum may open there eye's. Thanks
Sep 19, 2012
 RE: Morphous fuel problems NEW
by: Dean Marcaurelle

Yes, Morphous IS fuel injected. Does anyone know where the fuel filter is in a morphous? I have had mine 3 1/2 years --- with flawless performance -- til today. Sudden loss of 1/2 to 2/3 of my power. Not missing or chugging -- just would not respond adequately to increased throttle. Dies going uphill. Any thoughts?
Apr 14, 2012
 update NEW
by: Anonymous

Our scooter was put in the shop and recieved a new pump. So far so good.
Apr 14, 2012
 2008 Morphous Fuel Pump NEW
by: Anonymous

Has the 2008 Morphous intermittent fuel pump issue been solved? I believe I just experienced the same thing (~900 miles on my new to me scooter). Was stranded for ~1 hour due to no fuel pump coming on when ignition turned on... then after ~ an hour of troubleshooting in a parking lot... presto, comes on for no rhyme or reason... it was Friday the 13th though. My scooter also suffers from initial cold start erratic idle, but if shut off then started back up immediately, it purrs like a kitten.
Mar 20, 2011
 2008 Morphous Fuel Pump Issues
by: Anonymous

Here is the text to a NHTSA Complaint I just submitted concerning my 2008 Morphous:

In warm weather, fuel pump fails after getting hot. Today, after a 20 minute ride at interstate speeds, I arrived at my destination. The ambient temperature was around 75 degrees. After 2 hours, ready to return, I tried to start the scooter, no joy. After removing the plastic helmet tray under the seat, I poured chilled water on the fuel pump atop the gas tank, and then the scooter started right up. Had this problem last summer but never figured out what the issue was. Always just had to let it sit for several hours before it would start again. I got the idea to pour water on it after reading several posts from other Yamaha scooter owners who have mentioned fuel pump issues. The bike only has 3400 miles on it. It does not seem that a component like this should begin to fail after that few miles. It is, or course, out of manufactures warranty due to age.
Sep 13, 2010
 Pressure Sensor
by: Jim Zeiser

Correct me if I'm wrong but isn't that scoot fuel injected? It probably has a sensor that tells the pump when the line pressure has dropped off and needs the pump to run.

If the line pressure is adequate when you turn it on, the pump won't come on until the pressure drops... like when the scooter starts running and you can't hear the pump over the motor.

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