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Author: Subject: fuel diagnostic?
Santiago
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[*] posted on 11-16-2015 at 09:10 PM
fuel diagnostic?


Pump the primer bulb coming out of the tank and the 15hp 2 stoke Yammie starts right up and then runs out of gas. If I keep squeezing the bulb, will run. Am I right to assume my fuel pump diaphragm is kapoot?
will break down this weekend and check it out.
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Tioloco
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[*] posted on 11-16-2015 at 09:45 PM


Sounds like that is it.
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captkw
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[*] posted on 11-16-2015 at 09:50 PM
Santiago


Hola,more than likely..also check the complete fuel line and under the cowling (hood) for any loose hose ends...if your fuel line is a tempo, or attwood or moeller toss it in the trash and get a oem or serria !! BTW how is that shift shaft hole repair holding up ??? that kid is growing faster than a greyhound runs....

[Edited on 11-17-2015 by captkw]
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DaliDali
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[*] posted on 11-17-2015 at 05:58 AM


It's the fuel line.....
The "impermeable" membrane inside the line has melted, reducing the flow of fuel to the motor, to the point of it won't run.





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soulpatch
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[*] posted on 11-17-2015 at 06:37 AM


I had the exact same problem. Air leak at the hose fitting.
Cut hose, installed spare fittings and I was good.
Next trip, new hose, new spares.




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Santiago
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[*] posted on 11-17-2015 at 08:22 AM


Left out something that may be diagnostic: Last trip was to Fordyce Lake near Truckee - the road in is legendary - 1.5 hours to go 7 miles towing a 15' Gregor. The motor was laying in the back of the truck and suffered a LOT of bouncing around.
Will first check the hoses and fittings before replacing the diaphragm.
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vandenberg
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[*] posted on 11-17-2015 at 10:36 AM


Had that identical problem. Hose had a leak and was sucking air instead of fuel.. Simple fix.



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ncampion
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[*] posted on 11-17-2015 at 11:39 AM


I agree with others regarding the hose/fitting leaks as most probable. If you have an electric fuel pump, pressurize the lines/fittings and look for leaks, even a small air leak will cause the problem as air is much easier to flow than fuel. The o rings on the fittings are often the culprit.



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