Cant find serial number anywhere!

markmcintyre · Aug 27, 2015

Hi i have a mid to late 70s model Mercury 500 thunderbolt 50hp 4cyl.
I am unsure of exactly what year as i cant seem to find my serial number in any of the serial searches.
The number is 8049265.

I am also currently trying to find a replacement fuel pump as the motor is stalling, unless i am continuously squeezing the primer.
The pumps are hard to find so im wondering, if i lose all hope, can i replace it with an aftermarket fuel pump of some sort?

HEEELLLPPP

haventaclue · Aug 27, 2015

Ah Australian, have a look here,and you probably only need a diaphragm, http://www.marineengine.com/parts/mercury-outboard-parts/500-50/8030090-thru-8063984-aus.

markmcintyre · Aug 27, 2015

Thanks again mate.
could it have anything to do with the fuel line check valve? Or do i have to pull the carbs apart?

markmcintyre · Aug 27, 2015

I was told its a possibility, dont know how true that is. If so ill by pass it tomorrow and test it if not ill order some diaphragms

haventaclue · Aug 27, 2015

Does the primer bulb stay firm after priming but before starting?It will soften when engine is running.Needing to keep pumping the primer to keep the motor running is usually an indication that the fuel pump diaphragm is weak.Pull it and have a look for pinholes.
If you are getting fuel and there are no fuel leaks,I'd leave the carbs until absolutely necessary

markmcintyre · Aug 27, 2015

Oh i though the diaphram was in the carb though?
where abouts are the diaphragms located. Cheers

haventaclue · Aug 28, 2015

My mistake

.The fuel pump is integral in the carbs.Down at no.41 on this page is the repair kit,so the carbs need to be dismantled,so you might as well do a cleaning job on them as well,soak and blow through with air. http://www.marineengine.com/parts/m.../8030090-thru-8063984-aus/carburetor-assembly.

markmcintyre · Aug 28, 2015

Awesome! Have ordered the new diaphragms. Thanks matey!

Cant find serial number anywhere!

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