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Old 05 September 2012, 17:30   #11
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pumpin with the bulb vertical and not horizontal ?
So that gravity helps the valves shut.
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Old 05 September 2012, 20:10   #12
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As wavelength just said ,,, pump it vertical , most have 2 ball type one way valves fitted at each end of the priming bulb

Sometimes the non return ball or plug can just stick or not seal up proper allowing fuel to run back into the tank ,, sometimes if you squeeze the bulb too hard when priming and the bulbs been empty it can then generate an air bubble which can cause the valve to pass fuel back as most valves will seal with fuel but not air ,, best thing as was said is to hold it upright ,

There's also usually a very tiny non return valve in the fuel pump Diaphragm on the engine that can stick .
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Old 07 September 2012, 12:17   #13
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Not sure, but if the float needle in the carb is not shutting properly, would not that also result in a soft bulb?
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Old 07 September 2012, 12:26   #14
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Thanks for all the input chaps - after this I'm pretty sure the prob is external and likely an issue with the valve so will check it out further.
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Old 07 September 2012, 12:39   #15
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Quote:
Originally Posted by C-NUMB View Post
Not sure, but if the float needle in the carb is not shutting properly, would not that also result in a soft bulb?
Will have a soft bulb + a carb flooding fuel constantly all over pan...

Happy Boating
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Old 07 September 2012, 14:07   #16
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I still don't get why this works - but with mine sometimes you have to pump it really slowly as 'normal' priming doesn't seem to pull the fuel through. If you squeeze it and let it out as slowly as possible that will sometimes do it.

Sorry, I can't find a way of making that sound not dirty, in my mind anyway.

It may be a sign of an underlying problem, it's a mercury barb connector on a Barrus tank.

Glad you've got it sorted anyway
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