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Old 19 May 2018, 08:52   #1
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Evinrude 4hp - fuel pump issue

Hi,
Having made up my new fuel line and after lots of rope tugging and snorting ether I've got my little Evinrude 4hp Yachtwin running. However it seems to be squirting fuel out of a vent on the fuel pump, has anyone got any advice/knowledge before I start to dismantle it??
Thanks in advance.
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Old 19 May 2018, 16:53   #2
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You mean Squirting out of the external fuel tank vent?
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Old 19 May 2018, 17:02   #3
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If so it sounds like you got the primer bulb fitted the wrong way thus when your pumping the primer your pressurising the fuel tank and fuel is being forced out the vent
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Old 20 May 2018, 02:56   #4
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Quote:
Originally Posted by Lee1 View Post
You mean Squirting out of the external fuel tank vent?
No, squirting out of a small vent on the fuel pump.
The primer bulb is definitely fitted correctly.
I suspect that the fuel pump diaphragm has stretched over time, it's just a question of whether I rebuild the pump or fit a cheap replacement pump I suppose.
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Old 20 May 2018, 23:55   #5
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I don't think they have an air vent on the pump, they are a pain to rebuild have a look on leeroys ramblings Web site it's very helpful personally I would buy a new one
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Old 21 May 2018, 08:36   #6
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Fuel pump diaphram is very easy to change, I would try that next, videos on how to on YouTube. Your kit will problem come as a multi kit to fit a selection of pumps.
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