Motor starts to go up and down after half a hour

JohnHendrikx

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May 3, 2022
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So I have work to do and hope to find the issue
Many thanks for the information and advice!

John
 

hlw49

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When it starts surging pull the fuel line from the tank loose and see if you are getting good fuel flow from the tank. I have seen fuel lines collapse when they get hot.
 
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zigyblu

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I would remove the fuel cap and see if it smoothens out and if it does your vent hole could be plugged. That should also help get a better flow of fuel to the inline filter.
 

peteco

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Also check the coil, when get high temperature, probably fail. In old cars it´s the same.
 

hlw49

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Try holding the governor arm still and see what it does. If the engine dies it is a fuel problem if it keeps running and smooths out it is a governor issue.
 
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