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Old 05-24-2023, 10:20 AM
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pfilean pfilean is offline
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Join Date: May 2007
Location: West Des Moines, IA
Posts: 1,932
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Sounds like a strange problem. I added a return line to my 61 and saw no change in how it ran except I have not had a vapor lock since. Which of course was the point.

Seems like for some reason you are just pumping fuel back through the return line and none to the carb. Are you using a filter with the return provision or a pump with the return provision. The filters have only a pin size hole for the return fuel to go through. I suppose the pumps are the same. That way the full pump volume cannot go back to the tank. Where are you checking pressure? After the filter or between the filter and pump? Where is the return line tapped into the pump output?