Hi guys having a headache right now trying to understand my asphalt sprayer. Have owned it 5 years and never an issue. It’s a marathon brand. Once I fire up the Honda motor let it warm up and go to open the ball valve ( allows material to be sucked from tank through the pump and back into the tank until I use the wand) the motor revs high like it under stress to keep the pump rotating and eventually it dies. I took the face plate off the pump and the fresh material is getting to it as it poured out into a container nice and liquidity (black Mac) and also opened up and drained the filter just after the valve so I’m not sure why or where my problem is occurring?
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