When it starts acting up try closing the choke 1/2 to 3/4 and see if it improves.
This basically does two things,
First it reduces the amount of air which creates a richer mixture
Second the choke plate reduces the space for air to get into the engine which increases the air velocity and causes a harder pull on the flow of the fuel through a partially plugged passage or jet in the carb.
If doing this improves how it is running then you have confirmed you need to do further work to your fuel system.
Your observation of fuel at the bowl on the pump is only sort of testing part of the circuit.
If for example there is a chunk of crud obstructing the fuel flow past the needle and seat or your float is set too low your observation at the bowl will not tell you this.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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