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That could be a partially occluded tank vent (like with spider webs). The tank can't vent properly and eventually overcomes the mechanical fuel pump and the carb is starved. Because it's only a partial blockage, tank pressure equalizes under little load. Dissemble the gas tank vent and blow it out. If crap comes out, that's the likely answer. Switch to a larger diameter hose (I use 5/8" ID) and get a fine mesh vent screen.
If it doesn't, change the fuel/water separator or fuel filter. You should do this anyway.
Lastly, crud in the tank itself can gradually occlude the pick-up tube. Same deal to fix that...
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