Fuel injector o ring
Be sure to clean any soot out of the holes to ensure a good seal. It's not easy but a pick, rag with a screwdriver and a shopvac reduced to a small hose are my go to.
I think one guy on here uses a shotgun brush from a gun cleaning kit, not a bad idea.
https://www.harborfreight.com/engine...-pc-63732.html









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