I haven't had time to pull the pump off yet, but it feels like I may have a blown gasket (I can feel high-pressure air near the flywheel when the pump is running.)
After 8 years, the pump on my US General 560V from Harbor Freight has crapped out.
I googled around and it seems this pump is a T29S / B4900. The cheapest I've been able to find it for is about $500, which seems pretty excessive for a repair cost, given I paid a couple hundred more for the...