Strange Carb Leak

[bertsmobile1]

And your problem sounds like it is the washer , not the engine
The washer should have a bypass valve to allow the pump to keep on pumping when the trigger is closed
Sounds like your bypass is not working

 

[Tiger Small Engine]

And your problem sounds like it is the washer , not the engine
The washer should have a bypass valve to allow the pump to keep on pumping when the trigger is closed
Sounds like your bypass is not working

Yep, unloader valve not functioning correctly. Try to remove it and clean and reinstall and test. Sometimes you can clean them and they work again, sometimes you have to order a new one, remove and replace.