I recently replaced the primary fuel filter on my Yanmar ysb12 engine. I bled the fuel line but the injector pump does not fill the high pressure side. It has a new injector pump last year and worked fine before stored this winter. I bled the high pressure side per the owners manual, but no fuel comes out the check valve. The pump works when the check valve is removed. How do you intall the chech valve so that it works correctly?