At the very bottom of the accelerator pump bowl on my 1978 cb750f is a check valve. It was stuck closed and would not allow the bowl to fill with gas. I soaked it for days and kept hitting it with compressed air. I started picking at the small plastic piece in the center of the bowl with a small screwdriver. It finally came out and revealed a tiny spring and ball. My problem is putting it all back in. I was wondering if the diaphram itself would keep it in position? I think I already know I am going to have to order a new pump bowl from Honda. Just wondering if anyone else has experienced this? Maybe that center plug could be sealed in but what would resist immersion in gas? Thanks.
