Hi, I have a mikuni 22 that I'm having some problems with. When I try to feed it fuel, fuel doesn't even go down the line into the carb. But the weird thing is, that when the carb is attached to the manifold it does this, but when it's off, it flows perfectly fine. I tried cleaning it twice, changing idle, and even swapping fuel lines. But to no success. Any help would be much appreciated.