Fuel line won't charge

[asno]

Hello,

I own a 78 GS 550. I recently had to take off the gas tank to fix a minor leak. I fixed the leak with a touch of seal all, but now it will not start. The fuel line will not charge. I have tried setting the petcock to prime, but it appears that their is air pressure forbidding the gas from flowing freely and filling the tube. When I remove the fuel line from the petcock, fuel runs freely out of the petcock. Does anon have any suggestions as to how to fill my fuel line?

[bwringer]

Air bubbles in the fuel line are irrelevant.

You may have pinched or blocked the bowl vent tubes.

The float needles may be stuck, too -- has it been a while since the bike was started?

[LarryA_Texas]

My first thought is that the carbs are already full. If the bowls are full of fuel the needle valves close and fuel won't flow. If the carbs need gas and the petcock is working then you should look at the valves inside each carb, which may be stuck. (all four sticking at once would be pretty unlikely but nothing is impossible)