Info needed

I am a far cry from being a engine repairman. I need some advice from someone who knows a lot more than I do.
I had a problem on the water yesterday after many years of no problems. After getting home I found the fuel bulb on my 150 Johnson is not staying tight and my motor will start to run rough after a few minutes. when I squeeze the bulb a few times it will straighten right out and purr. Here is the thing. I cannot find a leak in the gas line anywhere. I know it s getting air from somewhere. I am going to replace the whole fuel line anyway because it is due, my question is could this be something else that I am overlooking?
Thanks in advance for your input.

the bulb does not stay hard after the engine runs a little. if the engine continues to run while you pump the bulb, your problem is a bad fuel pump.

I'm just guess but if the fuel line is quite few year's old it could be getting dry rotten and bleeding seeping air. Just a thought.
Dog

If you have a main tank and a reserve tank your valve to switch tanks could be leaking by too. A buddy of mine had that problem. Gilly is probably right about the fuel pump though. I have had the same symptoms and the fuel pump solved my problem.

[QUOTE=dmase;368933]I am a far cry from being a engine repairman. I need some advice from someone who knows a lot more than I do.
I had a problem on the water yesterday after many years of no problems. After getting home I found the fuel bulb on my 150 Johnson is not staying tight and my motor will start to run rough after a few minutes. when I squeeze the bulb a few times it will straighten right out and purr. Here is the thing. I cannot find a leak in the gas line anywhere. I know it s getting air from somewhere. I am going to replace the whole fuel line anyway because it is due, my question is could this be something else that I am overlooking?
Thanks in advance for your input.[/QUOTE]

When is the last time you replaced the primer bulb? The bulb it self could be bad. They do go bad over time. I have a similar problem. My primer bulb goes soft when sitting to long in the sun. Only when it is warm out side. In the 80's. But once I change my primer bulb, I am good for a year or so. If you replace your primer bulb and you still have problems, then yes, it could be your fuel pump. Or some restriction from your tank. A new primer bulb is a cheap fix before taking it in to a shop.

Fuel pump