I was told I was supposed to use a vented gas cap..........which I do not at this time. What problems do you encounter by not using a vented gas cap? You would think the fuel pump would cause a vacuum on the tank..........but mine builds pressure.

 

If a tank isn't vented somehow, it will vapor lock.

 

LOL! Maybe thats why I have so much air bubbles in my fuel filter. But you would think it would force feed the fuel and as long as the pickup tube stayed submerged.........how would it get air/vapors in the line?

 

You will get vapor/bubbles from the fuel actually boiling. It works just the opposite of your cooling system, where you pressurize your coolant to raise the boiling point. Take your fuel system, put it under vacuum, and you lower the boiling point (vapor point). Now run that fuel line that's under vacuum next to the hot exhaust, and you're going to have vapor lock. If you're running a mechanical fuel pump, it may even happen more often.

Hope this helps.

 

Every bit of info helps........I have checked the fuel line.....its not getting hot. The closest hot spot is where the fuel line is 2.5" away from one of the headers. I can reach down and grab it and it is slightly warm. I am going to wrap it anyway. No other part of the fuel line is remotely close to the exhause. Fuel line runs down the frame line and the exhaust is just on either side of the drive shaft. At least a 1' or better from the exhaust.