I have a 2009 CT335 and as of late, randomly, the fuel bowl will empty on me, while the tractor is running, to the point that it will starve of fuel. The remedy is to turnt he fuel bowl valve to air, bleed the lines, turn off the tractor, set to on, and away we go again. This may happen every 5 minutes or once evey 5 days. Totally random. Does not matter if you are going uphill, downhill, on the level, under a load or idle. Mecahnical fuel pump is tested and strong, fuel tank is always at least 1/2 full, and the fuel is always fresh. I have tried to runn with the fuel cap cracked open to see if that is the cause, but to no avial. Any ideas on wha tto look for or to check? This is starting to be annoying, especially when I have to get things done, like get the hay in fromthe fields as the dark clouds gather onthe horizon, going down the road, etc. all opportune times for this to occur.