Pretty sure it's starving for fuel. First start of the day it will run beautifully for 5 minutes and shut off. Have to wait a minute or two to start it again, will run then for only about a minute and shut off again. Took a stab in the dark and replaced the fuel lock today. No luck. Even tried a different propane tank. Took the 5/8 rubber hose off between the regulator and the mixer - had a black gummy substance coating part of the inside of the hose, hose was soft and had a kink. Replaced it with a new hose, but still have the same problem. I did pull the vacuum hose off that goes to the filter lock when it was running and there wasn't much vacuum at all. Any suggestions what to try next? I'm pulling out what little hair I have left!