I have looked over troubleshooting pages all morning and now have to ask for help. We Wayne oil burner model moc-80 this summer I install a new oil tank outside, all was checked over and tested working perfectly for the past 2 and a half months. The past few days I noticed the burner thumping a bit as if it were going out and kicking in finally 4am it kicked off 3 degrees out side I thought it froze so I used a heat gun to thaw it, still skipping bleed the lines and it looked bubbly got a solid stream and it worked for 5 minutes and started again. It stays working now it is a bit warmer for an hour or so then spurts and spits again I can actually smell kerosene when it does this. Any suggestions welcome thanks in advance.