Join Date: Feb 2007
Location: New Orleans, LA
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Rep Power: 10
If it is the fuel vent and you have cleaned it out, be sure that you have replaced the 30 mesh screen for it. This screen will prevent flames from entering the vent line (#1 priority) and keep out the vermin (#2 priority).
And on your water tank vents use 16 mesh screen to keep out the vermin a #1 priority on this tank.
Also that the vent is of the same size (or Larger) as the fill line and isn't crimp/kinked anywhere along the vent line.