Vulcan-Hart GHF90G Service Manual page 15

SYMPTOM
4. Leaking tank.
5. Pilot burner flames adjusted properly, but
fluctuate to very low and blow out easily.
TROUBLESHOOTING
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POSSIBLE CAUSE
A. Foam-over by depleted shortening permits
oil to drip from the tank surface, giving the
appearance of leaking.
B. Careless draining procedures. Gas valve
should be in the PILOT or OFF position
before draining oil. Burners heating an empty
tank will damage tank joints.
C. Carbon buildup causes rapid attack on tank
by promoting acid formulation.
A. Check gas pressure at submanifold fitting on
fryer when fryer is in operation. Check all
other equipment on the same gas line in
operation.
B. Pressure at submanifold (pipe on which
burners are mounted) should not be less than
4.0" W.C. (natural and mixed gas) or 10"
W.C. for propane gas.