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#1
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I agree that you do have to get the EGT gauge fixed to properly lean per the POH, but if you are coming close to leaning both engines per the POH* , my main concern is that the 3 gallon per hour difference may be a problem far worse than unbalanced leaning. You might have a tank leak or, even worse, a leak elsewhere in the fuel system. I would have this looked at ASAP.
Ernie ___________________ * Coming close is doable even without an EGT gauge by an experienced pilot, familiar with both engines, using the standard fuel flow gauges, relying on the roughness that accompanies peak EGT, and then enriching from peak EGT by the same flow rate needed to enrich the other engine after its peak EGT. 
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#2
12-17-10, 11:13 AM
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Remember, the fuel flow indicator is based on pressure not flow. Without the EGT to verify the setting, there may be a pressure issue.
__________________
Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#3
12-19-10, 03:39 PM
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Scotty,
Did your fuel flow indicate the same value for both engines? I agree with Gord that the mixture lever position is not the best indicatoin of fuel flow. The way I run the engines I would have burned just shy of 100 gallons in 5 hours and with 128 gallon tanks that only leaves about 15 gallons per engine. Yikes! Randy
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