Twin 5.7L carbed. Starboard engine fuel usage significantly more than port

[airdvr1227]

I've always noticed a bit but it struck me this morning on the way back from Put-in-Bay. Two weeks ago I filled both tanks (75 gal. each) Today the starboard tank is between 1/4 and 1/8th tank. Port is at 1/2.

Where do I begin to look?

 

[GA_Boater]

Stating off simple, could be the tank senders. Maybe fill both tanks again and see what it takes to fill them.

 

[achris]

Do you have an engine 'Sync' gauge? If not, get one. You may be running the stbd engine with a tad more throttle open. At higher RPM you would not notice it on the tacho....

 

[airdvr1227]

In an attempt to find a running problem last season we removed the sync. Could being out of sync by a few hundred RPM cause that much difference in fuel burn?

 

[achris]

Absolutely. A couple of hundred revs means considerably more throttle, that means fuel. BTW, dash tachos are not accurate enough to run twin engines. They can easily be a few hundred revs out. I have the gear to check tachos, and my friends' tacho reads 900rpm when the engine is actually doing 650rpm....

Chris..........

 

[airdvr1227]

Gauge is still in the dash. Is it difficult to re-install?