Fuel consumption differential

[Crowbar]

1987 28 ft Voyager. Twin 230 hp gas. 1580 hrs. My port engine burns between 1/2 and 3/4 gal./hr more than stb. engine. Is this excessive or sort of normal?

[throwback2]

I have same boat and power.Both engines burn about the same. There's a lot of things that could cause this. Props could be a little different or slightly damaged,dirty flame arrestors,tune up needed,to name a few.

[km1125]

Check your chokes and make sure they are completely opening when the engine is warm. I had the choke thermostat go bad on my stbd engine and it would stay 1/2 way closed when the engine was warm. Still ran good, but used noticeably more fuel.

[bud37]

Could I ask, how are you measuring this fuel use ?

[Crowbar]

Thanks for the tips. I'm measuring when I fill the tanks. Typically, the stb will take 30 gal and the port will take 38-40gal

[amanphoto]

Check your propeller shaft drag. Do both propeller shafts have the same resistance when you manually turn them by hand (transmissions in neutral)?

[tomschauer]

if they are both tuned well, and your running gear is in good shape, it could be as simple as a sync problem. You would be surprised wahy a couple hundred RPM's will do.
If you don't have a sync, try pushing the starboard up a couple hundred rpm as read on the tach and see if it balances out.