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Fuel consumption differential

The is the forum to discuss general information regarding all Carver Yachts.
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Crowbar
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Vessel Info: 1987 Carver Voyager- twin 305 gas
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Fuel consumption differential

Postby Crowbar » August 3rd, 2018, 2:45 pm

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?

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Re: Fuel consumption differential

Postby throwback2 » August 3rd, 2018, 4:41 pm

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.
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Re: Fuel consumption differential

Postby km1125 » August 4th, 2018, 11:29 am

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.
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Re: Fuel consumption differential

Postby bud37 » August 4th, 2018, 3:01 pm

Could I ask, how are you measuring this fuel use ?
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Topic author United States of America
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Scurvy Dog
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Vessel Info: 1987 Carver Voyager- twin 305 gas
Location: LaConner, WA

Re: Fuel consumption differential

Postby Crowbar » August 8th, 2018, 11:47 am

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
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Re: Fuel consumption differential

Postby amanphoto » August 8th, 2018, 12:50 pm

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

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Re: Fuel consumption differential

Postby tomschauer » August 21st, 2018, 7:28 pm

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.

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