Fuel Consumption

Bryant · Jul 10, 2016

I have a 1984 GB 36 Classic with a Ford Lehman 120. It's "new" to me and I've had a fuel line leak into the bilge so it's difficult to determine what I'm burning. What are other people with a similar motor seeing as a fuel consumption rate?

menzies · Jul 10, 2016

Why not just wait until you have run her some more and see what you get.

Every boat is different.

RT Firefly · Jul 10, 2016

Greetings,
Mr. B. Welcome aboard. I think you can expect in the neighborhood of 1.75 GPH to 2+a bit GPH depending on RPM. 1750 (the "sweet spot" for Lehmans) should yield around the 2 GPH mark.

Bryant · Jul 10, 2016

Yes, I'm planning to do that but I'd like to know what other people are seeing to use as a basis for comparisson.

tadhana · Jul 10, 2016

We have a Helmsman 38. Fully electronic engine, 230 hp cummins, so we get the GPH reported digitally at every speed. We find at 7 kt we burn 2.3-2.5 GPH

Nomad Willy · Jul 10, 2016

Bryant,
You've got a good boat for minimizing fuel burn relative to boat size in a SD design. Most GB 36's are twins w a total of 760 cu in displacement.

A 50% load is 3gph.

jleonard · Jul 11, 2016

Bryant said:
I have a 1984 GB 36 Classic with a Ford Lehman 120. It's "new" to me and I've had a fuel line leak into the bilge so it's difficult to determine what I'm burning. What are other people with a similar motor seeing as a fuel consumption rate?

I have a 40 Albin with a single Lehman. I burn about 1.75 gal per hour at around 1700/1750 rpm. Like RT said you should be in that range.

psneeld · Jul 11, 2016

Like Jay, slightly bigger prop.....burn near 2 gph up around 1650 rpm.

Pushes my boat with a 34 foot lwl about 6.3 knots average still water speed.

Averaged over my last 10,000 miles.....1.9 gph at 6.3 knots for 3.3 nmpg.

bayview · Jul 11, 2016

depends first on how fast you go.
I don't see how you could possibly run the boat if the fuel was leaking in sufficient quantity to affect mileage. What you get now is what you will get later.

Fuel Consumption

Bryant

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menzies

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RT Firefly

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Bryant

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tadhana

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Nomad Willy

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jleonard

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psneeld

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