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H216Sailor 03-31-2008 10:51 PM

Yanmar 1GM Diesel fuel consumption
I am new to a 1983 Yanmar 1GM engine in a CAL 27 and have no prior experience with diesel engines.

I would like to get an estimate of the diesel fuel consumption (gallons/hr) at 2500 rpm. Any comments on this would be helpful.


JohnRPollard 04-01-2008 07:48 AM

The current version of that engine uses about 0.2 gph at 2500rpm. That's probably in the ballpark for your version too.

petegingras 04-01-2008 07:58 AM


we're gonna need a little meat on this bone, are you moving the boat, on a limited tank, or just saving fuel?

H216Sailor 04-01-2008 03:04 PM

Yanmar 1GM Diesel Fuel Consumption

In response to your questions, I'm not moving the boat in the sense of from one harbor to another and, while I'm always interested in saving fuel, the question is not related to fuel inventory on a trip.

Being new to diesel engines, I'm just trying to get some idea how much fuel I will burn during this season of boating while motoring out to sail and return, maybe motoring 3 to 4 hours each time. While I know the tank is full, I'm not sure the fuel gauge is accurate. And, depending on how fuel is burned, It may be necessary to pump fuel out the tank at the end of the season to avoid fuel problems.

Thanks for your interest.

petegingras 04-01-2008 03:15 PM


Thanks for your interest
Not an affront, just being inquisitive on a rainy day. Fuel polishing is recommended every few years with larger tanks, but Racor filters seem to work fine for me, and frequent bleeding of the fuel lines, including injectors is good practice.

I’m on my third Yanmar, in third boat, and am pleased with their performance.

If you get a chance some tech schools teach weekend seminars on practical diesel engine troubleshooting.

good luck

DrB 04-01-2008 03:24 PM

Pump out at End of Season?
I was told to keep the fuel topped off before putting decommissioning the boat for the winter. I also add a small amount of fuel additive to minimize bug growth. The only time to pump your tank is if you have a junk in it (I have been told). Use clean fuel and this shouldn't be much of an issue.

My tank holds 20 gallons. I fill it up before the end of the season. In the spring when I relaunch, I use until it reaches half full and then refill over 2X with 5 gallon each. I get my diesel from a truck stop that has a lot of traffic so I know the fuel is turned over frequently. I don't separate the fuel from water before I put it in the boat. My assumption is if it has that much water in it, trucks can't use it also and there would be an corrective action at the particular fuel stop I use. I do have a water separator/fuel filter in-line before the engine.


H216Sailor 04-01-2008 09:20 PM

Pump out at end of season

Thanks for the advice.

In my case, I think with a 12 gallon tank we may have an excess of fuel in the tank at the end of the season and at least some of it may be 1.5 to 2 years old.

I had considered just having something like 6 gallons in the tank and depend on a fuel/water separator to handle any moisture that might accumulate but I'm not sure that is the right way to go about managing the fuel inventory either.

B32 04-01-2008 09:36 PM

Yanmar 1GM Fuel Consumption
We have a Bayfield 25 with a 1GM Yanmar.
We seem to average about 1L/hr on the motor at 2700 to 3000 RPM.
We don't have a fuel gauge. We dip the tank regularly.
We figure we can do a work week (in a manner of speaking) on one tank (40L).

Hope this helps a little.

SVDistantStar 04-01-2008 11:08 PM

B32, how big is your fuel tank? Ive also got a bayfield 25 and dont know the tank size. It looks to be the stock tank in the bilge. You run your motor about the same speeds i run mine. I knew it hardly used any fuel.

H216Sailor 04-02-2008 11:01 PM

Thanks for your interest

No afront taken, espeically on a rainy day for you. In my novice state, it would be helpful if you could define what "polishing diesel fuel" involves.

Thanks again,
H216 Sailor

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