[C320-list] Yanmar 3Gm30 typical fuel consumption?

[Graeme Clark]

Final follow up on this. Having been unable to fuel the boat on our return we did so today (next time back on board) and I found my fuel consumption to average at 0.8 gal per hour for 14 hours motoring into a headwind in a moderate sea. This is about double my normal average which largely comprises motoring onto and off the dock or mooring and fifteen to twenty minutes at about 1500rpm whilst we get everything stowed and sails raised befor shutting down the engine. 

Hopefully useful for someone else. It does seem a bit higher than the Westerbeke on my previous C320

Graeme
#366, 1996, England

Sent from mobile: please excuse typos etc.!


> On 5 Jun 2016, at 14:29, Graeme Clark <cg at skyflyer.co.uk> wrote:
> 
> Jim
> I'm not sure such a thing exists! Working  - yes, but accurate?  
> Ideally fitting a sight tube would be the most accurate - although inconvenient - way to determine fuel level
> I think gauges as fitted as standard to 320s and other boats are pretty rough and ready and are often not linear
> 
> 
> The PO of my boat told me that the sender was replaced with an incorrect model and that the gauge does work but only comes off the FULL mark when the tank is about half empty
> By my reckoning it must be more than half empty now but I'm reluctant to keep going and find out the hard way that it never comes away from full!
> 
> Time to buy and fit a new sender unit!
> At least I now know how to get the floor out that sits above the fuel tank to enable access!
> Graeme
> #366 
> 
> Sent from mobile: please excuse typos etc.!
> 
> 
>> On 5 Jun 2016, at 14:02, jbrown5093 at yahoo.com wrote:
>> 
>> Guess that's why it would be nice to have a working, accurate fuel gauge which at the moment I don't have.
>> Jim Brown
>> 
>> Sent from my iPad
>> 
>>> On Jun 5, 2016, at 8:53 AM, John Meyers <jcmeyers7 at gmail.com> wrote:
>>> 
>>> I am so sorry/dyslexic. I meant to write that I get 2.2 hours per gallon.
>>> 
>>> John Meyers
>>> 
>>>> On Sun, Jun 5, 2016 at 8:47 AM, Graeme Clark <cg at skyflyer.co.uk> wrote:
>>>> 
>>>> Now I'm confused! Some people saying 0.75 and others 2.2 gal per hour!
>>>> My typical average is under 0.5 but that includes a lot of gentle
>>>> pottering so probably more when sustained high rom, obviously
>>>> 0.75 sounds sensible. 2.2 sounds mad!
>>>> Graeme
>>>> 
>>>> Sent from mobile: please excuse typos etc.!
>>>> 
>>>> 
>>>>> On 5 Jun 2016, at 11:39, John Meyers <jcmeyers7 at gmail.com> wrote:
>>>>> 
>>>>> On my 1997 3GM30 last year I got 2.2 gallons per hour for the 23 gallons
>>>>> that I use all year. That was a mix rpms  from 1500 to 3000. I do have a
>>>> 3
>>>>> big bladed feathering propeller that may have something to do with that.
>>>>> 
>>>>> John Meyers
>>>>> Muskegon MI
>>>>> Wind Chime #406
>>>>> 
>>>>>> On Sat, Jun 4, 2016 at 12:53 PM, John Frost <john at frostnet.net> wrote:
>>>>>> 
>>>>>> The spec for my 3YM30 (Note the Y) has a chart that says approximately
>>>>>> .3GPH @2000RPM
>>>>>> .4GPH at 2250RPM
>>>>>> .6GPH at 2500RPM
>>>>>> 1.1GPH at 3000RPM
>>>>>> 1.3GPH at 3250RPM
>>>>>> 1.7GPH at 3500RPM
>>>>>> 1.9GPH at 3650RPM
>>>>>> 
>>>>>>                                      +
>>>>>> Happy Sailing!          /||\
>>>>>> John                           / ||  \
>>>>>>                               /    ||    \
>>>>>>                             /      ||      \
>>>>>>                           /        ||        \
>>>>>>                         /          ||          \
>>>>>>                       /            ||            \
>>>>>>                     /              ||              \
>>>>>>                   /                ||                \
>>>>>>                 /                  ||                  \
>>>>>>               /                    || Hull 1118 \
>>>>>>             /                      ||                      \
>>>>>>           /                        ||                         \
>>>>>>         /     Catalina     ||                           \
>>>>>>       /     C320MKII    ||                             \
>>>>>>     /            2007         ||                                \
>>>>>>   /                                ||_____________\
>>>>>> /_____________||____
>>>>>> _________/__________\_____|__
>>>>>>  \              Lake Guntersville, AL                    l_
>>>>>>   \________________________________)
>>>>>>                               \       |
>>>>>> |  |
>>>>>>                                 \__|
>>>> |_|
>>>>>> -----Original Message-----
>>>>>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On
>>>>>> Behalf Of Karl Mielenhausen
>>>>>> Sent: Saturday, June 4, 2016 11:32 AM
>>>>>> To: C320IA Discussion List
>>>>>> Subject: Re: [C320-list] Yanmar 3Gm30 typical fuel consumption?
>>>>>> 
>>>>>> Yanmar literature states 0.3 gpm (actually 1.1 lpm) at 1800 rpm.
>>>>>> 
>>>>>> Karl
>>>>>> 
>>>>>>> On Sat, Jun 4, 2016 at 10:16 AM, Graeme Clark <cg at skyflyer.co.uk>
>>>> wrote:
>>>>>>> 
>>>>>>> Hi all. I have a broken fuel gauge and we have logged 30 hours since
>>>>>>> tank was last filled. The local fuel supplier has had a breakdown and
>>>>>>> I'm some considerable distance from next nearest, with light to calm
>>>>>> winds!
>>>>>>> Trying to assess my likely remaining fuel. Of that 30 hrs a large part
>>>>>>> has been sub 1500rpm just mooring up etc I'm thinking about 0.4 gal/hr
>>>>>>> maybe 0.5 to be conservative. I have a spare gallon can also!
>>>>>>> Anyone have a better guess?
>>>>>>> Thanks
>>>>>>> Graeme
>>>>>>> #366, currently in the Isles of Scilly!
>>>>>>> 
>>>>>>> 
>>>>>>> Sent from mobile: please excuse typos etc.!
>>