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Talisman
Last seen: 1 day 21 hours ago
Joined: 12/26/07
Posts: 226
Fuel Consumption

All of the sudden in July my fuel consumption on my 35B engine climbed to between 0.8 and 0.89 gal./hr.  In 15 years I've owned Talisman it has been consistent between 0.6 and 0.64.  This is measured by actual gallons replaced and engine hours on instruments.  No other change in behavior noticed and no change in use patterns.  Engine starts immediately and runs as beautifully as always.  No fuel leaks in bilge or diesel smell in the boat.  No change in exhaust fumes.  Boat is out of the water now and bottom was pretty clean.  Even though the numbers are low I'm concerned about the engine itself it has 2100 hours on it.  I would assume if injectors, valves, etc. in the engine had problems I would notice loss of power, noise, starting problems, vibration or some other sign not just increased fuel consumption.  This is about a ⅓ increase in consumption or about a quart per hour.

it has been suggested my hours counter on my tachometer is off effecting my calculation.  Has that happened to anyone?  Can it be fixed?  If the counter fails I would think it would just stop working not just slow down.

Enrique
Talisman
1998 36 MK2 Hull #1673
Tall Rig Wing Keel
M35BC engine
Old Saybrook, CT Summer
South Glastonbury, CT Winter
 

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Enrique
Talisman
1998 36 MK2 Hull #1673
Tall Rig Wing Keel
M35BC engine
Old Saybrook, CT Summer
South Glastonbury, CT Winter
 
Chachere's picture
Chachere
Last seen: 9 hours 46 min ago
Joined: 10/27/10
Posts: 605

Just a thought on one of your theories:  The hour meter (at least on our boat) essentially is just an electic clock: it counts when it is supplied with 12v (regardless of what the engine is actually doing, i.e., it will count time even if the engine isn't running but the power to it is on).
Could it be that the hour meter on your boat is getting an intermittant supply of power (i.e., a loose connection), such that its now undercounting? 

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Matthew Chachère
s/v ¡Que Chévere! #466
1985 C36 MKI tall rig fin keel M25
Homeported in eastern Long Island, NY

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