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9.9 Honda Outboard Efficiency Question

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peterniew
Deckhand

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Canada
1 Posts

Initially Posted - 10/10/2010 : 10:12:21

Hi, I own a '04 9.9 Honda outboard motor on my '95 250 WB. I was wondering if any one else had such a set up, and if any of you had checked what the fuel consumption was like under average conditions. Hours? MPG? Miles? I only have a 3 gallon tank at the moment, but I plan to increase the capacity in the outside fuel compartment. Has anyone found a bigger tank that fits in that box or has anyone made a custom fuel cell? Any feedback and suggestions are appreciated.

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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts

Response Posted - 10/10/2010 : 12:03:43

FWIW, my Honda 8 (actually the same engine as yours) burned maybe .6 gallon per hour at 5 - 5.5 knots cruise (around half throttle), which is a little over 8 nmpg. That was on a C-25, so the tank accommodations were different. (Now I'm down to about 3.5 mpg.

)

Incidentally, it's best for mileage to not try to push her up to 6 knots. As you approach hull speed (about 6.3), the stern squats and you start drawing more wake, increasing drag and wasting power.

Edited by - Stinkpotter on 10/10/2010 12:12:54

OLarryR
Master Marine Consultant

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USA
3466 Posts

Response Posted - 10/10/2010 : 20:34:21

my experience with my 2006 Honda 9.9 is similar to Dave - About 8nmpg.

I have a 3 gallon tank that came with the outboard but I also bought a Honda 6 gallon tank and it also fits in my gas compartment....but that is the gas compartment on a '89 Cat 25, so I am not sure how that compartment compares with the Cat 250 gas compartment.

Edited by - OLarryR on 10/10/2010 20:37:05

TakeFive
Master Marine Consultant

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2272 Posts

Response Posted - 10/10/2010 : 20:47:16

I read a comment somewhere (here?) that the only 6 gal. plastic gas tank that fits in a C250 fuel locker was made by Tempo. Since then Tempo went out of business.

Take it with a grain of salt, because it's just what someone said. But I have an old Tempo 6 gallon tank in my basement that I may try sometime.

Edited by - TakeFive on 10/11/2010 19:33:22

delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts

Response Posted - 10/11/2010 : 21:27:00

It's pretty easy to find the older style 6 gallon metal tanks on Craigslist. I see them quite frequently and they fit in my '97 WK's fuel locker. If you're handy with fiberglass, I calculated a while back that you could make a roughly 12 gallon tank out of the locker.

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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts

Response Posted - 10/12/2010 : 06:52:55

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by delliottg
 It's pretty easy to find the older style 6 gallon metal tanks on Craigslist. I see them quite frequently and they fit in my '97 WK's fuel locker. If you're handy with fiberglass, I calculated a while back that you could make a roughly 12 gallon tank out of the locker.
<hr height="1" noshade id="quote"></blockquote id="quote">Be aware of the enormous problems owners of fiberglass gas tanks are now having with E-10 gasoline (and E-15 will be worse). The ethanol disolves or reacts with the resin and then gunks up fuel lines, carbs, injector pumps, injectors, and combustion chambers. Large boats with fiberglass tanks molded into the hulls have had to be totally re-powered and the tanks totally replaced--often requiring new decks, etc.

Metal tanks--steel or aluminum--are no longer a good option, either--ethanol corrodes them. Boat builders have all switched to plastic for built-in gasoline tanks.

Edited by - Stinkpotter on 10/12/2010 06:56:25

Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 10/12/2010 : 12:45:32

A standard three gallon tank will take you a long way. When we cruise we carry an extra three gallon tank and secure it by the swim ladder. If you need the extra tank simply disconnect the quick-release fitting, swap the tanks, and reconnect.

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zeil
Master Marine Consultant

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Canada
1314 Posts

Response Posted - 10/12/2010 : 20:09:07

A readily available 10 liter (2.2 imp.gal) upright gas container will fit snugly next to the standard Honda 13.64 liter (3 imp.gal) tank in the fuel compartment bringing the total available fuel to about 23.64 liter (5.2 imp. gal) or sufficient to continuously motor over 8 hours at about half throttle and using 2.73 liters (.6 imp. gal), discounting currents and wind conditions, may give you approx. 40nm.

To be sure we carry 2 additional 10 ltr containers on longer trips... you just never know!!

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sweetcraft
Admiral

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USA
816 Posts

Response Posted - 10/13/2010 : 10:04:40

Saw a stainless steel tank with guage at a marine store in Poulsbo, Wn. Has anyone tried it or seen it used? 6 gallon seemed taller than my Johnson 6 gallon.

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piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 10/13/2010 : 14:36:36

Jim, I have not but make sure you had a quick release fitting already mentioned by Randy. There is nothing worse than trying to pour gas when seas are unfriendly. Been there done that once and learned a lesson.
When I go for longer trips, 30+ miles, I take my 3 and 6 gal tanks. Plus 2 gal for dinghy. Longer isolated trips I add another 3 gal. I fill up at destination and always have lots left over upon return. Better safe and I dont want to call and wait for BoatUS.
Steve A

Edited by - piseas on 10/13/2010 14:39:07

Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 10/13/2010 : 19:15:44

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by piseas
 Jim, I have not but make sure you had a quick release fitting already mentioned by Randy. There is nothing worse than trying to pour gas when seas are unfriendly. Been there done that once and learned a lesson.
<hr height="1" noshade id="quote"></blockquote id="quote">

Been there done that too!

Heavy seas, strong winds, getting close to a rocky shore, running low on gas, trying to pour fuel into the tank.

That's why I carry two quick release tanks on cruises!!

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sweetcraft
Admiral

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USA
816 Posts

Response Posted - 10/13/2010 : 19:51:23

I also carry two tanks with quick connect fittings at the end of 40 inches or fire resistant fuel line. Got rid of the connections at the tanks so the possible drip is at the outboard. I use the one hour per gallon for safety planning of time for estimating fuel. The gauge is checked and if conditions warrant I switch to full tank, current and weather. The length of fuel line means I don't have to move tanks.

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cat25
Navigator

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USA
140 Posts

Response Posted - 10/28/2010 : 03:27:20

i use two three gallon tanks. they both fit into the fuel locker in the cockpit. its tight but they fit very nicely.

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