boat fuel tank range
 

Okay guys I am kinda confuse my boat have 2 115 Yamaha 4 stroke with 2 80 gallon tanks.
Is the range of my boat 80 gallon or 160?

you have 160 gallons of gas. Range depends on GPH/MPG your motors burn. For example, I have a 79 gallon tank and get on average 3 MPG, so my range is roughly 240 miles. Different sea conditions mean more or less fuel burn, also take into consideration trolling and motors running at idle while you are drifting/tied up. Use the rule of 1/3s, 1/3 to get there, 1/3 to get back, and 1/3 for when the stuff hits the fan.

So both engine share the same tank or each have they own?

Always take into consideration the seas.

Our boat burns twice as much fuel in rough seas than it does in calm seas.

2 80 gallon tanks

You have an 80 gal range because each motor basically has 80 gal to run on.

Depending how you run it you should be getting at least 3 miles per gallon. You should be good to run and fish all day with what you have. Never leave the dock without a full tank. In your case that means 160 gallons. As you learn your boat you will be able to figure out just what you can do.

Okay, thanks great good of guys!

Deduct about 10 percent total fuel. Those big tanks don't fill all the way.

If you run bot dem motors and they got da same compression on all dem cylinders den you Gunna get da same fule us sage from bot motors .so if you got 2 of dem 80 gal tanks den u got a 80 galon ranged .now I dun know what range u gat from dat but I get an ideal you can go for a good way out to da islands of iron. Now what I would do is run on one of dem tanks till it emptied .then don't jack around and head to da house. You can do da 10% deal or figure da gasses per miles and all dat sifering stuff but you can't go wrong heading to da house when on 80 run out. So if you troll. For da fish it's one thing but if u set a rock on da bottom an fish lak dat it's another. I would split da two on one tank den run to da house on da other. An don't stop cuz u see a floater an jack around wit dat too u wasteing da fool you need to see mama.

Good luck wit da gas . I run out all da time wit one tank. But I keep one udder one jus in case. It's da five gallan kine and it get me to da house most of da time but I carry another one for da in case I see a floater. Sometime day need da gases mor than me.;)

they will both share the same tank but the fuel lines may be run direct to both tanks without a switch valve or in most cases each tanks fuel line will end at a fuel switch line and you turn it to the tank you want to use. you have to check and see how your fuel lines are run.

most often both engines will share one tank and you will have a valve to switch over to the second tank, but sometimes they are connected together in order to draw from both tanks and allow them to equalize so the weight load is balanced in large gas tanks mounted on the sides of the boat rather then the floor.

a switch valve for selecting which tank to use can be used as a safety because if one tank runs out you know you "should" have just enough gas to go straight back to the launch or fuel station. it is also handy if you get bad gas, a clogged fuel line or tank pickup in one tank, you can switch to the other.

what we used to do was run one tank this trip and then the other tank on the next trip so you always run the tanks dry alternatively and are sure there is no stale gas in a tank if you always save the same tank to use for the trip home.

if your tanks aren't mounted in the sides of the boat and you want the option to select the tank to use then in most cases it is easy enough to run new fuel lines direct to a switch valve near the transom in an out of the way but easily accessible location. but if you are interested in separating the tanks just be sure there isn't a separate crossover line used to equalize the tanks.

If you havent already, I'd would contact the guy you bought the boat from and he can answer you fuel questions on how it works

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Most catamarans do not share the tanks. Each motor pulls from its own tank on its own side. Unlike a V bottom they are in each pontoon. That way you always have a balanced ride. I have had three cats and all were that way.

Dog here did knot know we were talking about cats.
Oooops.

The rule is to calculate 90% of the total fuel carried and only count on that to be available. In your case you carry 160 gallons but the usable fuel is only 144 gallons(90% of 160) The main reason for using the 90% rule is that your tank pickup tubes don't go all the way to the bottom of the fuel tanks to avoid picking up sludge and water that accumulates there. If I were you I would install a fuel flow meter. Depending on the year model of your motors and the type of chartplotter you have it's an easy thing to do. Barring the above you can install a "flow Scan" for both motors or the old tried and true method of filling the tanks and taking the boat out for a normal day of fishing and then go back to the fuel dock and refill the tanks to get a real world idea of fuel burn.