Dual fuel tank setup help

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Jarvy Oliva

Member
Joined
Oct 28, 2011
Messages
10
Newb trying to figure out how to properly connect the fuel lines between a Sullivan 12oz and a 4oz tank in my 1/8 scale hydro. Running ops 67. The 4oz is located by the carb and the 12oz is wedged next to the pipe (just past the midsection of the boat). Any advice will be greatly appreciated.
 
Thank you! That makes sense. Does the fuel line lengths or id's matter? Currently using the "medium" size id from Dubro with some addition line slack on both ends.
 
How far is the main tank from the hopper tank? That will have an effect on fuel draw...and not too much "slack line" make it as short as you can. Hope this helps...

Bob
 
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Use 5/32" brass on your tank's also will give a good fuel flow.
 
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The longer the lines the more pressure it needs to deliver the same volume than if the lines were shorter.

I would say since its a .67 go with what David said. You may however get away with 3/32" for you pressure line.

FYI ,Just enlarging the lines without doing the tank tubing doesn't work that well.
 
If you have two saddle tanks built do you install internal hoppers in both tanks?
Ray,

If you use two saddle tanks same size the needle will change when the one tank empties. Your engine will go rich as the fuel is more easily drawn to the engine. If you use a hopper tank and one large tank the whole idea is to keep the hopper tank full at all times. That is why the hopper is a smaller tank and the needle does not change on you. Using hoppers in two saddle tanks will not cure that problem. Move to Virginia and we will help you out.

John

John
 
If you have two saddle tanks built do you install internal hoppers in both tanks?
Ray,

If you use two saddle tanks same size the needle will change when the one tank empties. Your engine will go rich as the fuel is more easily drawn to the engine. If you use a hopper tank and one large tank the whole idea is to keep the hopper tank full at all times. That is why the hopper is a smaller tank and the needle does not change on you. Using hoppers in two saddle tanks will not cure that problem. Move to Virginia and we will help you out.

John

John
LMAO
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Thanks Professor.
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Ray,

If you use two saddle tanks same size the needle will change when the one tank empties. Your engine will go rich as the fuel is more easily drawn to the engine. If you use a hopper tank and one large tank the whole idea is to keep the hopper tank full at all times. That is why the hopper is a smaller tank and the needle does not change on you. Using hoppers in two saddle tanks will not cure that problem. Move to Virginia and we will help you out.

John

John


LMAO
default_laugh.png
Thanks Professor.
default_cool.png
SIMON SAYS< STAND ON YOUR HEAD FOR , 1o MINUTES< THEN LET ME KNOW HOW U FEEEEEEEEEELLLLLLLLLLL, PLEASE
 
where is the big tank located on right side hopefully as this will help with fuel flow when cornering as g force will want to make fuel go the left, if you have the tank on left it will be harder for the fuel to go from main to the header when cornering
 
Hi Joern,

I'm still pretty new to setting up a boat. With that said please explain how to setup and use a Float Chamber.

A picture or two would be a great help as well.

Thanks very much,

Lee
 
If I understand what he's talking about, you use a one or two ounce tank between your main fuel tank and the needle. The idea is to keep your fuel pressure consistent, minimizing the need to use a remote needle during your run.
 
A float chamber is a small tank that the carb draws fuel from. It is kept full by the pressurized main tank or tanks. The float chamber has a float and needle/seat to regulate the fuel level in the chamber. The chamber is not pressurized.
 
A float chamber is a small tank that the carb draws fuel from. It is kept full by the pressurized main tank or tanks. The float chamber has a float and needle/seat to regulate the fuel level in the chamber. The chamber is not pressurized.
That sounds like a description of a float bowl and float in a carburetor that is used in automotive or private aircraft applications
 
A float chamber is a small tank that the carb draws fuel from. It is kept full by the pressurized main tank or tanks. The float chamber has a float and needle/seat to regulate the fuel level in the chamber. The chamber is not pressurized.
That sounds like a description of a float bowl and float in a carburetor that is used in automotive or private aircraft applications
 
A float chamber is a small tank that the carb draws fuel from. It is kept full by the pressurized main tank or tanks. The float chamber has a float and needle/seat to regulate the fuel level in the chamber. The chamber is not pressurized.
That sounds like a description of a float bowl and float in a carburetor that is used in automotive or private aircraft applications
 
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