Long Range Second Fuel Tank?

[Umbre]

I want to expand my range like the old CTs with XR250 gas tanks. I know I can't route a second tank to reserve but is there any reason I couldn't splice one into the fuel line with a T connector? Would that mess with the fuel injection? I also think mounting a tank to the frame would be impractical but a tank on a rack like this guy should do the trick.

 

[dmonkey]

If you plan on having the second fuel tank permanently fixed to the bike, the easy route may be to just run a line from the bottom of the secondary tank to the top of the main tank (you might need a return line for air if you don't vent it), and then add an inline electric fuel pump to that line and an on/off switch for it. Main tank goes low, flip the switch to pump from the secondary tank into the main tank to refill it, toggle the switch to off when it nears full again.

The problem with a T connector is that the fuel pump is in the bottom of the main tank. So if you T that it'll likely just empty the main tank into the secondary tank unless you valve it. You also don't want to run the main tank's fuel pump when the tank is empty.

What type of riding do you have in mind? If you're not out to set any records, a detachable fuel bottle/jug/rotopax that you can stop and refill with might be the more practical solution.

 

[Umbre]

If you plan on having the second fuel tank permanently fixed to the bike, the easy route may be to just run a line from the bottom of the secondary tank to the top of the main tank (you might need a return line for air if you don't vent it), and then add an inline electric fuel pump to that line and an on/off switch for it. Main tank goes low, flip the switch to pump from the secondary tank into the main tank to refill it, toggle the switch to off when it nears full again.

The problem with a T connector is that the fuel pump is in the bottom of the main tank. So if you T that it'll likely just empty the main tank into the secondary tank unless you valve it. You also don't want to run the main tank's fuel pump when the tank is empty.

What type of riding do you have in mind? If you're not out to set any records, a detachable fuel bottle/jug/rotopax that you can stop and refill with might be the more practical solution.

I ride at night almost exclusively because of work and fuel is hard to find. I keep having to turn back early from running low on gas. I think I'm gonna start with a fuel bottle but I think you might be onto something. I'm gonna keep an eye out for some parts. Thanks for the advice!

 

[m in sc]

fuel cell on back 1 or 2 gallon. they are vented and have outlet lines. run a line out of it to near the filler neck. yes, use a valve. when it gets low pull over put line in filler, turn valve on and refill. easiest way IMHO. .02

 

[BaldRider]

Strapping 4 gallons of gas in cans on the rack worked for me. Stopping every hundred miles or so gave me an opportunity to stretch, too. I opted not to plumb in a tank but I would have tapped into the tank directly if I had.

 

[Chinjab]

I put one of these onto my WR250 from camel-adv.com

Honda CRF300L Camel Tank

Honda CRF300L Camel Tank Easy to install, convenient, and factory-looking fit. Occupying the unused space between the rear tire and the pannier rack, the Camel Tank keeps the fuel weight low, balances out the weight of your exhaust systems on the opposite side, and leaves your rear rack free for...

camel-adv.com

Essentially functioned as mentioned, but used a fuel line running to the fuel cap on the bike. Fill up both tanks, and it would drain the aux tank first.

The fuel line to filler cap wouldn't work for the CT tho, as the cap is under the seat... just an idea tho

 

[Umbre]

I put one of these onto my WR250 from camel-adv.com

Honda CRF300L Camel Tank

Honda CRF300L Camel Tank Easy to install, convenient, and factory-looking fit. Occupying the unused space between the rear tire and the pannier rack, the Camel Tank keeps the fuel weight low, balances out the weight of your exhaust systems on the opposite side, and leaves your rear rack free for...

camel-adv.com

Essentially functioned as mentioned, but used a fuel line running to the fuel cap on the bike. Fill up both tanks, and it would drain the aux tank first.

The fuel line to filler cap wouldn't work for the CT tho, as the cap is under the seat... just an idea tho

you might be on to something I might have to think about making this work

 

[Chinjab]

It was a really slick and simple system - no fuel pump, no mods to the existing fuel system or tank just a new fuel cap with a nipple sticking out of it.

I imagine if you soldered a nipple near the top of the CT tank, ran a fuel line to the bottom of a secondary tank, and installed a vent hose on the top of the secondary tank... it should work just fine.

 

[Umbre]

Does anyone know where the air vent for the fuel tank is?

 

[Umbre]

I put one of these onto my WR250 from camel-adv.com

Honda CRF300L Camel Tank

Honda CRF300L Camel Tank Easy to install, convenient, and factory-looking fit. Occupying the unused space between the rear tire and the pannier rack, the Camel Tank keeps the fuel weight low, balances out the weight of your exhaust systems on the opposite side, and leaves your rear rack free for...

camel-adv.com

Essentially functioned as mentioned, but used a fuel line running to the fuel cap on the bike. Fill up both tanks, and it would drain the aux tank first.

The fuel line to filler cap wouldn't work for the CT tho, as the cap is under the seat... just an idea tho

I started looking and the air vent is tucked under the seat off to the side. I think I might be able to run an acerbis front auxiliary tank mounted to a center rack. There's enough of a gap with a diabolus seat for my fingers so a fuel line should fit under it.

This Might Work.

 

[dmonkey]

Does anyone know where the air vent for the fuel tank is?

It vents through the line that comes out right on the side of the filler neck, and that runs to the EVAP canister, which is typically a charcoal filter in a plastic cylinder that helps prevent fuel vapors from escaping the tank. When I had the exhaust and right side plastics off the bike, I found those items to be somewhat accessible while not having pulled the fuel tank.