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Extended Range Gas Tank Mod

29K views 74 replies 32 participants last post by  Thorn  
#1 ·
This is a really easy and inexpensive mod. Hopefully the pics worked out.
I bought all of the parts at Wal-Mart for a total cost of about $65

Parts list:
6 Gal boat gas can
6’ Gas Hose
2 Gas Fittings
Zip ties
Loctite (See Pic)
Epoxy

Optional:
New Polaris Gas Cap
Lock & Ride Cargo Box
Strap rack for cargo box

I drilled a ½” hole in the gas cap with a spade bit.
Then just screw the gas fitting in to the cap, apply a little epoxy to the threads after nyou have started the fitting into the cap.
Apply the loctite to the threads sticking out from the bottom of the cap and thread on a piece of rubber tubing.

Mount the gas tank to the bed of your RZR.
Route the hose from the tank behind the passenger seat to the gas cap.

And your done.

I have not road tested this yet but what I will do is run the main tank down to about ½. With the hose in place you need to open the vent on the gas can and pump the bulb a few times to get the fuel to flow. The fuel flow rate is 1 gallon every 6 minutes.

Let me know what you think and add any ways to improve the design.
 

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#5 ·
It looks good. I see one potential problem.
You have created a siphon fill tank. That has been used for years. I have set up several in the past (they are no longer legal on street vehicles here in California) Anyway back to you. The vent for the RZR fuel tank is in a square tube under the bed just behind the drivers seat. LOWER than your new tank. So fuel will siphon from the add on tank to the RZR tank and possible out the vent.
You just need to raise the RZR tank vent hose above your new tank. I would go 6 to 12" higher.
 
#14 ·
might need something similar since my duals,ump,fuel controller and cluthc kit was put on,the ol fuel milage aint what she use to be,but i new that going in.:lol:
 
#16 ·
Tom, Be wicked careful here. I can see the vent leaking too from the pressure of the large higher tank. What about those fumes and such building up in the area behind the engine. Great thought and design, but it sounds to me like it's not worth finding out if it works or not. What if you strapped into the machine and something goes wrong. I don't like it.....Not worth the potential disaster. Get some Rotopax and fill the tank manually.
 
#22 ·
My thoughts also. 7 gallons lasts a long time in a RZR. Just stop and use a can to refill. The more gas lines, tanks, ect you add the more you increase the risk of a fire. :scared2: With the motor and tanks behind you a fire can VERY easily be deadly. By the time you know there is a problem its to late.. Its a neat idea and I'm not knocking it.. I just think its a dangerous setup for off roading..
 
#23 ·
The setup I have, I use a Flo&Go to refill right from the cans mounted in the bed, rather than lifting muddy dusty cans over my gas tank fill neck... I can also fuel up others the same way..

The can is a good idea as far as volume of fuel you can carry.... but, maybe a shutoff valve inline might be in order... and just open the vent to the aux.can when needed, not have it connected to the tank.. One little stick can empty a tank when you need the extra gas the most..
I know a guy who worked on a similar system for Quads, he carries the tank on his front rack all the time, and carries 5 gallon... the vent and fuel delivery were tricky to control... but he has a shutoff in the delivery line so it just trickles into his regular tank...
 
#25 ·
I am not sure what is scary? It is the same tank, hose, and hose fittings that you would use on an outboard motor. The only difference is one fitting is in my gas cap and not connected to the outboard motor.

It is not so much to save any time. It is just that the 6 gal boat tank is is heavy duty, and fits perfect on top of the lock and ride cargo box and has a nice tight cap. The down side is you can’t pore directly from the boat tank. I have had other cans split open on the trail and the pore spout seem to always leak.

I just assume that every one is familiar with the marine fuel system, but it is a tight closed system. Some people have mentioned a shut off valve, if you disconnect the hose from a fitting it is shut off. This type of fuel system has been in use as long as I have been boating and that is over 45 years.

So again what is scary? How is this 6 gal can any different than two 3gal cans on each side of the lock and ride cargo box?
 
#28 ·
I know you have already read a lot of this but I have to agree with Johnny and 8 ball don't mess with gas. It will ruin your day and your life. Buy factory made gas stuff they spend a lot of money on finding out why and why not gas tanks will work. I am not being nasty or negative but give it a lot of thought before you mess with gas.
 
#29 ·
In a boat it sits on the floor in front of the engine, in your rzr it's right above the heat source. The stock tank is bad enough just ahead of the exhaust pipe, there's been a couple of fires already. Maybe a smaller tank mounted in the front, under the hood using a similar set up?? Me, I'd just manually refill on a piss stop.
 
#33 ·
Well, I'm just naturally paranoid. I used to design control systems for oil rig blow out preventers (no.... not Cameron! Hydril). Anyway, a fuel line hanging out in the open both right behind a belted in passenger, as well as a hose sticking out right by the gas cap and their right hip just has me spooked. You'll probably never have a problem, but any stick that grabs that exposed line could rip it out and could dose you, your passenger, and the exhaust in a fraction of a second.

I'm also a little nervous about externally carried tanks, but a branch scraping along side of the RZR is unlikely to puncture it. (Could happen though!)
 
#34 ·
If memory serves, the line from that boat tank should shut off once it is un plugged. If not you can change it to that style.

Also the most common place i see tanks of this nature are in demo cars. I there there are a lot of girl scouts on this forum afraid of a plastic tank with a hose that can easily be shut off.

Either way, i like it. I am going to look into it, but I will be going with out the fill line, I would rather have a larger diameter tube that will fill the tank in the amount of time it takes me for a pee break.
 
#35 ·
Thats my thing also. Doesn't look like its duct tape and bubbled gummed setup or anything. Its just the extra lines out in the open and tank going behind the riders would scare me.. Probably won't have issues, I'd just worry about leaks over the motor. But I also don't have a huge need for a set up like that. So I'm less motivated. I carry a 2.5 gallon can on the drivers side of the bed. The nozzel of the can is inside so it stays clean. Most of the time between that and the stock tank I have more then enough for a days ride. If we do go out on a night ride we pretty much always go back to camp first to eat and refuel..
Like others said just be careful and keep an eye on it.
 
#38 ·
Well I'm going to go eat some thin mints and sell some lemonade... Then get it a strangers van just to prove I can throw caution to the wind also :shhh:
 
#39 ·
just a question here

Why?

If I understand correctly, you are doing the Trails Across America thing right?
and you have a fuel stop that is 150ish (130?) miles apart

Is everyone going with this set up?
Why do you need to fuel on the fly?

Its not a race right?
Its more of a ride

It don't take me very long to fill up with my gas can, and if everyone isn't going to fuel on the fly, why do you need to?

sorry I'm just trying to wrap my head around the whats and why's
 
#41 ·
I had an 8 gallon fuel cell in the back of my RZR and didn't like the rear end weight. I decided to build my own fuel tank where the stock tank was. I could only use about 5.5 gallons from my stock tank if memory serves me correctly. This new tank with I have made with a quick fill and roll over valve is 7.65 gallons which is about what I had in the 8 gallon. I will need the fuel with my Apex conversion that I am doing. This is a bitty to build for anyone attempting it. I am using an automotive electric fuel pump and the Apex fuel tank sending unit for fuel level. It could be made to fill in the stock location too. It has baffling inside to keep the fuel from running away from the pickup upon braking.
 

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#49 ·
Has any one taken a look at where their OEM fuel line comes from under the passanger seat back to the engine.
It passes within 4" to 5" of the header pipe with no heat sheild.
Talk about scary.
One person said he would not put his kid in a rig with my setup yet he will strap him in right on top of the tank that has the fuel line that close to the red hot header.:scared2:
 

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#50 ·
Has any one taken a look at where their OEM fuel line comes from under the passenger seat back to the engine.
It passes within 4" to 5" of the header pipe with no heat shield.
Talk about scary.
One person said he would not put his kid in a rig with my setup yet he will strap him in right on top of the tank that has the fuel line that close to the red hot header.:scared2:
Where I come from that is known as attempted homicide.

:popcorn: