Aux fuel tank
- Thread starter Atrox Caeda
- Start date
Doc2012
Senior Member
Not too sure. Remember talking to this guy at a meet up we had a couple years ago, and he said he used the Camry tank.
http://www.toyota-4runner.org/3rd-gen-t4rs/62114-camry-fuel-tank.html
http://www.toyota-4runner.org/3rd-gen-t4rs/62114-camry-fuel-tank.html
Singtoe
New member
I believe that this mod will be easy to do.
A: Get a F150 fuel tank and mount it where the spare tire fits.
B: Plum the fill tube in the rear tire well or make an access port in the cargo area.
C: Use the oe Ford pump and wire a switch that cycles a pair of double throw relays that will throw power from the toyota tank to the ford tank.
D: Graft in a toyota sending unit the in place of the ford and use relay to have the fuel gauge switch signals when the secondary tank is used.
E: Lastly, will need to buy a switching valve to divert the fuel return back to its appropriate tank when in operation.
Easy Peezy.
This will be my next mod that i do after my 100k service...
A: Get a F150 fuel tank and mount it where the spare tire fits.
B: Plum the fill tube in the rear tire well or make an access port in the cargo area.
C: Use the oe Ford pump and wire a switch that cycles a pair of double throw relays that will throw power from the toyota tank to the ford tank.
D: Graft in a toyota sending unit the in place of the ford and use relay to have the fuel gauge switch signals when the secondary tank is used.
E: Lastly, will need to buy a switching valve to divert the fuel return back to its appropriate tank when in operation.
Easy Peezy.
This will be my next mod that i do after my 100k service...
Dirtyfingers
Senior Member
I guarantee that anyone for any amount of money would fabricate anything for any given amount of money....money.
geohil
New member
Money and time are two things I'm stingy on. I'm amazed at how much of both we spend on our T4R's.
Dirtyfingers
Senior Member
That's the truth. I just don't really notice the time spent more than the money I've spent. I think that's why I don't have any girlfriends or anything of that matter. I'd rather spend it with my special T4R.
Doc2012
Senior Member
You guys SUCK.
Really got me thinking on this now.
Here's my issue. I want a flat belly. And longer range, WITHOUT having to take my 2 Jerrycans to the gas station every other day.
I've already got the motor and trans lifted, but lifting the tank is a PITA. It's not like a Taco where you can just take the bed off and cut a couple brackets and weld them higher. Our bodies don't allow us to do that.
When I first started my gas tank build, I was stoked. I wanted nothing more than to be able to finish this tank, and make it work.
Then, I remembered Rob saying he put a Camry tank in the back of his.
This got me thinking even more.
UMMMMMMMMM, why not mod the exsisting tank, and ADD the camry tank to the back, and link them?
Or build a custom tank to go in the spot of the stock tank, just smaller, then link the Camry and other tank?
Cutting and welding a gas tank is dangerous, I know.
Damn you people.
Got me thinking all the hell over again.........
Really got me thinking on this now.
Here's my issue. I want a flat belly. And longer range, WITHOUT having to take my 2 Jerrycans to the gas station every other day.
I've already got the motor and trans lifted, but lifting the tank is a PITA. It's not like a Taco where you can just take the bed off and cut a couple brackets and weld them higher. Our bodies don't allow us to do that.
When I first started my gas tank build, I was stoked. I wanted nothing more than to be able to finish this tank, and make it work.
Then, I remembered Rob saying he put a Camry tank in the back of his.
This got me thinking even more.
UMMMMMMMMM, why not mod the exsisting tank, and ADD the camry tank to the back, and link them?
Or build a custom tank to go in the spot of the stock tank, just smaller, then link the Camry and other tank?
Cutting and welding a gas tank is dangerous, I know.
Damn you people.
Got me thinking all the hell over again.........
geohil
New member
I'm certain what you suggest can be done. Almost all cars with saddle tanks have a cross-over pipe. My coworker who has a little Lotus Europa he auto-crosses has this set-up and he claims they work great. I imagine we would have to pay special attention that the Camry tank is fraction above the stock tank. I know our EVAP systems are pretty picky so we would have to work through venting issues. Also make sure you are not in an area where smog checks happen - I've heard a lot of the CA guys saying that almost any aux tank won't pass emissions.
The Camry tanks are 18.1 gallons, but fairly flat so you should be able to tuck it up with a skid pretty easily. Still means you have to find a spot for your spare. Why didn't Toyota just have a long range option like ALL of their versions sold over-seas??
I got my tank.....so now I'm committed. Still leaning towards a transfer pump situation over here though.
geohil
New member
I really want to be able to fill both tanks from the stock filler tube. Here is my idea.....please give me your thoughts. Since the Land cruiser ones are tough to find and expensive, what about using a cable operated cast iron exhaust cut-out? Like this one:
http://www.summitracing.com/parts/m...EXgvG5zwdPD_nLAIkKKnv6IKIZb2akLhmLxoCtmTw_wcB
Being cast iron it should deal with fuel well. I can get it in a 2" variety so it will easily handle the flow and clam in place with minimal effort.
Thoughts?
http://www.summitracing.com/parts/m...EXgvG5zwdPD_nLAIkKKnv6IKIZb2akLhmLxoCtmTw_wcB
Being cast iron it should deal with fuel well. I can get it in a 2" variety so it will easily handle the flow and clam in place with minimal effort.
Thoughts?
Doc2012
Senior Member
Well, Since I can't mount my spare under my truck anyway, the Camry tank is a good option to put it in there. As long as the filler neck is on the right side, that being the driver side.
Looking at some pictures, it seems like the filler neck is on the wrong side.
That can be easily rectified, however.
My thoughts on this proposed plan are as follows:
Get a camry tank, and figure out how to mount it.
SEAL the tank. Everything. Except the filler neck.
Make a hole in the tank on the lower corner, and attach another neck to drain into out stock tank.
Mod the 4Rnner filler to go to the Camry tank.
Connect the Camry tank and the 4Runner tank, using the stock 4Runner fill neck, and the added Camry neck.
There should be no need for EVAP and all that jazz. All you're doing as adding another tank. You're not using a pump or anything like that, it's all just going to flow with gravity into the other tank.
NOW, the problem with this, is that you have to figure out which tank will work best.
Looking at some Camry tanks, the new ones seem to be formed to the shape of the trunk space. A square on would work best, IMHO, such as one from the older Camrys.
Atrox Caeda
New member
Like what? One way you fight it, the other you use it... seems pretty simple to me. Are you referring to modification time/effort? Cuz I think wiring a secondary fuel pump would be much more complicated and present way more questions.
geohil
New member
My concern with gravity feed is the pressure 18.1 gallons of gas may have on my stock tank. Prepare yourself for the stupidity that flows through my brain daily....
Mr. Wizard's overly simple example: If you take two cups - a larger and a smaller and connect them with a tube at the bottom of the vessels the pressure tries to normalize. The fluid from the larger cup pushes itself into the smaller cup, and that cup over-flows. So in my pea brain the larger tank will force gas back into the smaller tank causing fuel to creep up the filler neck.
There - now that I've got the crazy out I have one more point. I was hoping to avoid a line below the frame rail so I wouldn't have to worry about snagging it on a rock. A pump allows me the freedom to go above the rails, but does add a degree of complexity in wiring.
T4R2014
Elite Member
I found one. Still expensive but you get what you pay for.
http://http://www.toyota-4runner.org/sale-t4r-items/167025-fs-jdm-lc80-dual-filler-neck-%24450-raleigh-nc.html
geohil
New member
I talked to coinball about that one - just a bit more then I want to pay. Tank, sending unit, and a chunk of steel that will become the skid plate only puts me in at $60 so far. I need to test fit the tank to check if I can make the stock filler location of the Camry tank work with ANY configuration right now.
Atrox Caeda
New member
Hmm... I like where you're heads at. Wouldn't that would only be if the opening for the system (The filler cap) was below the second tank? Other wise it would just rest at the highest point within that line. And if you plumbed them to the same point you wouldn't have any issues... as long as the lowest point in the system was the pump location.
geohil
New member
That probably is the case. I'll mock it up and see what it looks like height and plumbing-wise. If I could run two larger lines between the two tanks, one at the top and one at the bottom it could fill and vent off the OEM set-up. If may make any portion of the aux tank that is above the OEM tank just empty space, but would be an easy solution to the dual filler neck.
Like this fine example on quality sticky note paper. I'm surprised my work hasn't blocked T4R from my computer for all the time I waste here.
Attachments
Atrox Caeda
New member
So if the fuel level was higher than the top of the OEM tank would that cause issue with the breather/evap stuff? Because I think the Camry tank will sit well above the OEM tank.
geohil
New member
That is the million dollar question and honestly why I was thinking of using the sending unit as a transfer pump initially. Too many unknowns.
