Auxiliary Fuel Tank

[Sean K.]

Good question. The psi of the pump doesn't matter because it's just transferring the fuel to the main tank. This pump is "free flow" rated at 100 gallons per hour, that means I can pump all 16 gallons of auxiliary fuel in less than 10 minutes. I've used variations of this pump for years to transfer fuel in the shops I have worked for and I've never seen a failure, they are super reliable.

Thanks for the info. Carter has a good reputation for quality pumps.....I was just curious about the PSI.

 

[Dirtco]

Any plans for a skid plate or something to protect the tank from rocks, branches, etc.?

I plan on having something, but I'm not sure what that will be yet. I really don't want a full 3/16" skid plate due to the extra weight. I'll figure something out, just need to get it in place first and go from there.

 

[Dirtco]

I got the second fuel tank support in place, so I was able to mock the tank in place and see how high I was able to get it. I was pleasantly surprised when I got it in place and took some measurements, it sets just a little over an inch below the frame rails. Once I get some real tank straps under it I should be right at an inch, you can't even see it when walking around the truck!

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[rkntoy]

Any more thoughts on filler routing? I am about to give up on my aux tank idea as I cannot figure out a filler solution that I like.

 

[AssBurns]

Any more thoughts on filler routing? I am about to give up on my aux tank idea as I cannot figure out a filler solution that I like.

Why not buy a filler neck with a cap and have a separate filler neck for the aux tank? Like this.
http://www.tanksinc.com/index.cfm/p...t_id=510/category_id=166/mode=prod/prd510.htm

Sent from my iPhone using Tapatalk

 

[rkntoy]

Why not buy a filler neck with a cap and have a separate filler neck for the aux tank? Like this.

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Yes, but where do you mount it.

 

[AssBurns]

[MENTION=135317]rkntoy[/MENTION] Weld a tab on it and mount it to the same bolt that the factory filler neck bolts to. Should be pretty easy to do.

 

[jkeith.w]

Why not buy a filler neck with a cap and have a separate filler neck for the aux tank? Like this.
Universal Fuel Filler with Aluminum Cap

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So the aux tank on my '74 F100 is done this way - fills through the wheel well!

 

[jkeith.w]

Any more thoughts on filler routing? I am about to give up on my aux tank idea as I cannot figure out a filler solution that I like.

Why not modify the filler for a Y? fill both tanks with factory fill tube?

 

[rkntoy]

[MENTION=118730]AssBurns[/MENTION] - then where would it go? As this is for an aux tank I still need to fill my main tank.

[MENTION=28464]eimkeith[/MENTION] - not a big fan of the wheelwell mount with all the dirt and mud kicking up there. Also it would end up being not much higher than the tank. The LC80 dual tank Y would be awesome but cheapest i found was $400. Living in Oregon a simple Y is a problem since the state says I am too dumb to fill my own gas tank without blowing up the gas station.

I should probably start my own thread and give [MENTION=67615]Dirtco[/MENTION] back his

 

[jkeith.w]

[MENTION=118730]AssBurns[/MENTION] - then where would it go? As this is for an aux tank I still need to fill my main tank.

[MENTION=28464]eimkeith[/MENTION] - not a big fan of the wheelwell mount with all the dirt and mud kicking up there. Also it would end up being not much higher than the tank. The LC80 dual tank Y would be awesome but cheapest i found was $400. Living in Oregon a simple Y is a problem since the state says I am too dumb to fill my own gas tank without blowing up the gas station.

I should probably start my own thread and give [MENTION=67615]Dirtco[/MENTION] back his

I hear ya on the LC80 filler - whew!

 

[Dirtco]

Any more thoughts on filler routing? I am about to give up on my aux tank idea as I cannot figure out a filler solution that I like.

I bought a stainless steel marine fuel filler assembly

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It will roughly be in this location. I still need to mock up a bracket for the filler, but you get the point.

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[rkntoy]

I bought a stainless steel marine fuel filler assembly

I like the duct tape! I was looking at those too. I may try and see if I can hole saw a spot on my savage rear bumper

 

[Dirtco]

I got the tank painted and ready to install. The tank was designed around an in-tank fuel pump and had three opening in the top, one for the pump, sender and fuel filler. The in-tank pump was expensive, and would had dropped the tank another inch or so, I capped off all the factory holes and made my own filler, pick up and vent on the side of the tank.

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I felt more than confident about the welds, but this is gasoline we are talking about. So I went ahead and sealed the welds with JB Weld just to make sure there wasn't a small pinhole that I couldn't see.

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Before the tank could go in I had to address a few more things. First the exhaust pipe, it was a little close to the tank. I clearances the tank as much as I could, and installed some heat shield on it. I also wrapped the exhaust pipe with fiberglass heat shield.

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The tank came with cheesy 18 gauge tank straps, there's no way they would have worked in an off-road application. I made some new straps out of 1/8" steel strap and installed foam on both sides of the mounts.

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[Dirtco]

And here is the picture that makes all the work worth it!

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[Dirtco]

Fuel pump installed

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On/Off valve for the filler hose

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[Dirtco]

On to the fuel filler. I had a plan to install it in the rear bumper, but that changed after getting the tank in the truck. It turns out that the filler was setting lower than the tank, so I had to go to plan B. I installed the filler in the rear wheel well, it was the only reasonable place I could find (without creating a ton of work). Before I drilled the hole I drove to the gas station and verified that I could get the nozzle in there without any issue's.

I also had a change of plans when it comes to the vent hose. Originally I had planned to vent the auxiliary tank into the main tank vent hose, but that would require venting the main tank (removing the cap) while fueling the second tank. It's not a big deal, but it opened the door for leaks and other issue's on the main tank that could trigger a CEL, etc. I decided to isolate the two systems as much as possible and simply vent the second tank to atmosphere. I installed a manual valve that I open to fill the tank, and to transfer fuel. I do have to remove the main tank fuel cap to transfer fuel, but that is a good thing because I can hear the fuel being transferred (and if the second tank starts running low) and I can't overfill the main tank.

Anyways, on to the pictures

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[Dirtco]

Filler hose

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Other side

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[enapa]

Nice! Have you thought about some type of swing down plastic cover to put over the aux filler cap? In that position I would be worried about mud, but also rocks maybe being flung into the cap and damaging it.

 

[rkntoy]

Trying to follow the plumbing - does the ball valve turn off and on the vent line?

I was hoping you would come up with a different filler mounting location but you ended up with about the only spot - unless you want the tank hanging way down.