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1994.5 - 1997 7.3L Power Stroke Diesel  

aux-tank hook up

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Old May 24, 2012 | 07:58 PM
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aux-tank hook up

hey guys i picked up an aux-fuel tank to put in the bed of my truck. its not really big, i think about 15-18 gallons enough to fill the gap between my tool box and the bed floor. anyway i was needing a little help on how to tap it to my front fuel tank. if u have pics please post, that will help very much.
 
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Old May 24, 2012 | 08:21 PM
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stainlessstroker95
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From: Monroe City in
Im no help on the hook up but just wondering wat kind of tank you got and where at.
 
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Old May 25, 2012 | 09:56 AM
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stainlessstroker95, it is actually a homemade aluminum tank i picked up at a junkyard. the guy was my dads friend and let me have it for 20 bucks. i couldnt pass that deal up, its not professional built but it works and still looks decent. ill post some pics of the tank in a bit.
 
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Old May 25, 2012 | 10:32 AM
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This is what I'm trying to install under my toolbox







This last pic is a drain on the bottom side of the tank. I'm gonna have to cut a hole in the bed so it can sit flat.
 
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Old May 25, 2012 | 11:09 AM
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my biggest confusion is that if i try to tap into the filler neck hose is that there is hose in the hose. can i just tap into the outer one and be ok or will i need to do it differently.
 
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Old May 25, 2012 | 12:01 PM
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The problem with just tapping in that way is that the fuel will flow form the aux tank continue to fill the stock tank until it overflows since the aux tank in the bed is higher than the top of the filler neck. Your best bet is to tap into the fuel filler neck and use a small pump with a check valve in it. That way you can switch on the "transfer" pump and refill the tank, and then turn it off after the tank is full, stopping the flow of fuel. The only way to get around using a pup or a valve of some sort is going to be to mount the aux tank low enough that it is no higher than the top of the filler neck.
 
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Old May 25, 2012 | 12:09 PM
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Nate, that is actually the way i had thought about doing it. i wanting to a pump to control the overflow. can i use any external pump from the parts store and be ok? also can i just tap the filler neck hose or do i need to remove the hose inside the filler neck?
 
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Old May 25, 2012 | 12:22 PM
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I don't see anything wrong with tapping the filler neck hose. It has to be rated for the exposure to the diesel since it serves at the breather while you're filling up. Of course you could always tap into the filler neck up high where it is still steel line too. That might be a simpler way to do it. As far as a pump goes, as long as it is rated to move diesel, I would think you could use just about anything. It doesn't have to be a high flowing pump either.
 
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Old May 25, 2012 | 12:24 PM
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cool. thanks nate. im gonna try that route see how it works out.
 
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Old May 25, 2012 | 12:37 PM
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I would personally tap into the return line going to the front tank, much cleaner and easier, just need some line and a small T fitting, aside from a pump
 
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Old May 25, 2012 | 02:00 PM
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I've been looking into this as well, taping into the filler neck is just fine. There is. Company that sells a splice kit with a special valve to prevent over filling but is only for gravity feed, sorry I forget the name of the company. I planned on tapping into the metal part and use a pump and turn it on and off manually when the gauge reads full. Napa sells a pump that puts out 8psi and 100 gph, hp6001, I believe is the part number. It's a little more expensive but made for diesel fuel.
 
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Old May 25, 2012 | 11:46 PM
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From: Monroe City in
That is a good looking tank and a good price too. I would like to find some thing like that to fit under my toolbox. Let us know how you end up hooking it up.
 
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