Fuel from auxiliary fuel tank to main tank??? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 02-11-2009, 01:38 PM Thread Starter
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Fuel from auxiliary fuel tank to main tank???

So heres my plan, i'm sure someone on heres done it so wanted to get a little help. Gonna be mounting a fuel tank in the bed of my truck next week. on the bottom of the tank is gonna be a 2 in. section of half in. pipe coming out so i can run a transfer hose to my main tank. I want to be able to pull up to the pump, put 100 some gallons in and be good for a while. I'm pretty sure i've seen it done before. gravity should be plenty to feed the fuel down into the main tank from the auxiliary in the bed i would guess. my question is whats the best way to tap into the main tank. somehow tap into the filler neck or tap into the tank itself? thanks for the help.

2012 F350

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post #2 of 8 Old 02-11-2009, 05:36 PM
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Not a bad idea. There's only one thing I see missing: a fuel water separator between you aux tank and the OEM tank.

In any event, this might help:

http://www.rocketcityrockcrawlers.co...7-06-18_R1.pdf

Good luck.

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post #3 of 8 Old 02-11-2009, 06:37 PM
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drill a hole in the filter neck and have a adapter welded on. then hook up the hose with a on/off valve.


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post #4 of 8 Old 02-11-2009, 07:00 PM
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When I installed my AirDog, it had a separate return for the aerated fuel. Basically a short metal tube that gets installed in the rubber portion of the filler, and has a AN fitting. I bought mine through ITP, perhaps give Dennis a call to see if he can get the individual parts.

As far as gravity feed goes, I am not in favor of it due to the potential issues such as overfilling. For the 150ga aux tank I installed, I used a solenoid so I can select either tank. The solenoid has an electrical switch so the fuel gauge will work on whatever tank is selected. The solenoid I used is similar to this .

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post #5 of 8 Old 02-11-2009, 08:07 PM
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my buddy did the same thing and he taped into the overflow tubing with a T. He put a ball valve on it so he could shut it off. just a heads up make sure the the tank has some sort of vent. his truck starting surging draging a 53' trailer with 3 vans on it goin up the grapevine. had to have his kid hang is head out the back window and unscrew the cap to get it to vent.

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post #6 of 8 Old 02-11-2009, 08:22 PM
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Been running my 110 gal L tank like that for years, there is a drain in the tank... Run a 1/4" hose from there under the truck, drill a hole and weld a fitting into the filler neck, install hose there...

It will ALWAYS keep the fuel tank full, and never overflow. 10 years, 4 trucks all set up the same and never a drop of fuel on the ground...

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post #7 of 8 Old 02-12-2009, 07:11 AM
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Been running a gravity feed for a couple of years, or more. Never had any problems. I have a shut off on the side of the tank and under the bed of the truck. I run 3/8" hose from the tank to the vent line and have a filter in the system as well as you can see below.


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post #8 of 8 Old 02-13-2009, 11:08 AM Thread Starter
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This is why i always ask questions on here first. Somebody will always have an answer...

Thanks fellas.

My buddy is suppose to be done welding me up the tank this weekend (custom size and a whole lot cheaper than buying one). i'll let ya know how it goes.

2012 F350

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