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Old 04-25-2016, 11:06 AM
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Default AUX fuel tank

Ive got a 30 gal tank im prepping to install. Im having a hard time finding a straight answer on what size the filler neck is on these trucks. Ive heard the ID is anywhere from 1.25" to 3". If I cant find the answer, I'll just snip, measure then go to the store, but it sure would nice to have all my parts in advance. TIA for any answers.
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Old 04-27-2016, 11:22 AM
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ID of fuel hose coming off the filler neck is 1.5". Thought I would add incase anybody is looking for this answer in the future. Cheers
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Old 04-27-2016, 12:52 PM
TripleStrokes TripleStrokes is offline
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Good to know .. thanks 06.
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  #4  
Old 04-29-2016, 12:46 PM
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yeah i just bought the rds auxiliary fuel tank hose kit for mine from northern tool and it was simple to install
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Old 05-01-2016, 07:02 PM
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Run it to the vent line. By the parts at the hardware store.
I put a 90 in my truck a few weeks ago. This is the 4th one I put in and the first through the vent. I won't install them any other way now.
Get a 90 from the tank, little valve, hose barb to size of line you like. I used 3/8" this time.
Get 1/2" hose barbs and tee along with 1/2" hose barb to size of line you run.
Cut vent line and put in.
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Old 05-02-2016, 06:12 AM
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That's what I did. Works great.
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Old 05-02-2016, 08:22 PM
jcain jcain is offline
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What's the benefit of using the vent line?
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Old 05-03-2016, 04:52 AM
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Nothing other than it is easier to install in the vent than the metal fill line, cheaper for the parts and then you can use any size line you like.
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Old 05-03-2016, 06:59 PM
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So how does the factory tank vent while the vent line is occupied with fuel during gravity feed?
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Old 05-03-2016, 07:07 PM
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Through the main line.
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