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Old 07-16-2009, 04:23 AM
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auxiliary tank?

Anyone familiar with the law on auxiliary tanks that are gravity fed into there OEM tank, or pumped into using a switch inside the cab? Is it legal, does it vary state to state? Any info where I can find this information if it does vary state to state? I am looking to purchase a auxiliary tank, 90+gallon, but I want to do away with the standard pump and hose deal?
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Old 07-16-2009, 08:30 AM
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i have on om my truck and i believe that the limit is 150 gallons. anything over that you may actually be required to have a hazmat license... and there are no laws against gravity flow aux tanks. maybe in california. and dont bother with any switches, just go with the gravity flow it works well. i would however put a filter on the flow line. aux tanks tend to accumulate "trash" that could harm your pumps and injectors. ill try to post some pics of my setup. its pretty nice.
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Old 07-16-2009, 08:35 AM
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Great! Ide appreciate any info about your tank and kit that you used for the gravity sytem. Definitely agree with you on using a filter, thanks for your help.
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Old 07-16-2009, 08:36 AM
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i have a 70 gallon, aux tank in my bed , i has the built in pump that pumps it over to stock tank, can go right at 1300 miles non stop , its great , there is no law here that says you cant do it , but i do think there is a limit on gallons like said before
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Old 07-16-2009, 08:49 AM
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believe i got the set-up from napa. i cant remember. ill go check it all out ltr today nad try to post some stuff. i just used the same set-up you see on the top of some tanks with a pump underneath the bed so its all hidded.
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Old 07-16-2009, 04:15 PM
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Can someone explain how to do the gravity fed system do you just take a hose from the aux tank and tap it into your filler hose on the truck? If so then do you just fill from your aux tank instead of the truck tank?
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Old 07-16-2009, 04:44 PM
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here in michigan you cant have a tank that is over 100 gal as a transfer or aux tank. gravity feeds tap into the fill neck of the OEM tank, you can fill either or, if your OEM tank is empty and you fill the aux tank it will go right into the OEM tank.
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Old 07-16-2009, 07:08 PM
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I believe in CA an aux/transfer tank cannot be larger than 100gal w/out placards. The tank has to be securely mounted, some guys just use them as a "slip in" and don't bolt the tank to the bed, this will cause major problems w/CHP. Other than that everything else should be good.
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Old 07-16-2009, 07:55 PM
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Quote:
Originally Posted by Stroked7.3 View Post
Can someone explain how to do the gravity fed system do you just take a hose from the aux tank and tap it into your filler hose on the truck? If so then do you just fill from your aux tank instead of the truck tank?
I have a system that I had inspected at the local truck scales in Fremont, California, I880 Northbound. 49CFR, the federal regulation, You have to have a device that will not allow the fuel to keep flowing if the vehicle in on it's side or on it's top. Something like this is required for the gravity system: Northern Tool Diesel Install Kit for Auxiliary Diesel Fuel Tank — Fits Ford and Dodge Trucks, Model# 011025 Customer Ratings & Reviews - Top & Best Rated Products

I bought mind from RDS directly, that is who supplies it to Northern Tool. I also installed a ball valve under the bed of my truck accessible from the side of the truck so I can turn the tank off completely for travel to Canada(they don't like aux tanks). The cap of the tank on my truck is double duty, it vents as well as allows air to flow in so it flows pretty fast. The installation kit with the cap I have were the two big things they wanted to see.

The flow from the aux tank is too slow to keep up with the filling station so you fill the tanks seperate and I close the ball valve when I fill the truck up.

Here is some good reading: Justia :: 49 C.F.R. §*393.65***All fuel systems. and here : Justia :: 49 C.F.R. §*393.67***Liquid fuel tanks.
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