I am looking to install a 60 gallon RDS gravity tank in back of my 2015 chevy 3500HD dually. Looking for some answers before purchasing.1) can you fill your main tank as you drive2) will it stop filling when main tank full automatically3) does truck have a problem when fuel gauge always reads full until RDS tank is empty.4) Do I add a fuel filter and water seperator(any suggestions.)Thanks for the helpDEnnis

Yes you can. I would wait until I got down to a 1/4 tank and turn the valve on. When your tank gets full you can leave it open and you shouldn't have a problem. I did not. But it is so easy to turn the valve off sometimes I would then just turn it back open when at a quarter tank.The system is sealed and should not cause any problems but refer to above. Every once in a while I would have to turn off the ignition and restart to correct fuel gauge. Can't remember the exact issue but that always solved the problem. I added nothing but some do. I do not think it is necessary. Overall the gravity feed works perfectly and I used this on my 08 and 2011 duramax. I purchased the 50 gallon with a tool box on top. It was still below my bed rails so if I wanted to use a cover I could. All and all very happy with this purchase.

dennych1 wrote:I am looking to install a 60 gallon RDS gravity tank in back of my 2015 chevy 3500HD dually. Looking for some answers before purchasing.1) can you fill your main tank as you drive YES 2) will it stop filling when main tank full automatically YES3) does truck have a problem when fuel gauge always reads full until RDS tank is empty. NO4) Do I add a fuel filter and water seperator(any suggestions.) NOThanks for the helpDEnnisI have a 91 gallon RDS tank in my truck. Works great. I can turn it on and off at the tank. On the road I just leave the valve open and it feeds the main tank as I drive. I only add fuel to the RDS. It also has a tool box on top that is real handy. I can tow from Tucson to San Diego and back (900+ miles) without having to stop for fuel.

Thanks for the help. Still not sure what tank I'm going to get

dennych1 wrote:I am looking to install a 60 gallon RDS gravity tank in back of my 2015 chevy 3500HD dually. Looking for some answers before purchasing.1) can you fill your main tank as you drive2) will it stop filling when main tank full automatically3) does truck have a problem when fuel gauge always reads full until RDS tank is empty.4) Do I add a fuel filter and water seperator(any suggestions.)Thanks for the helpDEnnisI have a 95 gal RDS with gravity flow now in the 2016 Ram but before it was in a 2011 Chevy. 1. leave the valve open all the time, DIC tells you how much you have used and when gauge starts going down you know the aux is almost empty.2. yes, never overflows3. no, works fine, DIC always has correct info4. up to you, I always felt better using a filter of some type between the aux and main tanks.Wouldn't be without it, probably the best thing I've ever added.

Do you guys ever wish you could pop the tank out to use all of your bed's capacity? That is making me lean toward a tank with a transfer pump.

RDS auxiliary tank | Good Sam Community

dave17352
Explorer
Jul 09, 2016
Yes you can. I would wait until I got down to a 1/4 tank and turn the valve on.
When your tank gets full you can leave it open and you shouldn't have a problem. I did not. But it is so easy to turn the valve off sometimes I would then just turn it back open when at a quarter tank.

The system is sealed and should not cause any problems but refer to above.

Every once in a while I would have to turn off the ignition and restart to correct fuel gauge. Can't remember the exact issue but that always solved the problem.

I added nothing but some do. I do not think it is necessary.

Overall the gravity feed works perfectly and I used this on my 08 and 2011 duramax.

I purchased the 50 gallon with a tool box on top. It was still below my bed rails so if I wanted to use a cover I could.
All and all very happy with this purchase.

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