Auxiliary Fuel Tank/Tool Box Thoughts/Advise

FireRob wrote:
Hello once again, been awhile since last post, probably a good thing meaning I haven't had any problems.

The short and sweet:

Looking for a combo Auxiliary Fuel Tank/Tool Chest. If you don't want to read any further by all means go ahead and tell me what you know, Ill read it. If you want more details read on.

Long Story long:

Looking to get an auxiliary fuel tank to add to my truck. I did some minor research several weeks back but not much since. It was enough to raise some questions. Id like to get a combo unit that has the fuel tank and tool box because I have always had a tool box on my trucks and don't want to be with out one. I have found three options,

Option 1 is a siphon/gravity fed type that as fuel is used in the OEM tank it is automatically replaced with fuel from the aux tank above and basically your fuel gage never shows a drop in fuel until you have used all fuel in the aux tank. The Option 2 I have seen is the pump fed tanks that once the OEM tank drops below a 1/4 tank a pump in the aux tank kicks in and refills the OEM tank. First option being much cheaper than the second.

My concerns about option 1 came from reading the sales info from a manufacture of a option 2 type tank. They said with their system you wont get the check engine light that you would from using a option 1 style (syphon/gravity). Basically they stated that with a option 1 the fuel gage always reads full and the truck assumes something is wrong with the gage and then the check engine light comes on. Is this true? Anyone have first hand experience? According to reviews it was Chevy and Ford owners who were having this problem. Maybe Dodge/Ram owners are as well and just didn't say anything about it. (I have a Ram incase you didn't know)

Option 3 Is replacing the OEM fuel tank for an aftermarket one that is much bigger. Don't really want to do this one....

Thanks in advance for any advise and words of wisdom or caution you might have.

I have had a gravity feed in a 2013 Ram Cummins and now in my 2016. No problems what's so ever.I even go as far as when I don't need both tanks (in between long trips) I just fill up the tank in the back of the truck and let it gravity feed into the main tank. I hate sticking a nozzle in the capless filler neck on the truck. It feels like it's going to rip the flaps right out of it every time I pull it out. One of these days I'm going to be seen with a fuel nozzle sticking out of the side of my truck going down the road. LOL