It has always been one of my pet peeves getting fuel in a crowded fuel station and nobody willing to give you an inch to get to the pump. Well today I think I might have solved that problem. I installed this 40 gallons RDS tank and now I have a range of about 900 miles on my rig. Now I will be able to get where I am going and fill the truck without the fiver attached. This is how the install went. I set the new tank inside the truck it fit perfectly. Drilled a couple of holes to hold it down. Before I locked it into place the cramped work began. 
I had to take the fill spout out and cut a section out so the new valve would fit in place. Then splice it all back together with hose clamps and hose extensions. Man talk about tight. It was like working in the bilges of my boat. With that done I needed to take the hose and drill a couple of holes in the truck bed one for the fuel line to attach to the new fill tube and one for the venting of the tank. This is where the holes were drilled and the tube that connects to the new tank. 
This shot shows the vent tube that travels down the back side of the fuel tank to the undercarriage of the truck And the fuel line going down to the fill spout
All in all a pretty fun project I will let you know how it all works in a couple of weeks. I am planning my first trip with the new set up just to see how it works. RDS seems to make a pretty darn good tank.
I had to take the fill spout out and cut a section out so the new valve would fit in place. Then splice it all back together with hose clamps and hose extensions. Man talk about tight. It was like working in the bilges of my boat. With that done I needed to take the hose and drill a couple of holes in the truck bed one for the fuel line to attach to the new fill tube and one for the venting of the tank. This is where the holes were drilled and the tube that connects to the new tank. This shot shows the vent tube that travels down the back side of the fuel tank to the undercarriage of the truck And the fuel line going down to the fill spout All in all a pretty fun project I will let you know how it all works in a couple of weeks. I am planning my first trip with the new set up just to see how it works. RDS seems to make a pretty darn good tank.
Moderator edit to re-size pictures to forum limit of 640px maximum width.
I put in the KSH 45 gallon fuel tank tool box combo.
The tank itself was decent quality, but I did have to do some small mods ensuring its longevity. One problem was the rivets on the hinge lid, they were not set properly on each end of the hinge allowing them to work. A few openings of the lid would eventually cause them to loosen, so I drilled and added two flush, stainless flat-head screws with nuts on each end, problem solved. The install kit is overpriced for what you get in my opinion. It comes with two lengths of 5/16 and 3/8 hose, several clamps, a fill pipe hose inlet, a Chinese made electric pump and some wiring with a toggle switch. The pump's electric connections are not very good, They are a slip on type and easy for them to fall off. The US made version of the same pump has its electric connections made with nuts and washers. The filler pipe connection was not the right size to fit the filler hose on my F350 and there was not much room to clamp on the filler hose and no barbs, I expected it to leak.
I ended up modding my filler neck as shown, the fuel is pumped in the main hose and the breather is for the aux tank is added to the filler neck breather pipe.
Overall, not a bad tank, decent room in the tool box area, however no instructions that match any of the equipment are included, so as long as you're confident plumbing fuel lines through the bed, running electrical through to the cab, it is not a tough install. I would have preferred not to have to make so many adjustments to make the locks and latches work properly and beef up the hinges, for the price it should work right out of the box.
The tank itself was decent quality, but I did have to do some small mods ensuring its longevity. One problem was the rivets on the hinge lid, they were not set properly on each end of the hinge allowing them to work. A few openings of the lid would eventually cause them to loosen, so I drilled and added two flush, stainless flat-head screws with nuts on each end, problem solved. The install kit is overpriced for what you get in my opinion. It comes with two lengths of 5/16 and 3/8 hose, several clamps, a fill pipe hose inlet, a Chinese made electric pump and some wiring with a toggle switch. The pump's electric connections are not very good, They are a slip on type and easy for them to fall off. The US made version of the same pump has its electric connections made with nuts and washers. The filler pipe connection was not the right size to fit the filler hose on my F350 and there was not much room to clamp on the filler hose and no barbs, I expected it to leak. I ended up modding my filler neck as shown, the fuel is pumped in the main hose and the breather is for the aux tank is added to the filler neck breather pipe.
Overall, not a bad tank, decent room in the tool box area, however no instructions that match any of the equipment are included, so as long as you're confident plumbing fuel lines through the bed, running electrical through to the cab, it is not a tough install. I would have preferred not to have to make so many adjustments to make the locks and latches work properly and beef up the hinges, for the price it should work right out of the box.
Moderator edit to re-sie picture to forum limit of 640px maximum width.
profdant139 wrote:
Now if someone could come up with an auxiliary tank to extend MY range, I would really get excited. I have to stop more often than my little truck does, and it is a gasser holding only 20 gallons, and I get 10 mpg when towing, and I often have to stop while there is still plenty of gas in the truck.
Oh, well.
This year I put together my own using a 15 gal Blitz brand gas "station" (they are out of business but I found a local store that had a NOS one for $100)..
I bought a Carter electric fuel pump (1.2 gal per minute) for $100..
Added a fuel filter, some fuel line and a few fittings, cost was about $250 for all.
Put it the bed of my truck under my cover.. When I got to half tank or more we simply took the next rest stop and while the family was taking care of business I transferred the gas from the "station" to the truck tank.
Took all of 10-11 minutes which is less than half the time I spend at gas stations and we were able to cut out over half of our fuel stops.. Saved us several hrs of travel time on a 1,500 mile round trip this year.
Was kind of nice to be able to take full advantage of our 2013 F250 with factory 39 gallon tank. Always had several spots in our trip which have a long, long distance between gas stations and the extra 15 gallons meant that we did not have to short hop any more.
Amazon does have a similar tank under a different brand name but it is a bit more expensive.
I had been considering using a marine fuel tank with a electric fuel pump.. You can get them in many sizes and configurations..
On edit.. Should note I ran the wires into the electrical box and put a switch under the weather proof cover and all metal items are grounded together for safety.
Mounted the tank on 2x6s to provide stability so it would not tip over..
1slomofo wrote:
I wanted to do the same thing...I have a diesel that only has the 26 gallon tank, but I already had a truck tool box that I really liked and didn't want to replace... So I had a custom one made from some measurements I took. Then I coated it with bed liner myself.
The new tank carried over 25 gallons. So I can now carry about 51 gallons! I am using the same gravity feed kit you are. Super awesome!
That is the best Idea I have seen yet! I have had no problems getting fuel ever. I don't worry about saving a few cents here or there it's just not worth it! I buy at the truck stops or TravelCenters that have plenty of room. If I am traveling in an unfamiliar area I will take a 5gal container full of diesel with me.
If I were to do an extra tank I would replace the factory with a larger tank. I have a 30" front to back bed height HighwayProducts tool box and I would not be without it. Looks like I could add a tank like you have and still use my tool box. Great idea!
