Fuel tank in bed of truck

[Dixie_Flyer]

Okay I just bought a used 2016 Ford F250 short bed with a 6,7 diesel engine. Just discovered it has a 26 gallon fuel tank, Thinking about buying a 30 gallon tank from Tractor Supply and placing it in the bed behind the cab. It sits below the bedrails so it won't interfere with the fifthwheel.

My son told me to run a fuel line from the tank to the vent tube at the filler neck with a cut off valve in the line and when I want fuel to go into the factory tank just open the valve and it will flow in by gravity.

My question, has anyone done this? It seems to me the vent tube is there for a reason, stopping it up with fuel may cause some issues.

[Nicholsfamily05]

We have a 50 gallon in the bed of our 2016 3500 Ram.
We love it. Makes it so much easier when traveling
We got ours from Transfer Flow and it is all computerized so we don't have to do anything. It does connect to the to the vent tube.

Second tank we have had. First one was on our 2012 Ram and was 40 gallons.
Wouldn't have a truck without it now.

Lets us choose where we are going to stop and with a 42' fifth wheel it's very helpful.

[fj12ryder]

I use a regular 12v farm-type fuel pump and dispenser to transfer from the 36 gallon tank to the fuel tank. A bit more of a hassle to transfer fuel, but no changes to the filler pipe and no worries about filling too full. And less than $400 for everything.

I wouldn't be without my auxiliary tank, it just makes refueling a breeze. No more worries about whether I can get into and out of that station. Fill up at the end of the day when the 5th wheel is unhooked.

[Colo_Native]

I replaced my factory tank with a 50 gal. from Titan Tanks about $1200 off Amazon best upgrade so far and I still have my bed when the hitch is out of it.

[dmck413]

I have a 40 gallon gravity feed tank that uses an adapter cut into the fill line. I wired in a solenoid and wait for the fuel gauge to fall to 3/4. Then turn on the tank and let it flow while driving. When the gauge fall again I know the tank is empty. Extended my towing range to 600 miles.

[2oldman]

discovery4us wrote:
700+ miles between fuel ups.

What's your MPG?

[discovery4us]

had a 40 gallon bed tank fed into the vent line on my 2005 F-250 and it worked perfectly. installed an inline 12 volt fuel pump as it would gravity feed all but the last 10 gallons. 700+ miles between fuel ups.

Suggest a shut off valve. If both tanks were full the bed tank had enough pressure that it would eventually push out the fuel cap.

[lawnspecialties]

I love using an auxiliary tank. I'm on my second RDS.

This is what flows mine. Both tanks, both systems. Never a problem. Leave it on or go back and forth. Makes no difference.

Install Kit

[dennis1949]

I have a 30 gallon tank It came with an adapter that went into the main fuel line at the filler. So I still have my vent tube. Later put a fuel pump on it and seems to work better

[Tiger02]

Quite a few folks have done this on here. I found a 50 gallon RDS tank on CL, and plumbed it through a 30 micron fuel/water separator into a small 12 volt diesel fuel pump and into a 90 degree brass elbow at the filler neck close to the cap.

I have a switch on the dashboard I use to fill as I travel. I do use a shutoff valve where it exits the RDS tank. I do have to be mindful enough to turn it off when my fuel gauge reads full.

[Etstorm]

I installed a low profile tank in the bed in front of the hitch. I purchased at Northern Tool

So far so good

[MFL]

With these newer vehicles, even using an aftermarket fuel cap can have an adverse affect. Many others add extra fuel tanks, so there's got to be a way.

Not a wt cop, but you may want to see what's left for RAWR/max tire load, before adding heavy tank of fuel.

Jerry