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Old 04-28-2022, 09:34 PM   #1
03Roadking
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Extra fuel tank

I'm considering installing a aux fuel tank. Looking for pros and cons of a gravity feed over a pump transfer from those that have one installed.

TIA
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Old 04-29-2022, 08:36 AM   #2
Notanlines
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Jim, we have the 48 gallon aluminum tank in our 450, third truck to use the same tank. No problems with installation nor is use, all gravity feed. We have about 300,000 miles on the tank over 3 trucks and have only replaced the cap because I broke it (ran over it in the gas station driveway.) PM me if you like and I'll send you photos/give you my phone number and explain anything to you.
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Old 04-29-2022, 10:26 AM   #3
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Do you want to loose tool box space with an in bed tank? A TITAN 55 gallon replacement tank is a nice option.
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Old 05-04-2022, 06:39 PM   #4
03Roadking
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I had looked at them, 19 gallons would be a help for sure but was thinking more towards a 40 or 50.
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Old 05-05-2022, 07:29 AM   #5
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With the 48 gallon flat in the bed and our aluminum tool box hung from the rail as usual there is a 2 to 3 inch gap between them. No problem with taking up tool box space unless you have the ultra-deep box.
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Old 05-09-2022, 03:23 PM   #6
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Four years ago I installed a 40 gallon DeeZee aluminum tank. At that time the tank was only $396.00. A lot more today. Initially I installed a solenoid valve with a switch in the cab of my truck. So it was basically a controlled gravity feed. Those solenoid valves can get very hot if left on too long. In fact I burnt one up. Then I decided to go with an in-line low pressure fuel pump (5-9 psi). Even with the pump off it will still gravity feed until there's about 20 of my 40 gallons left. I'm assuming there's not enough pressure with the 20 gallons to continue to gravity feed. When my main tank starts to move from full then I know I have about 20 gallons left in the aux. When my main tank gets to about half full, I activate the inline pump and it starts to fill my main tank. Some would consider this an odd setup but it has worked for me for the last 3 years and we are full time traveling at least 6,000 miles per year.
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Old 05-09-2022, 03:32 PM   #7
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I installed an RDS 40 GA tank / tool box, I use a fuel pump to transfer fuel when stopped. The tank is low profile, so if fits under my tonneau cover. I didn't go with the gravity method because I don't want to give Ford any excuse to deny warranty (yes very paranoid), also the truck's computer (distance to empty) doesn't handle fuel being added while moving. Usually we have to stop due to full bladders (human and canine) so stopping to move fuel isn't a big deal.
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Old 05-09-2022, 04:03 PM   #8
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Quote:
Originally Posted by 03Roadking View Post
I had looked at them, 19 gallons would be a help for sure but was thinking more towards a 40 or 50.
33 gal gravity feed here. Works great but I wish I gotten 40-50 gal.

The OEM larger capacity replacement is the best solution but at the time it was more than 2x the cost of the 33aux tank. Not worth it to me.

Now I usually fill at the start of the day before hooking up and don’t worry all day!!!
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Old 05-09-2022, 06:11 PM   #9
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Sounds like a lot of additional driving around to have all this extra fuel.
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Old 05-09-2022, 07:00 PM   #10
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Originally Posted by Cummins12V98 View Post
Do you want to loose tool box space with an in bed tank? A TITAN 55 gallon replacement tank is a nice option.
Because I can carry 80 gallons, 1200 mile range and still have the tool box. Truck gets fill from the tank and the tank from the pump, fuel stays fresh. I fuel when I want not when I have to, I can check my route for the best fuel price. Reds a dog ramp I carry right there.
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Old 05-09-2022, 07:08 PM   #11
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Another vote for the TITAN 55 gal. Just put one in my new F350. Only regret is why oh why didn't I do this 5 years ago when we started towing!
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Old 05-09-2022, 07:25 PM   #12
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I love the KSH tank and the flexibility it provides.
It works well with my Truck covers usa roll top cover and very small tool box.
60 gallon Capacity. Gravity feed with solenoid.
The solenoid is controlled by the ford factory installed up fitter switches.

As mentioned the solenoid is a option that is not required.
I have had a solenoid go bad, but overall gravity feed with a in line valve works just fine. The solenoid is just for convenience.
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Old 05-10-2022, 10:22 AM   #13
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Because I can carry 80 gallons, 1200 mile range and still have the tool box. Truck gets fill from the tank and the tank from the pump, fuel stays fresh. I fuel when I want not when I have to, I can check my route for the best fuel price. Reds a dog ramp I carry right there.
I wish you the best of luck on the tool box that is above bed height.
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Old 05-12-2022, 06:54 PM   #14
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I wish you the best of luck on the tool box that is above bed height.
Whats the issue with above bed tool box? The hitch is well behind the tool box/fuel tank I estimate 30,000 miles pulling my 14K 5W. Unless I get close to a 90 I have no issues, I do have to watch the pump if I jack knife that far or very unlevel ground. Only picture was before the tank went in, lots of room. I'll get another picture when I get the truck back, getting a water pump and C4 pump filter.

With 750K long haul miles in my own class 8 truck, I was in the you break you buy class so I watch everything. My truck has the long bed, I hate half a truck with a short bed, can't even get a sheet of plywood or dry wall in.
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Old 05-13-2022, 11:24 AM   #15
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Issue is tight turning and having the truck and RV on different planes. YOU may not have an issue with this but there is a reason the proper RV tool box type is bed height.

I have seen damage from the above bed tool boxes hitting the lower front of the RV.
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