Upgrading to larger fuel tank 2021 F-150

[boo radley]

A quick aside from Titan’s website “Note: For use with diesel fuel ONLY!”

Yes. but there must be an aftermarket for gasoline.

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[Tomatoboy]

Yes. but there must be an aftermarket for gasoline.

I know Transfer Flow makes a 45 gallon one for the 18-20 F-150. They don’t list it for the 2021-2022, and they don’t explain why. It’s not cheap, and they don’t list the precise dimensions, only that it fits in the same space as the 18-20 fuel tank, so it’s not possible just from their website to see if it could be shoehorned into a Powerboost. It’s also out of stock until next year.

 

[‘22Powerboost]

I haven’t driven my ‘22 Powerboost on a long trip yet, but I will be come winter/December when snowmobiling season starts. But I’ve driven my Powerboost down to 1 mile DTE lol, and don’t know if it would have run out when it hit 0, but got gas at 1 mile left according to the gauge.

The mileage that my Powerboost is getting, is far superior to what my 19 KR was getting in every way. I had the 36 gallon tank in my 19, was great for towing, but I think my ‘22 Powerboost with the 30.6 is gonna be even better. I wouldn’t be worried if you’re moving to the hybrid with a slightly smaller 30.6 gallon tank…that’s still a big tank, and the superiority of the hybrid in regard to efficiency, is going to make up that small difference imo.

 

[hotrodmex]

They don’t list it for the 2021-2022, and they don’t explain why.

Probably because though it may fit, it has to be CARB certified (in addition to the 25 or so other states that essentially run the same regs) for those years to sell it as such. For looser states I bet they'd ship it if you called.

It’s not cheap

See above, lol. Back in the early 00s it was something like $20,000 to get a part certified, Probably way more now. Plus you had to have a few of the vehicles in basically new condition.

If I understand it, you're saying that the last few gallons (in my case, 5.5 gallons) may not be useable by the truck if I am going downhill? Is that correct?

I would say it's a higher possibility than not, though I wouldn't necessarily be scared of it. Search for something like "F150 won't start parked downhill" on the web and you'll see about the issue of low levels on the large tank causing fueling issues when the front is pointed downhill. Ford has been using this tank for a few generations already.

Also, running your tank to empty is not a great thing to do. You pump will definitely be running dry in spurts if you run that giant tank down to 1-2 gallons of fuel. Put a single gallon of water in a standard bath tub then slosh it around and see how little is in some places.

Re: the dealer, he's had multiple people reporting the problem and wants me to bring my truck in,

It's the same for everyone I've seen, and even who have posted here, so I'm sure he's had other people ask. It's not a problem, people have a problem with it.

Update: I read the FORSCAN link, and the short answer may be that my truck THINKS it has a smaller tank than it actually has, and that FORSCAN will allow me to inform the truck of its actual tank size.

No, more that people who have an issue with the way Ford has programmed the gauge can change it if they need to.

Nothing is wrong, some just don't like it, and want it to work in a way they understand better.

Personally, I like how it works with the large buffer.

 

[Gros Ventre]

21 Powerboost: I have observed that once I get down to less than 200 miles DTE the fuel level gauge and DTE calculation is accurate. I have concluded this based on tank refill gallons. For example with a 50 miles DTE which means something like 2 to 2 1/2 gallons left in the tank, that I refilled with right about 28 gallons. If I refill with a DTE of 200 miles, then the refill is right about 20 to 22 gallons. The DTE calculation changes depending on speed. I live in Wyoming, if I travel on I-80 where the speed limit is 80 mph I get about 20-21 mpg as opposed to local roads where I see about 25-26 mpg. However the DTE calculation above 200 miles DTE is far more variable and I've learned not to depend on its accuracy.

 

[imnuts]

21 Powerboost: I have observed that once I get down to less than 200 miles DTE the fuel level gauge and DTE calculation is accurate. I have concluded this based on tank refill gallons. For example with a 50 miles DTE which means something like 2 to 2 1/2 gallons left in the tank, that I refilled with right about 28 gallons. If I refill with a DTE of 200 miles, then the refill is right about 20 to 22 gallons. The DTE calculation changes depending on speed. I live in Wyoming, if I travel on I-80 where the speed limit is 80 mph I get about 20-21 mpg as opposed to local roads where I see about 25-26 mpg. However the DTE calculation above 200 miles DTE is far more variable and I've learned not to depend on its accuracy.

Same experience here. I know within a ½-1 gal how much fuel I'm going to be getting as the DTE reading drops.

 

[Atlee]

There are after market fuel tanks for the 2021 F150. The 3.0 Powerstroke guys have upgraded their trucks.

IIRC, there is at least a 40 gallon tank. One guy change his out in his driveway on a Saturday. Obviously you have to recalibrate the fuel guage.

https://titanfueltanks.com/amfinder?find=2021-ford-f150-4869&sid=76DcM4NvS6

Much easier to legally replace diesel tanks than it is gasoline tanks. I think it has to do with the high volatility of gas vapors compared to the low volatility of diesel oil.

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