(1999 v6 f150 step-side)what’s the biggest gallon oem gas tank that will fit with no modification? I’m looking for a bigger tank.

 

From your owners manual:

Fuel tank

4x4 Reg. Cab short wheelbase 92.7L (24.5 gallons)
4x2 Regular Cab and all SuperCab short wheelbase 94.6L (25.0 gallons)
Long Wheelbase 113.6L (30.0 gallons)

 

so I can swap to a 30 gallon tank?

 

Probably not. If you had a long wheelbase it would have come with the 30 gallon tank.

24.5 gallon - 49" long
25 gallon - 57" long
30 gallon - 66" long

 

Are you just lazy to fill it up? Or trying to go on some extended road trip?

Adding more weight will reduce mileage...

If you must, get a transfer tank and put it in the bed and fill yourself up...

 

🤡🤡🤡

 

???

 

I would assume nothing bigger will fit, because Transfer Flow (a forum sponsor) does not list a replacement tank for your truck, just in-bed transfer tanks. They are $1500.

Jimbo, I assume that was a response to your somewhat rude comment.

 

you talking ****... you calling me lazy. Because i want to put a bigger gas tank on MY TRUCK.

 

Oh ok.. thank you for helping me

 

That is why I asked why are you trying to put a bigger tank? And gave helpful info to put a transfer tank. Unless your truck already is the configuration of the one that has the larger tank, a larger probably won't fit due to where they are mounted on these trucks. They are tucked into areas where there isn't extra room.

People get so butthurt these days.... jeez

 

People make too many rude comments these days too..........

 

some snowflakes get butthurt too easily as well

sometimes the truth hurts

I'm not worried about it

 

Snowflake?? I got your snowflake right here what’s your address so I can bring it to you.

 

Quit while you are ahead..........