Was thinking it was around 38 gallons but I'm thinking it's less than that. I have a 1999 Super Duty V10 with the long bed.

 

Options were either 25, 30 or 38.

 

I thought the long beds got 39 and the sb's got 28

 

How do you find out for sure what size tank it is?

 

Long beds have a 38 gallon tank. Short beds have a 29 gallon tank.

Both are known to actually hold more than their supposed max capacities. There've been several threads over the years where numerous folks have posted about putting 40 gallons in the 38-gal tanks, or 32 gallons in their 29-gal tank, etc.

 

Drive it until the gas light comes on, then fill the tank up

If you're poor (like me), fill it up from half-tank and double the gallons used

 

Exactly!

And the F350-F550 Chassis Cabs came with 40 gallon

 

don't do that with a diesel. at least not to a dry empty i mean.

 

Which ever tank you have, it isn't big enough.

 

Thats for sure!!!

 

Sorry if I was wrong but I just searched the spec page here on FTE for the info.

 

the most ive ever put in mine was 27, and thats well after the light came on

 

I put 27 in my 29 gallon tank this morning. Nothing like $80 to wake you up on a Monday morning.

 

I've put 42.8 in my 01 long bed!

 

I just put 32 gals in my crewcab shortbed today! computer was showing 16 miles to empty.

I have done the harpoon mod so the nozzle clicked off the first time at 31 gals, then 3 more quick clicks to get to 32 gals.