Either 17 , 18 , or 19 U.S. gallon
The 2003 Ford F150 has a fuel tank capacity of 25 gallons.
the tank capacity on ford f 150 v6 is 25 gallons
(short wheel base ) 16.5 (long wheel base) 19
27 gal.
I believe it is 19 gallons ( U.S. ) front tank on your 1987 F150 long bed
The front tank is the main tank and the rear tank is the auxiliary tank.
Long wheelbase: front tank = 19.0 gal. rear tank = 18.2 gal. total = 37.2 gal. Short wheelbase: front tank = 16.5 gal. rear tank = 18.2 gal. total = 34.7 gal.
Rear tank could be 18 or 19 gallon capacity.Side tank could be 16 or 19 gallon capacity.
The typical fuel capacity of a 1984 Ford F150 truck is large. It is typically around 16 or 18 gallons.
SWITCH UP= FRONT TANK
On a 1988 Ford F-150 : ( I BELIEVE the front tank holds 19 U.S. gallons )
I have a 1994 XLT xtended cab...with two tanks, each can hold 16gals.