It could be either 17 U.S. gallons or 19 U.S. gallons depending on model
I believe it is 19 gallons ( U.S. ) front tank on your 1987 F150 long bed
SWITCH UP= FRONT TANK
The front tank is the main tank and the rear tank is the auxiliary tank.
i believe its a 20 gallon gas tank.
On a 1992 F150 , www.motorcraft.com lists 3 sizes of front fuel tank : a 19 gallon ( U.S. ) steel tank / and a 17 or 18 gallon plastic tank but it doesn't get any more specific
1989 Frod F150
Look in your owner's manual. front tanks are usually around 50 liters, rear tanks are usually bigger around 65 liters. That's 35 gallons, for all of U.S. drivers. :-)
Is it stuck in rear or front?? Same thing happen to my 89 f150......Front tank was shot...You need to have it looked at
Either 17 , 18 , or 19 U.S. gallon
may be from the fuel pump access
If your wondering why you get better fuel economy in the front tank is because it is an over flow tank. That mean when your running on the rear tank your are actually dumping fuel into the front tank when ever you hit your breaks hard and the engine also returns fuel to the front tank that isn't needed from the rear. that is why you get better millage on the front tank and worse on the rear tank.
33 Gallons