The 1986 ford f150 has two fuel pumps. There is one pump mounted inside of each fuel tank.
1997 ford f150 fuel pressure specs
In the gas tank
With a fuel pressure gauge connected to the fuel rail.
Mounted on top and inside the fuel tank.
inside that tank, its atached to the fuel pump assembly
What is it doing
in the gas tank
92 f150 fuel shut off switch located
Most likely in the fuel tank
Probably in the fuel tank
threaded into the front of the carb. Follow the fuel line from the fuel pump to the carb.