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The '86 and '87 (and maybe some '88's) had two pumps: a low pressure "lift pump" inside the gas tank feeding a high pressure pump on mounted to the frame rail.
'88 on up used a single high pressure pump in the gas tank.
Then, assuming it's still the factory set up, you have two pumps: low pressure in the tank and an in line high pressure pump on the driver's frame rail.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.