[JRTJH]

There is some "speculation" going on among some posts here. Ford does not cover the LPFP (conditioning unit with water/fuel separator) in the extended warranty (past 36000 miles) but they do cover the HPFP and its associated fuel lines, injectors, etc. Here's the direct quote from Ford's 2015 warranty guide: Related to the fuel pumps, the parts in red are NOT covered, the parts in green ARE covered.

(4) Your vehicle’s direct injection diesel engine and certain engine
components are covered during the PowerStroke Diesel Engine Coverage
Period, which lasts for five years or 100,000 miles, whichever occurs
first. The following parts are covered during this extended coverage
period: the engine, cylinder block, heads and all internal parts, intake
and exhaust manifolds, timing gear, harmonic balancer, valve covers, oil
pan and pump, water pump, fuel system (excluding fuel lines, fuel tank
and frame mounted fuel conditioning module sometimes referred to as
the frame mounted pump/filter/water separator or frame mounted fuel
filter/water separator), high pressure lines, gaskets and seals, glow plugs, turbocharger, two-stage turbocharger assembly, turbocharger actuator, powertrain control module, high pressure fuel injection pump assembly, injectors, injection pressure sensor, fuel rail pressure sensor, exhaust back pressure regulator and sensor, exhaust pressure sensor, manifold
pressure sensor, intake air temperature sensor, crankshaft position
sensor, camshaft position sensor, accelerator switch.

NOTE: Some components may also be covered by the Emissions
Warranties. For more information, see pages 17-31.