Yes, the Jaguar XK8 does have a fuel pump.
Fuel_pump_relay_location_for_a_jaguar_xk8
how to change a fuel pump in a 1998 Chevy Corvette
In the trunk number 4relay
The electric fuel pump is inside the fuel tank
If your Jaguar is fuel injected the fuel pump is located on top and inside the fuel tank. If it has a carburetor it may be an in-line electric pump or the pump might be mounted on the side of the engine block. Follow the fuel lines from the fuel tank and you will find the pump.
In the fuel tank,
location of fuel pump relay
in the tank
Fuel Pump Location is in the front of the Spare Tire well, under a cover panel, sort of tucked toward the rear bumber.
fuse box
its part of your fuel pump in the tank