Conversation so far:
where is the fuel pump located in a car
In modern cars the fuel pump is located inside the fuel tank.
what does a fuel pump do
The fuel pump creates positive pressure in the fuel lines, pushing the gasoline to the engine.
is a fuel pump necessary
A fuel pump is a frequently (but not always) essential component on a car or other internal combustion engined device.

Question: which vehicles do not have the pump
Self-contained rewrite: which vehicles do not have the fuel pump