Yes.
The 2002 Ford Focus runs on regular unleaded.
Yes
Drop the fuel tank!
In the gas tank.
On a 2002 Ford Focus : In the front passenger footwell , behind the kick panel ( there is an access hole )
13.2 gallons
IN the gas tank.
With a fuel pressure gauge attached to the fuel rail.
Enter at your own risk!
Probably under vehicle - follow fuel line from tank
were is the Schrader vale located
Fuel pump... yes. OIL pump... NO!