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The 2001 Ford Focus runs on regular unleaded.
http://myfordfocus.com/how-to/fuelfilter.htm this will show you the fuel system.. fuel pump is inside the tank how to no if my fuel punp goimg out on 2001 ford focus
In the fuel tank!
With a fuel pressure gauge attached to the fuel rail.
Check the fuel pressure on the Focus wagon as well as the EGR valve. If the fuel pressure is low or the valve is clogged then the car could have these problems.
In the fuel tank.
According to the 2001 Ford Focus owners manual : ( 50 liters / 13.2 U.S. gallons )
About 4-6 Lbs.
Change the fuel filter.
inside the gas tank
Drop the gas tank.
not on the 2001 1.4 models anyway!!