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oil separator working is separat oil & gas
Yes.
The separator is valve handle is on the firewall side of the fuel canister
As much as it takes. You could talking about anything from a Freightliner Sprinter up to a heavy haul truck.
Need to know what engine you have in order to answer this. In 2003, Freightliner had the option of Detroit, Cummins, Caterpillar, and Mercedes-Benz diesel engines.
Underneath the drive side driver seat.
on the firewall next to the brake master cylinder
You need to have it drained out.
11 gallons with filter
Depends on the engine in the Freightliner truck. Some require as little as 2 gallons, others require 11 gallons.
Whatever size the original purchaser ordered with it.
Assuming you're referring to the RWD Fleetwood, it could have either a 4.1L V6, 4.1L V8 or a 5.7L diesel V8