This should be done daily, as condensation and contaminated matter could be present.
You are supposed to drain your tanks daily, especially if your truck has only two tanks, and doesn't have a wet tank.
If you mean how do you FIX it, then drain all the gasoline out of the tanks. Disconnect the fuel lines and blow out all gas from the lines. In other words remove all gasoline from every component on the truck.
Box type delivery truck? The one I drive has 2-fifty gallon fuel tanks
Under the door on the left side of the vehicle (I don't say "driver side" because Volvo does offer RHD models for parts of the world where that's the norm, and I don't know where you're posting from) is where the air tanks should be. The supply (wet) tank has a pull cord attached to it. Pull on it, and it'll drain the air out.
The capacity of a gas tank will vary according to the truck. Regular size pick ups have a tank that is approximately 20 gallons, whereas a semi truck can have tanks that hold up to 150 gallons.
No.
In England, people typically refer to a truck as a "lorry."
On a lot of the VHD and VNL series (and it should be the same on the NH/FH/FM series, there's three air tanks under the door on the left side of the vehicle.. the first one should have a cable you can pull to drain the primary (wet) tank.
On the ground if you've taken them by truck. Never fill them when they are in the bed of a truck.
Truck Works Inc. truckworksinc.c
If it has an automatic transmition there is no drain plug, you remove the pan to drain it.
There is no drain plug . you will need to remove the trans. pan to drain fluid.