All of our equipment will come to you with a full tank of fuel and it has to come back to us with a full tank of fuel. However if we are delivering it and picking it up from you it might not make sense for you to fill it up with one 5 gallon jug of diesel at a time. So after picking it up we will stop and fuel it up on our way back and we will tack that amount on to your total bill. We do not up charge the fuel, the price at the pump is the price we tack on to your bill.