I have been letting my main tank go without filling in order to empty it for removal. It is down to 25 gallons and the pickup must be loosing contact with the oil. I can't get the new tank setup completed for a week or so, and want hot water in the meantime. I took the fuel line off the burner and put another on with a flexible hose 6 ft in length. I filled a 5 gallon container and dropped the flexible hose into it and fired the burner. Ran fine and drew with no issues. Problem is the consumption is off the charts. I watched 3 gallons burn away in 15 minutes. Seems excessive, very excessive. I ran a screw into the hose to reduce flow and it improved the rate, but I can still watch as the level in the tank drops. Am I doing something wrong? Is there a jet of sorts on the pickup?