Preparation

• 1). Fill your empty or near-empty fuel tank with biodiesel and expend the fuel with regular use. If your engine begins to perform poorly before all the fuel is expended, proceed immediately to Step 2
  
  
• 2). Stop in a safe work space and wait for your engine to cool.
  
  
• 3). Don your safety equipment, including eye protection and vinyl or rubber gloves.
  
  

Changing Your Fuel Filter

• 1). Use your open-ended wrenches and/or screwdrivers to remove all fuel lines from your fuel filter. Place a catch pan underneath this area to catch any fuel that may leak or spill.
  
  
• 2). Remove the old fuel filter. A specialized filter wrench may be necessary to facilitate removal.
  
  
• 3). Replace the old filter with a new one. "Prime" the new filter with some spare biodiesel; otherwise, the air in the filter may affect the reignition of your engine.
  
  
• 4). Reattach any and all fuel lines to the newly installed fuel filter, replacing the fuel line washers with new ones. Use a spare rag to clean the area of any excess fuel.
  
  
• 5). Properly dispose of any fuel that has been collected in the catch pan or rags.