How to Remove the Fuel Return Line on a 7.3 Powerstrokeby Gregory Crews
Removing the fuel return line in a 7.3-liter Powerstroke engine is a straightforward process. The fuel return line is used to redistribute excess fuel back to the fuel tank. The fuel return hose starts at the fuel filter and can be traced to the valve that combines the fuel lines from both of the fuel tanks. Removing the line will only take a few minutes to complete.
Ensure the truck is parked on a flat and level surface. Take the keys out of the ignition.
Open the hood for access to the engine compartment. Locate the fuel filter housing bowl. The fuel return line is located at the back of the fuel filter housing.
Locate the Schrader valve along the fuel line. The Schrader valve will look like an air valve that goes on a tire. It is located just behind the fuel filter bowl. Unscrew the cap on top and press the tab on the top of the valve with a flat tip screwdriver. Keep a rag under the valve to catch any excess fuel. This will depressurize the fuel system.
Unscrew the fuel return line with a line wrench. Trace the fuel return line to under the truck. Remove the fuel line from the clips.
Unscrew the other end of the fuel return line with a line wrench. Pull the line down. Take the fuel line away from the truck.
- Use caution working around the fuel system. Diesel fuel is highly toxic if ingested.
Items you will need
- Flat tip screwdriver
- Line wrench kit
- "Ford Pick-ups, Expedition and Lincoln Navigator Haynes Repair Manual covering 2WD and 4WD gasoline models for F-150 (1997 thru 2003), F-150 Heritage (2004), F-250 (1997 thru 1999), Expedition (1997 thru 2009), and Lincoln Navigator (1998 thru 2009)"; John Haynes; 2009