Monthly Archives: January 2021

We all see much discussion on the TDR web forums and in the TDR publications regarding performance/drivability issues, which are often traced to a low pressure fuel delivery problem. Although the narrative that follows is specific to the 12-valve Turbo Diesel trucks, model year ’94 to early ‘98 (pre 24-valve engine), the discussion on the components from the fuel tank (float and sending unit) to the fuel transfer pump apply to all Second Generation trucks.

The term low pressure fuel delivery system covers the components from the fuel tank up to the truck’s fuel injection pump and from the injection pump back to the fuel tank. Common problems that will be discussed:

• Fuel level sending unit
• Fuel heating element
• Fuel transfer pump
• Overflow valve
• Fuel return line

Let’s start at the