OBS F-Series: Replacing 7.3 IDI 2pc Fuel Filter with a 1pc Filter

Introduction

In this tutorial, we will guide you through the process of replacing the leaky two-piece fuel filter setup on a 7.3 IDI engine with a more efficient one-piece filter. This upgrade not only minimizes the risk of leaks but also enhances engine performance, offering a snappier throttle response and smoother idle.

Step 1: Gather Necessary Tools and Materials

Before starting the replacement, ensure you have the following items ready:

• CarQuest #86417 or WIX #33417 one-piece fuel filter
• Pliers or an oil filter wrench
• A container for catching fuel spills
• Diesel fuel for priming the new filter
• Ether or cleaning agent for cleaning spills
• Rubber gloves for protection

Step 2: Remove the Old Fuel Filter

1. Disconnect the Hose: Start by disconnecting the rubber hose attached to the old filter.
2. Remove the Drain Cap: Rotate the drain cap clockwise to loosen it, and then remove it completely.
3. Inspect the Old Filter: Look inside the filter for debris and sediment that may have accumulated.
4. Remove the Filter: Use pliers or an oil filter wrench to grip the old filter firmly, as it may be stuck. Twist and pull until it comes off.

Step 3: Prepare the New Filter

1. Check the New Filter: Ensure that the new filter has a drain valve at the bottom and that the barb is not connected during normal operation.
2. Fill the Filter with Diesel: Pour diesel into the new filter until it is full. This helps eliminate air when starting the engine.
3. Lubricate the O-Ring: Apply a small amount of diesel to the O-ring on the new filter to ensure a proper seal.

Step 4: Install the New Filter

1. Attach the New Filter: Align the new filter with the fuel line and screw it on carefully, ensuring the rubber piece with fingers is pushed up to help grip the filter.
2. Tighten Securely: Make sure the filter is securely fastened without over-tightening.

Step 5: Clean Up and Start the Engine

1. Clean Any Spills: Use ether or a cleaning agent to wipe off any diesel that may have spilled onto the engine.
2. Start the Engine: Crank the engine. It may sputter initially as air works its way out of the new filter.
3. Monitor Performance: Once started, check for leaks around the new filter and listen for any unusual noises. The engine should sound smoother and more responsive.

Conclusion

Replacing the fuel filter on your 7.3 IDI engine with a one-piece filter can greatly improve performance and reduce the likelihood of leaks. Remember to always keep an eye on the installation area for any potential leaks after the replacement. If you experience any issues or need further assistance, consider consulting with a professional mechanic. Happy driving!