Here's a systematic approach to finding it:
1. Trace the Fuel Line: Start at the fuel tank and follow the fuel line towards the engine. The filter will be inline somewhere along that route. This is often the most effective method. Look carefully under the chassis, along the frame rails, and near the engine.
2. Consult a Ford Shop Manual: A shop manual specific to your year, make, and model (and ideally, with the motorhome conversion noted if possible) will have diagrams showing the fuel system layout. This is more reliable than a generic owner's manual.
3. Check near the Engine: Even if not on the frame rail, the filter might be close to the engine itself, possibly tucked away in a less obvious spot.
4. Look for the Filter's Housing: The filter itself might be replaceable within a canister or housing. Look for something that looks like a cylindrical canister with fuel lines going in and out.
5. Online Forums: Search online forums dedicated to Ford F-series trucks and motorhomes from that era. Someone may have encountered the same issue and documented the location on their similar rig.
6. Professional Mechanic: If you've exhausted all other options, a mechanic specializing in older Ford trucks or motorhomes will be able to locate the filter quickly.
Important Safety Note: When working with fuel lines and the fuel system, be extremely cautious. Avoid sparks or open flames. Work in a well-ventilated area. If you're unsure about any aspect of this, it's best to seek professional help.
