65 Mustang Evil Energy Fuel filter and shutoff install
This video shows installing an Evil Energy inline fuel filter and an integrated fuel shutoff valve on a 1965 Ford Mustang. The build covers selecting a mounting location, routing and cutting the fuel line, installing fittings/clamps/bracket, and testing for leaks and proper operation of the shutoff.
Build Sequence
1. Preparation and safety
Park on level ground, work in a well-ventilated area, have a fire extinguisher ready. Disconnect the battery to eliminate ignition sources. Put down a catch pan and rags to catch any fuel drips.
2. Select mounting location and plan routing
Choose a solid location on the chassis or firewall to mount the filter and shutoff where it is accessible but protected. Plan hose routing to avoid heat sources, sharp edges, and moving parts.
3. Relieve fuel system and isolate fuel flow
Relieve fuel pressure if applicable (for classics this may mean turning off fuel and running engine until it dies, or clamping the hose). Place catch pan under lines before cutting or loosening any connections.
4. Cut and prepare fuel line
Measure and cut the fuel hose at the planned location. Deburr cut ends and slide hose clamps onto the hose before installing fittings. If using new hose, cut to length and dry-fit connections.
5. Install filter and shutoff assembly
Mount the filter bracket to the chosen location with bolts. Install any required fittings/adapters on the filter, apply PTFE tape or sealant as needed. Connect fuel lines to the filter in correct orientation and secure with hose clamps.
6. Test for leaks and operation
Reconnect battery or prime fuel system, then cycle the ignition or run the engine briefly to pressurize the lines. Check all fittings and hose ends for leaks. Operate the shutoff valve to verify it stops fuel flow and returns to open position cleanly.
7. Secure lines and final checks
Secure hoses with additional clamps or zip ties away from heat and moving parts. Re-check fasteners, clean up any spilled fuel, and dispose of rags/unused fuel properly.
Frequently Asked Questions
What sized hose and fittings do I need?
Measure your current fuel line inner diameter and use matching hose and fittings. Common sizes on classic Mustangs are 5/16" or 3/8", but verify before purchasing.
VIEW FULL ARTICLE →How do I check for leaks after installation?
After reconnecting power or priming the system, pressurize the fuel system and inspect all hose ends, clamps, and threaded fittings for signs of fuel. Operate the shutoff to ensure it stops flow; if any seepage appears, tighten clamps or re-seal fittings.
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Parts Used (6)
Used to replace cut section of hose and to connect filter to fuel lines. Match ID to carburetor/pump fittings (commonly 5/16" or 3/8").
Screw-type clamps to secure hose onto fittings; use stainless clamps for corrosion resistance.
Combination inline filter and shutoff. Primary component of the install.
Bracket to secure the filter to the chassis or firewall. May come with the filter or be fabricated.
Any necessary adapters or barb fittings to match the filter to existing fuel lines; verify thread types and sizes.
Used on threaded fittings if required to ensure a leak-free seal.