S-Max Fuel Pressure Regulator Step by Step Install

Step 1: Disconnect the battery and relieve the fuel pressure.

Step 2: Remove the fuel injector wiring harness clips, two 10mm grounding bolts, knock sensor and IACV sensor plugs

Step 3: Remove fuel feed and return lines off the manifold.

Step 4: The stock regulator is held in place with two Phillips head screws (be careful not to strip them).  Gently pry out the regulator and disconnect the vacuum line.  Have a rag handy to soak up any fuel that is left in the system and plug the fuel line to prevent additional discharge.

Step 5: Remove the three 12mm bolts and black spacers that hold the fuel rail in place.  Also remove the three 10mm bolts that hold the feed line to the manifold.

Step 6: Remove the entire fuel rail.

Step 7: Remove the existing black rubber grommets and oil the new o rings before installing the new grommets.

Step 8: Oil the fuel injector o rings and install the fuel injectors into the new rail.

Step 9: Install new rail with the supplied hardware.   Replace the top two 10mm bolts that held the feed line to the manifold.

Step 10: Find a suitable place to mount your fuel pressure regulator.

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For plumbing we used -6 AN fittings and push lock hose.

Step 13: Connect the fuel feed to the open end of the rail and the return of the regulator back to the car’s factory line.  Careful don’t reverse the hookups.

Step 14: Cut the clips from the old harness and connect the power and ground wires for the new pigtail to the old harness.  We did not use the crimp connectors that where supplied, we soldered instead.

Step 15: Tighten all fittings and connections, reconnect the two 10mm grounding bolts. the knock sensor and IACV sensor plugs .

Step 16: Reconnect the battery, turn the fuel pump on and check for leaks