MSD 2922 Fuel Pump Return Kit Installation - Manual (Page 4)

4 INSTALLATION INSTRUCTIONS
M S D
• W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
REGULATOR SERVICE
The regulator diaphragm assembly is available as a service kit from MSD and considered a user-
serviceable item. Detailed instructions are available in the service kit, but for completeness, the
following guidelines must be observed if it is necessary to separate the regulator housings.
• Use a 9/64-inch hex key (Allen wrench) to remove the three (3) 8-32 x 0.375 Socket Head Cap
Screws
• Use care not to lose any internal parts (particularly the ¼-inch ball beneath the adjustment screw)
• Upon re-assembly, ensure that no debris or particulates are trapped between the housing mating
surfaces (these may cut or damage the diaphragm)
• Align the diaphragm slots with the three (3) screw holes and stack the spring assembly prior to
installing the upper housing
• Install the three (3) 8-32 x 0.375 SHCS to a staged final torque of 25-28* in-lb.
o Stage 1 Torque: 10 in-lb
o Stage 2 Torque: 20 in-lb
o Stage 3 (final) Torque: 25-28* in-lb.
* Verify the Stage 3 torque after at least one hour has elapsed (to allow for diaphragm compression set)
Completing the installation of your MSD Atomic fuel return kit will require that several connections
be made using the supplied high-pressure hose and push-lock fittings. Use compressed air (or
equivalent) to ensure that all complete hose / fitting assemblies are clean prior to final installation.
To ensure that your connections are safe, durable, and cosmetically pleasing, we recommend that
you adhere to the guidelines in the following section:
STOP HERE
REVIEW YOUR INSTALLATION
Take a few extra minutes to check all aspects of your return fuel system installation at this point. Cycle
the key on and off several times to ensure a complete fuel system prime, and verify that all connections
and fittings are leak-tight. Don’t forget to make the final regulator adjustment with the engine idling.