Owners manual

4 INSTALLATION INSTRUCTIONS
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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naltorqueof25-28*in-lb.
o Stage 1 Torque: 10 in-lb
o Stage 2 Torque: 20 in-lb
o Stage3(nal)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.