Do I need a fuel pressure damper with the MSD Atomic EFI throttle body?

Only if you run a returnless (Pulse Width Modulated) fuel system; the damper may alleviate part-throttle hesitation and mid-range sluggishness. It is not required on return-style systems equipped with a regulator.

Which fuel pressure dampers does MSD recommend for the Atomic EFI Throttle Body?

Airtex/Wells 3G1066, Airtex/Wells 3G1054, BWD/Standard Motor Products FD450, and BWD/Standard Motor Products FD462. The damper itself is not supplied.

What torque is used on the adapter fitting when installing the damper?

While holding the damper with a 7/8-inch wrench, torque the adapter fitting with an 11/16-inch socket and torque wrench to 150-175 inch-pounds (12-15 foot-pounds).

What parts are needed to add the damper to the Atomic throttle body?

The HDW31053 O-ring, MSD32095 adapter fitting, WAS32185 crush washer, and a damper (not supplied). The assembly screws into one of the -6AN ports on the throttle body.

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MSD Atomic Throttle Body PN 2910 Fuel Pressure Damper Install Addendum

MSD Atomic EFI throttle body PN 2910 fuel pressure damper installation addendum FRM32285

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MSD Atomic EFI throttle body (PN 2910) addendum: fuel pressure damper install steps for returnless PWM systems, torque adapter fitting to 150-175 in-lb, with recommended Airtex/Wells and BWD dampers.

AI caption February 2016 · Photo 495 of 828

This document is an official MSD addendum (form FRM32285, created 02/14, © 2014 MSD LLC) for the MSD Atomic Throttle Body, PN 2910. It explains that when the Atomic EFI is run with a returnless (Pulse Width Modulated) fuel system, installing a fuel pressure damper may cure part-throttle hesitation and mid-range sluggishness that cannot be tuned out with the Handheld Monitor; a damper is not required on return-style systems that use a regulator. Figure 1 identifies the required parts: HDW31053 O-ring, MSD32095 adapter fitting, WAS32185 crush washer, and a damper (not supplied). A table lists recommended dampers: Airtex/Wells 3G1066 and 3G1054, and BWD/Standard Motor Products FD450 and FD462. Five installation steps follow: install the O-ring on the adapter fitting without damaging it; place the crush washer between the fitting and damper so it engages the centering shoulder; hold the damper with a 7/8-inch wrench while torquing the adapter fitting with an 11/16-inch socket to 150-175 inch-pounds (12-15 foot-pounds); oil the O-ring and thread the assembly into a -6AN port on the throttle body; then snug it and perform at least two key-on/key-off cycles while checking for leaks. A note stresses the O-ring seals the port, so excessive torque is unnecessary. MSD contact info (phone/fax/website) is printed at the bottom.

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Frequently asked questions

Do I need a fuel pressure damper with the MSD Atomic EFI throttle body?: Only if you run a returnless (Pulse Width Modulated) fuel system; the damper may alleviate part-throttle hesitation and mid-range sluggishness. It is not required on return-style systems equipped with a regulator.
Which fuel pressure dampers does MSD recommend for the Atomic EFI Throttle Body?: Airtex/Wells 3G1066, Airtex/Wells 3G1054, BWD/Standard Motor Products FD450, and BWD/Standard Motor Products FD462. The damper itself is not supplied.
What torque is used on the adapter fitting when installing the damper?: While holding the damper with a 7/8-inch wrench, torque the adapter fitting with an 11/16-inch socket and torque wrench to 150-175 inch-pounds (12-15 foot-pounds).
What parts are needed to add the damper to the Atomic throttle body?: The HDW31053 O-ring, MSD32095 adapter fitting, WAS32185 crush washer, and a damper (not supplied). The assembly screws into one of the -6AN ports on the throttle body.
How do I check the damper installation for leaks?: Snug the assembly against the throttle body and perform at least two key on / key off cycles while checking for leaks. The O-ring provides the seal, so excessive torque is not needed.