4 INSTALLATION INSTRUCTIONS
FUEL
FILTER
FUEL TANK
FUEL
PUMP
IT IS RECOMMENDED TO MOUNT
THE FUEL PUMP IN THE TANK
WHENEVER POSSIBLE. IF IT MUST
BE MOUNTED EXTERNALLY
THE PUMP WITHIN 2-FEET OF THE
FUEL TANK SENDING UNIT.
FUEL RAIL
(UNDER COVER)
FUEL RAIL
(UNDER COVER)
FUEL RAIL
(UNDER COVER)
-6 90° FITTING SUPPLIED
NOTE: IF RUNNING A RETURNLESS
FUEL SYSTEM, THE PUMP MUST
BE MOUNTED IN THE TANK.
MSD ADJUSTABLE
REGULATOR
Figure 1 Atomic LS Return Fuel System.
In-Tank Pumps
The MSD Atomic Fuel Pump (not supplied) can be used in the tank however it would require a sock, or
filter element, on the pickup side. It is important to note that the wiring used to run the pump will need
to meet requirements to be submersed in fuel. When wiring an in-tank pump, it is recommended to
use a wire that conforms to SAE specifications J1128 and J378. This wiring features a Thermoplastic
insulated wiring with polyvinyl chloride insulation for protection against gasoline, oil, and more.
In addition, different fuel line will be required internally if the pump is to be mounted in the tank. Fuel
line that meets SAE 30R10 specifications MUST be used. Failure to do so will cause severe damage
to your engine and/or fuel system.
WARNING: Improper installation or use of fuel system components can cause severe damage your
engine and/or fuel system that will not be covered by the manufacturer’s warranty.
Atomic Fuel Pump, PN 2925: This pump features 3/8” inlet and outlet. The pump will support
approximately 525 hp and is approved for in-tank use (no wiring or in-tank mounting hardware/
pickup element are supplied).
Fuel Pump Kit, PN 2920: This Kit is supplied with MSD’s PWM Fuel Pump, a pre and post-filter, 15-ft
of 3/8 fuel injection line and mounting hardware.
Fuel System Return Kit, PN 2922: If you plan on running a return line with your Atomic LS, this kit
provides another 15-ft of 3/8” injection line, an MSD Regulator and -6AN-to-hose fittings.
High Horsepower Fuel Kit, PN 2921: This pump will support the power demands of engines up to 650
horsepower. The pump features 3/8” inlet and outlet. The pump will support approximately 650
hp and is approved for in-tank use (no wiring or in-tank mounting hardware/sock are supplied).
WARNING: MSD's hose ttings are designed for use with MSD fuel hose only. Do not use the MSD
fuel hose with other fittings. Do not use MSD fittings with other fuel hose. Compatibility
issues may cause fuel leaks.
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