MSD 2957 Atomic LS Master Early Truck Kit (GEN III 1999-2007) Installation - Manual (Page 11)

INSTALLATION INSTRUCTIONS 11
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• W W W . A T O M I C E F I . C O M • ( 9 1 5 ) 8 5 5 - 7 1 2 3 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
FUEL SYSTEM INSTALLATION
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, MOUNT
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 22 Fuel Line Routing.
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 of the pump. 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 two push-lock 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).
FUEL INLET FITTINGS AND CROSS-OVER LINE
LS engines require a cross-over fuel line to
route the fuel from one bank to the other. This is
typically done at the front of the engine (Figure
23). Due to the variety of intake manifolds and
accessories a cross-over line must be made for
each application.
Figure 23 Installing Fuel Hose to the Push-Lock Fittings.