Installation Manual

10 INSTALLATION INSTRUCTIONS
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FUEL SYSTEM REQUIREMENTS
The Atomic LS fuel injection system requires a high pressure fuel pump system. The fuel system is not
supplied due to the large variety of applications incorporating the LS engine platform. Depending on
your engine combination, the Atomic LS requires a minimum of 58-62 psi to operate. When selecting a
pump, regulator and lines, be sure each component is designed to perform at high pressure. MSD offers
fuel pumps, hose and accessories to complete your installation. Following are some guidelines intended
to help set up a fuel system for your Atomic as well as components available separately from MSD. The
Atomic is capable of operating with a return or returnless style system.
•Whenrunningareturnlessfuelsystem(PulseWidthModulated)thefuelpumpmustbemountedinthe
tank. This will result in quieter operation, a reduction in pump temperature, and a less likely chance of
fuel pump cavitation.
•MSDsupplies-6ANPush-Lockstylettingsforthefuelrails.ThesettingsmustbeusedwithMSD's
high pressure EFI hose.
• Ifmountingthepumpinthetankisnotanoption,installthepumpascloseaspossibletothetank.
Within 2-feet of sending unit is recommended. MSD recommends the Atomic Fuel Pump, PN 2925 or
PN 2926.
•WhenusingaPWMfuelsystem,pulsationsandharmonicscouldcauseunstablefuelpressurethatcan
result in fuel pump cavitation or poor engine performance. For this reason MSD recommends not to
use a hard line for the fuel system in PWM mode.
Power Module
Pin
1
2
3
4
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
Color
Red
Black
Orange
Red
Red
Blue
Bro/Wht
Brown
Lt Blue
Gray
Red
Orange
Red
Red
Yellow
Blk/Wht
Blk/Red
Green
Black
Lt Green
Use
REQ
REQ
REQ
REQ
OPT
N/A
OPT
OPT
OPT
OPT
REQ
OPT
REQ
REQ
REQ
REQ
REQ
REQ
REQ
OPT
Function
Battery 1, Connect to Positive Battery terminal. Must be connected.
Ground, Connect to solid, clean engine ground.
Pump, Connect to Fuel Pump Positive terminal.
Battery 2, Connect to Battery Positive terminal. Must be connected.
Fan 1, Supplies ground to activate Fan 1
Reserve for later use.
Nitrous, When supplied with 12 volts, timing will be retarded and the
air/fuel ratio will be corrected to the target nitrous setting.
Speed Ref. (-)
Speed Signal (+)
Tach, Supplies 12V square wave signal
Switched 12V, Connect to ignition switch
Fan 2, Supplies ground to activate Fan 2 at desired temperature.
Supplies power to the Fuel Rail
IP
VM
H-
H+
IA
UN
WBO2
MIL Ground
CONNECTOR
Deutsch
4-Way
CONNECTOR
GT Series 16 Way
This wire functions as a Malfunction Indicator
Lamp (MIL). This wire will provide a ground in the
event of a diagnostic code. Connect the (MIL) to
the ground side of a light bulb or LED. Connect
the other side of the light blub or LED to 12v.