MSD 2957 Atomic LS Master Early Truck Kit (GEN III 1999-2007) Installation - Manual (Page 10)

10 INSTALLATION INSTRUCTIONS
M S D
• W W W . M S D P E R F O R M A N C E . 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 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
the engine combination, the Atomic LS requires a minimum of 58-62 psi continuous to operate. When
selecting a pump, regulator and lines, be sure each component is designed to perform at high pressure.
MSD offers fuel pumps, fuel hose and accessories to complete the installation. The following guidelines
are intended to help set up a fuel system for the Atomic LS. 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 fittings for the fuel rails. These fittings 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.
Mounting low to 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 does not
recommend the use of a hard line for the fuel system in PWM mode.
Note: Ensure Fuel Pump is PWM capable.
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
OPT
OPT
OPT
OPT
OPT
REQ
OPT
REQ
REQ
REQ
REQ
REQ
REQ
REQ
OPT
Function
Battery 1, Must be connected to Positive (+) Battery terminal.
Ground, Connect to solid, clean engine ground.
Pump, Connect to Fuel Pump Positive terminal.
Battery 2,
Must be connected to Positive (+) Battery terminal.
Fan 1, Supplies ground to activate Fan 1
2 Step Connect to switched 12V to activate.
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-
W
ay
CONNECTOR
G
T Series 16 W
ay
This wire functions as a Malfunction Indicator
Lamp (MIL). This wire will provide a ground
in the event of a diagnostic code.