MSD 2920 Installation

Atomic EFI

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CAUTION

WARNING

NOTICE

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PN 2920 - Fuel Pump Kit, 525 HP

WARNING

modifications must be carried out by a qualified automotive technician. Installation of fuel system
parts requires handling of gasoline. Ensure that work is performed in a well ventilated area with an
approved fire extinguisher nearby. Extinguish all open flames, prohibit smoking and eliminate all
sources of ignition in the area of the vehicle before beginning the installation.

When working with fuel systems, eye goggles and other safety apparel should be worn to protect
against debris and sprayed gasoline. The finished work must be thoroughly checked to ensure
there are no fuel leaks.

Parts Included:

1 - Fuel Pump
1 - Small Parts Bag (screws, nuts & washers)
2 - Fuel Pump Clamps
1 - Pre Filter (pre pump)
1 - Post Filter (post pump)
15 ft 3/8" Fuel Line

WARNING

The Fuel Pump Kit, PN 2920, contains all the components necessary to set up a returnless fuel system
for the Atomic EFI. This means that a return line to the fuel tank is not required, which simplifies the
fuel system installation. This kit can also be used with the MSD PN 2922 return kit, if a return line to the
tank is needed.

A Returnless fuel system does have limitations depending on your application and a few other

variables. Please see the included addendum for determining whether a returnless system is right for you.

Installation of this product requires detailed knowledge of automotive systems
and repair procedures. Installation of fuel system parts and any fuel tank

Parts Bag:

1 - Clamp, Pre-filter
1 - Clamp, Post-filter
7 - Clamps, Fuel Line
2 - Self Tapping Screws
2 - Fitting, 6AN, 90°
2 ft. Black Wire
1 - 14g Ring Lug

The fuel system is under pressure. Do not open the fuel system until the pressure
has been relieved. Refer to the appropriate vehicle service manual for the
procedure and precautions for relieving the fuel system pressure.

INSTALLING THE RETURNLESS FUEL SYSTEM

CORRECT RETURNLESS (PWM) INSTALLATION

PRE FUEL

FILTER

FUEL TANK

POST
FUEL

FILTER

Figure 1 Atomic Returnless Fuel System.

MSD •  WWW.ATOMICEFI.COM  •  (915)  855-7123  •  FAX  (915)  857-3344

FUEL

PUMP

NOTE: Hard fuel lines are NOT recommended

for use with the returnless fuel system.

2 INSTALLATION INSTRUCTIONS

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INSTALLING THE FUEL PUMP

The Fuel Pump, PN 2920, is designed to support engines up to 525hp. The pump specifications will
support the volume and pressure required when being used with a returnless or return style fuel system.

1. It is recommended to mount the pump close to the gas tank and in a position that is below the lowest
point of the tank.

2. Before mounting the pump, it is recommended to install the ground wire to the negative terminal and
the orange wire from the Atomic to the positive terminal with the hardware supplied in the small parts
bag. Connect the ground wire to a clean, bare metal ground source.

3. Connect the fuel line to the pump and secure with a small fuel line clamps, and then mount the pump
with the supplied clamps and self drilling screws.

4. Install the fuel filters. Find a suitable location for the supplied fuel filters and use the supplied clamps and
self drilling screws to secure them to their mounting locations. The small filter is the pre-filter and needs
to be mounted between the fuel tank and the fuel pump. The large filter is the post filter and needs to
be mounted between the fuel pump and the throttle body. Both filters and the pump incorporate 3/8"
beaded inlet/outlets. Note: Many carbureted fuel tanks have a 5/16" diameter supply line. The Atomic
EFI requires a 3/8" diameter supply line. Fuel line size mismatching will cause fuel vapor lock, even if the
vehicle qualifies for returnless using the points system(described (described in PN 2910 instructions.

5. Connect the supplied fuel hose from the pump to the filter using the supplied clamps.

6. Determine if the fuel line is going to be routed to the front or rear port on the throttle body. Route the
hose to the inlet port making sure to secure it to the frame and away from heat sources and suspen­sion components.

7. Install the 3/8" hose to the inlet of the Atomic throttle body using the -6 fitting supplied in the kit. It is
recommended to use dish soap to push the hose over the fitting. Make sure the line is pushed all the
way to the end of the fitting. DO NOT use a clamp on the push lock fitting.

WARNING

leak(s) before proceeding!

8. Turn the ignition to ON without starting the engine, allow the pump to run for several seconds and

check the fuel pressure. If there is no pressure, turn the ignition to OFF, wait one minute, then turn the
ignition to ON and recheck the pressure. Repeat this ignition OFF and ON procedure until the gauge
registers pressure or you detect a fuel leak. If no pressure is registered on the gauge after running the
pump for several seconds and you have found no leaks, check all fuel and electrical connections to
determine the cause.

Failure to follow the above may result in fuel leakage, bursting of the fuel lines, poor vehicle
performance and/or decreased fuel pump life! Improper installation will void all warranties for
this product!

While performing the following steps, if any fuel leaks are detected,
immediately turn the ignition to OFF, remove any spilled fuel and repair the

IN TANK MOUNT

The MSD pump 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 SAE30R10 specifications MUST be used. DO NOT use the included fuel line inside
the fuel tank. Failure to do so will cause severe damage to the engine and/or fuel system.

MSD •  WWW.MSDPERFORMANCE.COM  •  (915)  855-7123  •  FAX  (915)  857-3344