Atomic EFI
DANGER
DANGER
CAUTION
WARNING
NOTICE
DANGER
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
DANGER
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
INSTALLATION INSTRUCTIONS 3
DANGER
CAUTION
WARNING
NOTICE
FUEL TANK
FUEL
PUMP
MSD ADJUSTABLE
REGULATOR
POST
FUEL
FILTER
PRE FUEL
FILTER
RETURN STYLE FUEL SYSTEM
If you have decided that a returnless fuel system will not produce the best performance for your
application, you will need to route a return line in the fuel system. There are many aftermarket fuel
regulators available. The fuel can then be routed to the sending unit of the gas tank, or even the filling
port of the tank. This will take modification. Figure 2 shows an example of a return style fuel system.
The most efficient system is to return the fuel from the opposite outlet of the throttle body.
The fuel pressure required for a return fuel system is approximately 45psi. If the pressure is not enough
the injectors will be over-worked and an “INJ DC” code will appear in the Diagnostics on the Handheld.
If this happens increase the fuel pressure by 5 PSI increment and test again. A rule of thumb is to start
at approximately 60 psi for engines over 400 horsepower.
With a return style system you must connect the fuel lines as pictured below. Connecting them
like in the lower picture can cause fluid hammer inside of the throttle body on transient operations. This
will cause hesitatons and possibly dead zones at certain RPM ranges.
CORRECT FOR RETURN STYLE FUEL SYSTEM.
POST
FUEL
FILTER
MSD ADJUSTABLE
REGULATOR
NOTE: Do not use tubing (hard fuel lines) with the Atomic EFI system.
INCORRECT
AFTERMARKET
ADJUSTABLE
REGULATOR
FUEL
PUMP
FUEL
PUMP
PRE FUEL
FILTER
PRE FUEL
FILTER
FUEL TANK
FUEL TANK
Figure 2 Atomic Return Style Fuel System.
MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344
4 INSTALLATION INSTRUCTIONS
The MSD Customer Support phone lines are available 7am-5pm Mountain Standard Time Monday
through Friday to answer any technical questions you may have in regards to installing the Atomic
EFI or other MSD parts (915) 855-7123.
TECH NOTES
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Service
In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty.
When returning MSD components for warranty service, Proof of Purchase must be supplied for verification. After
the warranty period has expired, repair service is based on a minimum and maximum fee.
All returns must have a Return Material Authorization (RMA) number issued to them before
being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit
our website at www.msdperformance.com/rma to automatically obtain a number and shipping information.
When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include
a detailed account of any problems experienced, and what components and accessories are installed on the vehicle.
The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered
by warranty). For more information, call MSD at (915) 855-7123. MSD technicians are available from 7:00 a.m. to
5:00 p.m. Monday - Friday (mountain time).
Limited Warranty
M
SD warrants this product to be free from defects in material and workmanship under its intended normal use*,
when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of
the original purchase. This warranty is void for any products purchased through auction websites. If found to be
defective as mentioned above, it will be repaired or replaced at the option of MSD. Any item that is covered under
this warranty will be returned free of charge using Ground shipping methods.
This shall constitute the sole remedy of the purchaser and the sole liability of MSD. To the extent permitted by
law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied,
including any implied warranty of merchantability or fitness. In no event shall MSD or its suppliers be liable for special
or consequential damages.
*Intended normal use means that this item is being used as was originally intended and for the original application
as sold by MSD. Any modifications to this item or if it is used on an application other than what MSD markets the
product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work for
the application they are intending. MSD will accept no liability for custom applications.
MSD • WWW.MSDPERFORMANCE.COM • (915) 855-7123 • FAX (915) 857-3344
© 2013 MSD LLC
FRM 31396 Revised 12/13 Printed in U.S.A.
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