Fuelab 40401 Reduced Size EFI In-Line Fuel Pump - Manual (Page 2)

Typical EFI V-8 Fuel System Plumbing Schematic Diagram:
110020275-1, Rev A Page 2 of 6
An electronic gauge or pressure transducer system is recommended for readings in a passenger compartment.
Do not "Dead Head" Fuel Pump.
Special Note: Use in carbureted systems require a bypass return or relief valve.
Fuel Pump may be mounted inside a fuel tank or cell, inlet screen strainer is still required. Adequate structural
mounting and support is the responsibility of the fabricator and installer. Mount the fuel pump as low as possible
without it being vulnerable to road hazards or debris. Minimize the length of the fuel line feeding fuel pump. Do not
use “cross drilled” style 90° elbow fittings, check valves or other restrictions (other than high flow fuel filter strainer
or shut-off valve) before or upstream of fuel pump. Minimize plumbing restrictions between fuel tank and fuel pump
and regulator for peak performance, use -8AN (1/2”) to -10AN (5/8”) line as required per flow rate requirements of
the vehicle’s engine and fuel pump speed setting. Typically -6AN (3/8”) to -8AN (1/2”) line is required for the rest
of the fuel system, after or upstream of fuel pump. Use of a strainer filter upstream of fuel pump is required to
protect fuel pump from damage. All fuel line used must handle high pressure. The use of fuel line such as stainless
steel braided line and “AN” style fitting connections is recommended. The fuel ports (one -10AN Inlet Port and one
-10AN Outlet Port) use “AN” or “military” style fittings. This plumbing standard is commonly used with racing and
high performance applications. See step 4 on page 5 for additional information on this port standard. A fuel filter
with a 60 micron or lower particle rating is required to be used upstream of regulator and downstream from fuel
pump to protect it and the fuel injectors from foreign object damage. Reference the Schematic Diagram below for
filter locations. Fuel tank must have a modification of an additional sump, or use aftermarket fuel cell as indicated.
Use of a “pick-up” tube system is not recommended. Use of a liquid filled gauge exposed to engine compartment
heat is not recommended as the liquid inside the gauge may exert measurement errors, all mechanical gauges and
pressure transducers have amounts of error due to temperature fluctuation, be aware of inaccurate pressure
readings. DO NOT plumb gauge port to any gauge mounted inside the vehicle or in passenger compartment. A
line burst can spill fuel inside passenger compartment and on occupants, possibly causing serious injury or death.
Plumbing Planning Notes:
EFI Regulator
To Engine Intake Manifold (Air)
Fuel Gauge Shown in
Gauge Port, Liquid Filled
Gauge may have Error Due
to Temperature Variations.
Y-Block or "T" Fitting,
to Split Flow into Two
Fuel Rail System
Fuel Straining Filter Required, Typical
Micron Rating: 75-150, Fuelab 818xx
Series 75 Micron Filter Recommended.
-8AN or 1/2" Miniumum
Line Size Required to feed Straining
Fuel Filter and Fuel Pump.
Vented Fuel Cell or Fuel Tank.
Tank must be Plumbed According
to Maximum Pump Flow Rate.
Follow Fuel Cell Manufacturer's
Recommendations for Proper
Cell Vent Plumbing
Fuel Filter with 60 Micron or
Lower Particle Rating is Required.
Fuelab Filter with 6, 10 or 40
Micron Rating is Recommended.
Check Valve Required for Reduced
Vehicle Emissions and Improved
Engine Starting. Fuelab 848xx Series
Filter has Check Valve Assembly
Built in.
(2X) Fuel Rails
with Injectors
40401-c (-sp) Fuel Pump