(2X) Fuel Rails
with Injectors
Model 47401 Fuel Pump
515xx Series are Recommended
EFI Regulator. Fuelab Models
To Engine Intake Manifold (Air),
typically.
Fuel Gauge Shown in
Gauge Port, Liquid Filled
Gauge may have Error Due
to Temperature Variations.
Fuelab Model 71501 is
recommended.
Y-Block or "T" Fitting,
to Split Flow into Two
Fuel Rail System.
Fuelab Y-Block Models
per 725xx Series are
Recommended
Fuel Filter with 60 Micron or
Lower Particle Rating is Required.
Fuelab Filter with 6, 10 or 40
Micron Rating is Recommended.
Check Valve is required for Reduced
Vehicle Emissions and Improved
Engine Starting. Fuelab Model 858xx Series
Filter has Check Valve Assembly
Built in and is Recommended.
Fuel Straining Filter Required, Typical
Micron Rating: 75-150, Fuelab 828xx
Series 75 Micron Filter Recommended.
110020726-1, No Rev Page 2 of 6
Fuel Filter and Fuel Pump.
Line Size Required to feed Straining
-10AN or 5/8" Miniumum
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
Plumbing Planning Notes:
This fuel pump is for external mounting only!
Submersion in fuel or other liquids can cause damage to fuel pump.
Other in-tank solutions are available from Fuelab. Adequate structural mounting and support is the responsibility of
the fabricator / 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 or shut-off valve) before fuel pump. Minimize
plumbing restrictions between fuel tank and fuel pump and regulator for peak performance, use –8AN (1/2”) to –
12AN (3/4”) line for feeding the fuel pump. Typically –6AN (3/8”) to –8AN (1/2”) line is required for the rest of the
fuel system. Note regulator manufacturer’s line size recommendations for the rest of the fuel system. 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
–8AN Inlet Port
and one
–8AN Outlet Port
) use “AN” or “military” style fittings.
This plumbing standard is commonly used with racing and high performance applications. Use of Expander Fitting
per Fuelab Model 72302 (-8AN to -10AN) is recommended for adapting line size. See step 4 on page 5, for
additional information on this port standard. A fuel filter with a 60 micron or finer 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 for feeding fuel to pump is
not recommended. If a "pick-up" tube system is employed, use
ONLY
-10AN (5/8") sized line or larger! Use of a
liquid filled gauge exposed to engine compartment heat is not recommended as the liquid inside the gauge may
exert measurement errors.
DO NOT
plumb 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.
An electric gauge or pressure transducer system is recommended for readings in a passenger compartment.
Typical EFI V-8 Fuel System Plumbing Schematic Diagram:
Special Note: Use in carbureted systems require a bypass return or relief valve.
Do not "Dead Head" Fuel Pump.
