Plumbing Planning Notes:
Fuel Pump is recommended for external use only. Inlet Straining Filter may be omitted if fuel system is cleaned,
and only pre-strained fuel is used to fill the fuel tank or fuel cell with great care ensuring debris not to enter tank.
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 -10AN (5/8”) or -12AN (3/4”). Typically -6AN (3/8”) to -
10AN (5/8”) 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 to reduce risk from foreign object damage. Special Note: Use only Fuelab 828xx or 868xx
Series Filter with 100-Micron Rated Filter Element for -10AN or -12AN Line is recommended. All fuel line used must
handle high pressure. The use of fuel line such as stainless-steel braided line and “AN” style fitting connections are
recommended. The fuel ports (two -10AN Ports) use “AN” or “military” style fittings. This plumbing standard is
commonly used with racing and high-performance applications. See Step 4 on Sheet 4, 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. An electronic gauge or pressure transducer system is recommended for readings in
a passenger compartment.
Typical EFI V-8 Fuel System Plumbing Schematic Diagram:
Y-Block or "T" Fitting,
to Split Flow into Two
Fuel Rail System
110020273-1, Rev E Sheet 2 of 6
Special Note: Use in carbureted systems require a bypass return or relief valve.
Do not "Dead Head" Fuel Pump.
EFI Regulator
To Engine Intake Manifold (Air)
Fuel Gauge Shown in
Gauge Port, Liquid Filled
Gauge may have Error Due
to Temperature Variations.
Fuel Filter with 60 Micron or
Lower Particle Rating is Required.
Fuelab Filter with 6, 10 or 40
Micron Rating is Recommended.
Fuelab 828xx Series Recomended
Check Valve Required for Reduced
Vehicle Emissions and Improved
Engine Starting. Fuelab 858xx Series
Filter has Check Valve Assembly
Built in.
(2X) Fuel Rails
with Injectors
Fuel Straining Filter Required, Typical Micron
Rating: 75-150, Fuelab 828xx Series or
868xx Series, 100 Micron Filter Recommended.
42401-c Fuel Pump
using -10AN (5/8") Miniumum
Line Size Required to feed Straining
Fuel Filter and Fuel Pump.
Vented Fuel Cell or Fuel Tank.
Tank must be Plumbed
Follow Fuel Cell Manufacturer's
Recommendations for Proper
Cell Vent Plumbing
