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 -8AN (1/2”) to -12AN (3/4”) line size before pump.
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 818xx, 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 Dual Inlet Carbureted Fuel System Plumbing Schematic Diagram:
Fuel Filter with 60 Micron or
Lower Particle Rating is Required.
Fuelab Filter with 6, 10 or 40
Micron Rating is Recommended.
Fuelab 818xx Series or 828xx Series
Recomended.
Fuel Straining Filter Required, Typical Micron
Rating: 75-150, Fuelab 818xx Series, 828xx
Series or 868xx Series, 100 Micron
Filter Recommended.
Typical Dual Inlet
Carburetor Shown
40402-c Fuel Pump
110020276-1, Rev C Sheet 2 of 6
Special Note: Fuel Pump can be used with a bypass return or relief valve style regulator
as well. For extended periods of operation, Fuel Pump must operate
in reduced speed mode ONLY.
Fuel Gauge Shown in
Gauge Port, Liquid Filled
Gauge may have Error Due
to Temperature Variations.
Blocking Style Carbureted Regulator
Shown (Must be able to Accept High
Inlet Fuel Pressure, 40 PSI).
Fuelab 555xx Series, 575xx Series or
585xx Series Regulator is Recommended.
Line Size Required to feed Straining
using -8AN (1/2") Miniumum
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
