Plumbing Planning Notes:
Fuel pump is intended to be mounted to the top of a fuel tank or cell. Fuel pump is to be secured by 10 bolts or
screws (4” centerline), approximately ¼” diameter. The bottom surface of the fuel pump (flange) is required to be
sealed to a fabricated fuel cell, tank, or reservoir. The installer is responsible for sealing the pump and hardware at
the described flange and securing the unit and reservoir. Typically, reservoir wall thickness is not adequate to
provide even clamping force, use of a ring or flange inside fuel tank or cell is required. Adequate structural
mounting and support for the fuel pump is the responsibility of the fabricator / installer. An Inlet Straining Filter
system is supplied. An Inlet Straining provision (at inlet -8AN port) is required and is recommended to be between
75 and 150 micron rating. The use of fuel line such as stainless steel braided line and “AN” style fitting connections
is recommended. For most applications, flexible fuel line lined with PTFE (Teflon) is highly recommended. The
outlet fuel port (-8AN) uses “AN” or “military” style fittings. This plumbing standard is commonly used with racing
and high performance applications. See Step 4 on Sheet 6, 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 location. Three available fuel cell auxiliary -8AN ports may serve as return, fill, or vent ports according to
fabricator / installer discretion. Use -8AN plugs on all unused auxiliary ports. -8AN fuel compatible o-rings are
supplied with the fuel pump that are to be used with all five (5) -8AN fuel ports. 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.
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.
Flange
reservoir)
Ports
Recommendations
(to seal at fuel
Fuel Pump
for Proper
3x Aux
Cell Vent Plumbing
Follow Fuel Cell
Manufacturer's
Inlet Straining Filter
fabrication shown
(supplied)
93901 Fuel
Pump
EFI Regulator. Fuelab Models
515xx Series are Recommended
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.
(2X) Fuel Rails
with Injectors
110021251-1, Rev B Sheet 2 of 8