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Feeding a Carbureted Engine with an EFI Fuel Pump

It is becoming more and more common for people to use an in-tank electric pump to feed a carbureted engine.  Many new engines simply do not have the provisions to use a mechanical fuel pump.  Sometimes there is no room to have a mechanical fuel pump in the engine compartment.  Others simply want to clean up the look under the hood and do so by removing the mechanical fuel pump.

Any of our in-tank pumps can feed a carbureted engine provided that a bypass regulator is used.  Because an EFI fuel pump can produce a large amount of flow, a bypass regulator is necessary in order to return the excess fuel back to the fuel tank.  When shopping for a bypass regulator make sure that you buy one that is specific for carbureted applications.  This is because most carburetors only require around 6 psi to operate.  Typical EFI bypass regulators run between 40-80 psi while most carbureted bypass regulators are adjustable from 4-10 psi.  Keep in mind that since the pressure requirements of a carbureted application is lower that an EFI application the flow rate of your pump will be higher.  This means that the fuel pump is capable of supporting higher horsepower.  For most applications our TBI or 2 series fuel pumps provide enough flow for a carbureted engine.  

For more information on selecting a fuel pump 

For a carbureted fuel line kit 

The diagram below outlines how the fuel lines can be ran using a bypass regulator on a carbureted application.  Please note that it is important to have a large return line so no back pressure is created.

For a printable version 

Fuel Line Routing for EFI pump when using a Carb
 
 
 
 
Fuel Line Routing

EFI Fuel Line Routing

Below we have outlined the most common ways that a tyical EFI fuel system is ran.

EFI Fuel Line Routing Using Corvette LS9904 Filter / Regulator

EFI Fuel Line Routing Using Corvette LS9904 Filter / Regulator

 

The above diagram shows how to route your fuel lines when using a Corvette fuel filter / regulator part  # LS9904.  We also have a full line kit with all the necessary fittings part # LS-LINE-KIT

 

EFI Fuel Line Routing Using an Adjustable Regulator Before the Fuel Rails

EFI Fuel Line Routing Using an Adjustable Regulator Before the Fuel Rails

 

The above diagram shows how to route your fuel lines using an adjustable bypass regulator before the fuel lines.  We also have a full line kit with all necessary fittings part # EFI-LINE-KIT.

 

EFI Fuel Line Routing Using an Adjustable Regulator After the Fuel Rails

EFI Fuel Line Routing Using an Adjustable Regulator After the Fuel Rails

 

The above diagram shows how to route your fuel lines using an adjustable bypass regulator after the fuel lines with two lines coming from the rails to the regulator. 

 

EFI Fuel Line Routing Using an Adjustable Regulator After the Fuel Rails

EFI Fuel Line Routing Using an Adjustable Regulator After the Fuel Rails

 

The above diagram shows how to route your fuel lines using an adjustable bypass regulator after the fuel lines with one line coming from the rails to the regulator.  We also have a full line kit with all necessary fittings part # EFI-LINE-KIT.