How to Select

Know Your Needs:

In order to determine what kind of fuel pump will take care of your engine's needs, you must first decide on (or know) the injector size and the maximum boost you plan to run. For example, an (AWP-code) 1.8T’s stock 317 cc/min injectors might require an upgrade to 580cc/min injectors. Four 580cc injectors theoretically will flow 139lph at 100% injector duty cycle (IDC). A boost pressure of 25 psi would probably be considered by many to be the upper limit for most street engines. The fuel pump you need then must be able to supply at least 139lph at 68.5psi fuel line pressure (43.5psi base pressure + 25 psi to compensate for boost pressure in the plenum) at the voltage the pump is receiving. The voltage the pump receives is critical because flow can vary by 5 to 80 percent per volt depending on the particular pump, the voltage level, and the line pressure.

Get the Ratings:

To determine if a fuel pump can meet your needs, you will need either a flow chart (see the example below) or a flow rating for the pump. A flow chart is the best choice because it shows the measured flow rate over a range of line pressures, usually in increments of either 5 or 10 psi, for a particular supplied voltage. A flow rating cites the flow rate at one line pressure. For a flow rating to be useful it also must state the supplied voltage. If the voltage is not stated, it is probably fair to assume it is 13.5 volts. The flow rating pressure is usually 0 psi (also called the free-flow rating) or some integer multiple of bars. Three bars (43.5 psi) is a popular rated pressure for electric pumps, as is 5 bars (72.5 psi).

 

USRT recommends a program called "convert.exe" to juggle the metric and standard measurements that are required to do these sorts of calculations:

Download Convert.exe




Product Image Item Name- Price
2.0 FSI Low Pressure Fuel System

2.0 FSI Low Pressure Fuel System

The 2.0T FSI fuel system is composed of two distinct sections: the high-pressure (50-130bar) and low-pressure (3-5bar). While the high-pressure...
$499.00

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Genesis Mk4 High-Flow Intank Pump

Genesis Mk4 High-Flow Intank Pump

YES, we know. It's about darned time that a proper high-flow intank pumping solution was offered for the popular Mk4 chassis (front wheel drive...
$249.00

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Billet Drop-In Fuel Pump Adapter Kit, Bosch 60mm (Audi B5/6)

Billet Drop-In Fuel Pump Adapter Kit, Bosch 60mm (Audi B5/6)

This bracket kit fits a Bosch 040 "High-Output" Fuel Pump or Bosch 044 "Motorsport" Fuel Pump into the factory basket. Stock B5...
$135.00

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Walbro Inline fuel pump

Walbro Inline fuel pump

A tuning favorite, these pumps are a little noisy but get the job done nicely. Basic installation kits supplied with brackets, foam sleeve, and...
$110.00

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6AN male fittings only for Walbro inline pump

6AN male fittings only for Walbro inline pump

 
$20.00

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Bosch Motorsports 413 (high flow) fuel pump

Bosch Motorsports 413 (high flow) fuel pump

An elite-level part from Bosch Motorsports, flow is maintained at up to 8bar fuel pressure.
$529.00

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Bosch 044 fuel pump

Bosch 044 fuel pump

Quieter, far stronger, and arguably more reliable than the Walbros, the 044 is the genuine article from Bosch . Ideal for keeping high-boost fuel...
$199.00

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Bosch 040 fuel pump (B6 Audi intank)

Bosch 040 fuel pump (B6 Audi intank)

Quieter and easier to fit than Walbros, the Bosch 040 fits inside a B6 Audi's fuel tank. It fits and operates in stock position when combined...
$195.00

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-6AN male fittings only (Bosch 044)

-6AN male fittings only (Bosch 044)

$30.00

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6AN + 5/16" barb fittings kit for Bosch pumps

6AN + 5/16" barb fittings kit for Bosch pumps

$35.00

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