APR is pleased to present the high pressure fuel pump upgrades for the 4.2L FSI V8.

APR is a Tier-One OEM supplier of high pressure fueling components to VAG and has operated with a nearly perfect tract record since the program's motorsport backed inception in 2006.   With thousands of pumps sold yearly, APR has a wealth of knowledge and manufacturing techniques utilized in the production of critical fueling components with exceptional reliability.

The engine’s fueling system operates to a maximum of 1,973 psi (136 bar) of pressure to correctly spray and atomize fuel directly into the engine’s cylinders. This is contrast to multi port injection vehicles of the past which typically operated around 40-60 PSI and were driven off of a low pressure fuel pump. To generate these enormous pressures, the 4.2L FSI V8's variable low pressure fuel pump supplies fuel to two cam driven and solenoid fired high pressure fuel pumps which in turn supplies the injectors with fuel.

A dual-lobe cam located on each intake camshaft drive the 4.2L FSI V8's Hitachi high pressure fuel pumps. As engine speed increases, so does each pump’s ability to displace a greater volume of fuel per minute. The maximum volume each pump can deliver per revolution on the dual-lobe cam is dictated by the stroke length from each cam lobe’s lift and bore diameter of each pump’s internal pressurizing cylinder. It’s important to understand, despite the name, APR’s High Pressure Fuel Pump upgrades are not necessarily designed to increase the engine’s fuel rail pressure. The primary goal is to increase the volume of available fuel.

Note: Set of 2 fuel pumps.