APR High Pressure Fuel Pump - Audi S5 4.2FSI
APR High Pressure Fuel Pump - Audi S5 4.2FSI

APR High Pressure Fuel Pump - Audi S5 4.2FSI

Regular price
£1,469.38
Sale price
£1,469.38
Tax included.

APR High Pressure Fuel Pump for the 4.2 V8 FSI engine.
These are a requirement when doing a Stage 3+ Supercharger or Turbo conversion on the 4.2 V8 FSI engines.

- OUTRIGHT PURCHASE
This brand new fuel pump does not require any return for your old unit.

- REBUILD ONLY
The rebuilt units carry a surcharge of £150.00 refundable on receipt and inspection of your original fuel pump.
Alternatively if time is not an issue, you can send us your original fuel pump which can be shipped out to the U.S. for the upgrade procedure.
The Return/Inspection/Surcharge refund procedure may take upto 8 weeks.



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.

In the early 2000's, VAG began supplying engines with a new direct injection technology known as FSI. Unlike conventional engines of the past, fuel is sprayed directly into the cylinders under extreme pressure resulting in increased power with lower consumption rates and fewer emissions. The technology has spread across VAG's entire lineup of modern gasoline engines and is present in the 4.2L FSI V8.

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.

The engine's fueling system is very capable without modification, even at high power levels generated using APR's previously available Stage III TVS1320 Supercharger System. However, APR's Stage III+ TVS1740 Supercharger System System is capable of generating significantly more power and requires modification to high pressure fuel pumps to keep up with fueling demands.

APR High Pressure Fuel Pumps

HPFP
APR High Pressure Fuel Pump Internals

Internals
Each APR High Pressure Fuel Pump addresses fueling needs and leaves plenty of headroom for safety and further increased power levels in the future. By increasing each pump's internal capacity, the fueling system is capable of displacing a higher volume of fuel per minute at every RPM.