JHM High Pressure-Mechanical Fuel Pump Upgrade Kit, HPFP for B7-RS4, B8-S5 w/ 4.2L FSI

Our brand new, JHM High Pressure Fuel Pump (HPFP) Upgrade will help you get the most out of the direct injection fueling system on your 4.2L FSI. Not only does the upgrade increase the amount of fuel your high pressure fuel pump can deliver but it will also decrease the duty cycle of the N276 solenoid on your pump. Lowering the duty cycle of the N276 will extend the life of this solenoid – an item that commonly fails on these pumps but isn’t available separately. This upgrade kit is recommended for our JHM Stage 1 Supercharger Kits on the B7-RS4 and B8-S5 with the 4.2L FSI V8s.

In true JHM fashion, we have been performing long term testing on these parts since 2013.

Our HPFP Upgrade will fit all all Audis and Volkswagens with Hitachi High Pressure Fuel Pumps. This includes the Audi B7-RS4 4.2L FSI V8, B8-S5 4.2L FSI V8, B7-A4 2.0T FSI, and Volkswagen Mark V and VI GTIs and GLIs with the 2.0T FSI. This upgrade does not fit newer TSI motors with Bosch pumps.

NOTE: This is the JHM HPFP Upgrade for the 4.2L FSI V8 motor and includes the parts needed to upgrade 2x Hitachi HPFPs. If you are interested in the upgrade kit for your 2.0T FSI, please go back to the “Engine and Performance” section of the B7-A4 2.0T or search our website for “JHM HPFP 2.0T”.

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NOTE: 1 set of JHM HPFP Upgrade Internals shown. This kit will come with a pair of internals.

Click to enlarge picture

NOTE: 1 set of JHM HPFP Upgrade Internals shown. This kit will come with a pair of internals.

FEATURES
– Piston has 50% more area than OEM (OEM Piston Size: 8.0mm versus JHM Piston Size: 9.8mm)
– Piston head optimized for ideal fuel flow direction
– Piston surface hardened before coating
– Piston machined after coating
– Upgraded spring, slightly stiffer than OEM for improved high RPM piston stability
– Uses OEM-style spring keeper

PARTS INCLUDED
– 2x Upgraded Piston w/ Directional Flow Head
– 2x Upgraded Spring
– 2x Spring Keeper and Tappet Assembly
– 2x Piston Cylinder or Sleeve
– 1x Installation tool

FITMENT: The JHM High Pressure Fuel Pump Internals Upgrade Kit will fit all 4.2L FSI V8 motors with the Hitachi fuel pumps. This includes the following cars:
– Audi B7-RS4 with the 4.2L FSI V8
– Audi B8-S5 with the 4.2L FSI V8

NOTE: Does not fit the newer Audi-VW cars with “TSI” motors and Bosch high pressure pumps.

INSTALLATION AND INSTRUCTIONS

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