As with any of our machined products, the block is 100% CNC cut in house here in Johannesburg Michigan.

For those that don’t know, the CP4 is the fuel injection pump that is installed on the second generation 3.0 TDIs and 2.0L TDIs. This injection pump uses only its fuel supply for lubrication, diesel first flows into the bottom end of the pump to lubricate the camshaft, rollers, lifters, and bushings before the diesel flows up to the metering valve to be used for injection. Unfortunately, the CP4 can be rather sensitive to fuel quality. If contamination occurs and one of the rollers gets stuck, the pump will start making metal shavings in the bottom end. As the CP4 continues to pump, it is now pumping diesel contaminated with metal shavings through the metering valve and into the rest of the injection system. When this failure occurs the CP4, injectors, fuel rails, rail pressure sensor, pressure control valve, high pressure lines, injector return lines, tank lines, and fuel module will all need to be replaced. This kit doesn’t prevent a failure from happening but it does isolate the CP4s lubrication supply from the injection fuel supply and prevents all the other components in the injection system from being damaged. Because of how the metering valve is isolated and given its own supply with this kit, now in the event of a failure only the CP4 and return filter will need to be replaced. This kit will fit TDI equipped vehicles with the CPNB, CNRA, CNRB, CATA, CBEA, CJAA, and CKRA engine codes. No tune is required for proper operation, also works with vehicles that have already been tuned. Please note intake manifold removal is required to install the kit on the 3.0L's, now is a good time to reseal anything in there if you deem necessary.

Both the Earl's and DeastchWerks filter options are 10 micron rated and contain a neodymium ring magnet on the outlet side of the element to help further catch any fine metallic particles. The DW filter has a pleated stainless mesh element where the Earl's has a sintered bronze element. For the DW filter, the spec sheet can be found here which applies to both the 5/16" and 3/8" versions of the filter.

The block itself has been recently updated to use a permanent pressed-in sealing plug that will come pre-installed in the block when you receive your kit.

The kit for the CPNB, CNRA, and CNRB includes a genuine Bosch metering solenoid.

All other kits do not require a new metering solenoid.

The block only option includes the block, o rings, and socket cap screws for those who wish to source their own ancillary parts.

For CRUA Golf/Jetta only, we have added the option for a bracket made by Olsen Fabrication to mount a 1"-14 thread filter head for converting the OEM VW fuel filter to a Cat 1R-0749 or 1R-0750 filter. This is for well skilled DIY customers only and does not include the filter head or any other parts.

If you have a highly tuned 2.0L TDI and experience a low rail fault after installation, we also offer a Cascade Valve Adjustment Tool Kit to adjust the feed pressure of your CP4 to eliminate the fault.

Instructions for 2.0L TDI (CBEA/CJAA, CKRA, CRUA/CVCA) can be found here

Instructions for 3.0L TDI (CPNB/CNRA/CNRB, CATA)

3.0L CATA Specific Instructions courtesy of funbard on ClubTouareg

A customer made video for the 2.0L CJAA

Another customer video for the 2.0L CBEA/CJAA install by Paul's Performance

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TDI CP4 Metering Valve Bypass Kit

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