Mazda DISI Do It Yourself Pump Internals

Mazda Do It Yourself Pump Internals

Mazda Do It Yourself Pump Internals


The HPFP Upgrade high pressure fuel pump increases the volume of fuel from stock by over 40%. To achieve this we modifying some key internal parts within the pump. Changing these components requires precision machining, enlargement of the pump and piston, and precision measuring components. Using inferior components on this critical part can lead to many problems. We only use certified H13 tool steel for our pumps, the final finish of the sleeve to piston surface is measured in RA then a final check is done in RZ (mirror like finish). This process allows for final fitment that goes to the .000005 of an inch. All our pump internals are nitride treated then cooled in a nitrogen vacuum chamber. This has been proven to give the best material treatment available for the H13 tool steel and the process is certified to meet the specifications for the high pressure pump internals. All parts are then hand fit (with protective gloves) and measured with air gauges to verify you are getting "matched" sets with every pump or pump internal. The HPFP Upgrade fuel pump tester is a key element in pump production process. With this fuel pump tester we can perform several tests to verify pump operational parameters:

  • Peak Flow vs RPM
  • Peak Pressure vs RPM
  • Chart RPM and pressure curves
  • Chart RPM and flow curves
  • Minimum operational pressure
  • Pump solenoid operation
  • Pump seals are good
  • Fuel temperature at high pressure discharge point
  • Low pressure feed pump psi


Pump internals are matched sets, come with directions for install, break in directions and pre-start assembly lube. Gloves are included to keep the oils and acids from your hands getting onto the pumps surfaces.

Product Added: June 25, 2011
Part Number: hpfp00005