SKU: 7620582785

APR High Pressure Fuel Pumps - B7 RS4 - MS100072

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Description

APR High Pressure Fuel Pumps - B7 RS4 - MS100072Overview: The APR High Pressure Fuel Pump (HPFP) dramatically increases the maximum volume of fuel the HPFP can deliver. In doing so, the direct injection fueling system is capable of satisfying fueling requirements set forth by high horsepower setups. This is accomplished by increasing the displacement of the pump using high quality components to exacting tolerances. How the direct injection system works: A low pressure fuel pump (LPFP) in the fuel

Overview:

The APR High Pressure Fuel Pump (HPFP) dramatically increases the maximum volume of fuel the HPFP can deliver. In doing so, the direct injection fueling system is capable of satisfying fueling requirements set forth by high horsepower setups. This is accomplished by increasing the displacement of the pump using high quality components to exacting tolerances. How the direct injection system works: A low pressure fuel pump (LPFP) in the fuel tank delivers fuel to the high pressure fuel pump (HPFP) at roughly 4 to 6 bar. Fuel pressure is then bumped up to a maximum of 136 bar, depending on factory parts, with the HPFP. Finally, high pressure fuel is delivered to the injectors, which spray directly into the cylinders. The problem: The volume of fuel the HPFP pump can displace is directly tied to the displacement of the pump (Internal bore size, and camshaft dictated stroke), and engine speed. The pump is driven off of a camshaft. Upgraded supercharger and turbocharger systems are capable of taxing this system, especially in the mid to lower RPM range where fuel volume is lower. The APR solution: We dramatically increase the volume of fuel the HPFP can displace at every RPM by increasing the displacement of the HPFP. This is accomplished by increasing the bore diameter of the pump's internal pressurizing cylinder. It's important to understand, despite the name, a HPFP upgrade is not necessary designed to increase the engine's fuel rail pressure. The primary goal is to increase the volume of fuel available, which will keep fuel pressure steady even in the most demanding of situations! High quality components and extreme tolerances: The HPFP internals must be machined to extreme tolerances and installed in a clean environment or the pump can easily fail. Dimensional tolerances on the APR HPFP are as tight as .00004" and geometric tolerances are as tight as .00005". The plunger and barrel are created from certified and heat-treated bearing-grade stainless steel and the plunger undergoes a special diamond like coating process for exceptional surfaces hardness and ultra-reliable operation. To prevent float associated with altering the plunger's mass, APR supplies each unit with a properly specified spring. All internal seals are replaced, including the spring seal, and the tip of the pump retains the factory pivoting head to reduce cam follower wear and piston side loading. Internal testing: All APR HPFPs are assembled in house under strict assembly guidelines. Each pump is then tested on our test rig to ensure the pumps operate as designed. This step is important for several reasons. It's critical in determining if a pump has a failure from incorrect install, a leaking seal, or a bad solenoid. Secondly, a seized pump on the vehicle at startup can cause damage to the engine's camshaft. By testing each pump, we all but eliminate these possibility. Proven track record: APR pioneered HPFP upgrades in the early days of VAG direct injection engines. Soon after, APR became an OEM supplier of HPFP and GDI components to VAG for use in various race cars, racing series, project cars, and concept vehicles. The APR HPFP has been at the center of countless motorsport victories across the globe and has operated with a nearly perfect tract record since the program's motorsport backed inception in 2006. With tens of thousands of pumps sold, APR has a wealth of knowledge, and manufacturing expertise necessary to deliver a product that will and has stood the test of time. This kit included two new rebuilt pumps.
 

Features:

  • Dramatically increases the volume of fuel displaced by the HPFP
  • Maintains higher pressures under demanding situations
  • Fully rebuilt in house
  • Fully machine tested and broken in before shipping
  • New factory pumps included
  • Upgraded and weight matched spring
  • DLC coated piston
  • Heat-treated bearing-grade stainless steel material
  • Supports big power
  • .00004" dimensional tolerances
  • .00005" geometrical tolerances
  • Spring seals replaced

 

Application:

Year Make Model Submodel Engine Size
2008 Audi RS4 Cabriolet 4.2L V8
2007 - 2008 Audi RS4 Base 4.2L V8

 

Specs:

Brand APR
Emission Code 4
Larger Bore Yes
Larger Piston Yes
New or Rebuilt Pump New
New Seals Yes
New Spring Yes
Piston / Bore Material Bearing-Grade Stainless Steel
Piston Coating DLC
Product Type High Pressure Fuel Pump
Quantity 2
Rebuild No
Tested Yes
Warning California Proposition 65
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SKU: 7620582785

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Maria Leonard Olsen
Belleville, US
★★★★★ 5
Best Book on Improving Communication in Relationships
Format: Paperback
Such a helpful book, with concrete tips for improving communication in relationships. I find myself returning to this book whenever things become challenging in a relationship. I also attended a retreat based on the book’s teachings. Incredibly helpful.
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Reviewed in the United States on July 23, 2025
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Matthew Poe
Pawtucket, US
★★★★★ 3
Interesting, but not empirically validated, and written explicitly for straight people (why?!)
Format: Kindle
This one’s the 500-pound gorilla of the healthy-couple self-help genre, with thirty years in print, scores of Oprah appearances by the authors, thousands of therapists practicing the Imago framework. The main thing that I need to tell you about this updated edition, from the year 2019, is that it does not mention or acknowledge the existence of queer or same-sex couples even one time. In fact, it really doubles down on the husband and wife stuff, takes gender roles pretty seriously, which is not a thing I realized we did anymore, except as a joke. Anyway, talking only to straight people is not too relevant to my interests, and while the conservative Christian viewpoint is pretty subtle in the advertising, just be aware of that PROBABLY NOT ACCIDENTAL omission going in, queer friends. (This is made even more impressive by the fact that the heart of the Imago approach is based on childhood trauma, about the ways in which our parents caused us to suppress or hide or ignore parts of ourselves in order to be accepted and loved. Just let that sink in, because I’ve been reading this book for the past week and I am still reeling from the irony that people who have been thinking for the past three decades about the ways that parents cause trauma to kids by failing to accept parts of them have missed the VERY OBVIOUS AND RELEVANT EXAMPLE of queer folks.) That aside, for me the book was a mixed-bag of some interesting and provocative ideas (I’d put these in the category of poetic notions, or interesting narrative ideas), alongside some really kooky 20th century neo-Freudian stuff (rooted in part in Freud’s theory of repetition compulsion.) I’m no fan of Freudian approaches, and after I started this book, I decided to see how empirically-validated this Imago approach is: based on what I found, there seems to be basically no evidence that this therapy is effective. Am I glad I read it? I think so?? It was thought-provoking, with the pretty significant grain of salt that there’s not much evidence to support that Imago therapy is much better than doing nothing at all. Also, I feel a little gross giving my money to relationship experts who (in 2019!!)) won’t even acknowledge the existence of queer people, even when doing so would obviously strengthen their core arguments and provide better examples than some of the meek ones they give.
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Reviewed in the United States on November 18, 2021
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Amazon Customer
Massapequa, US
★★★★★ 5
Great book!
Format: Paperback
I read this once through on my own and picked up a lot of great wisdom. Now my spouse are reading it together so we can answer the questions together. I'm excited for thought provoking discussions on raising our future child.
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Reviewed in the United States on November 4, 2020
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Amy Tan
Louisville, US
★★★★★ 5
Now you know (some of) what you don't know
Format: Kindle
As I'm ready to embark on parenthood, I truly appreciated the insights offered by these parents. The learning has given me more confidence and preparation in managing expectations, handling difficult situations and being the ideal parent.
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Reviewed in the United States on February 12, 2019
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Amanda Santiago
Phoenix, US
★★★★★ 5
As an expectant parent, I found the information in ...
Format: Paperback
As an expectant parent, I found the information in the book to be helpful. While I know I will not come across all the topics immediately, I know I can keep it as a reference in my journey of parenting.
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Reviewed in the United States on January 14, 2017

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