SKU: 94908100655

APR High Pressure Fuel Pumps - S5 4.2L V8 (Post Nov 2008)

Sale price$1123.17 Regular price$1247.97
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Description

APR High Pressure Fuel Pumps - S5 4.2L V8 (Post Nov 2008)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

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.
Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 94908100655

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Reviewed in the United States on March 14, 2025
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★★★★★ 4
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rocky
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Reviewed in the United States on September 20, 2025
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THE BEST, LEGIT FLUFFY
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Reviewed in the United States on March 8, 2026
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Alex Whieldon
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★★★★★ 5
You will not regret buying this blanket!
Color: Aqua, Size: Queen/King Size - 80" X 90"
I was actually looking for a cotton blanket to add to my bed for fall and winter. Then I came across THIS one. It happens to be the exact shade of (“seaglass” or teal or aqua or whatever you choose to call it) blue green that I am currently redoing my bedroom in. It was a teense more than I’d planned to spend on this project. But I was in a splurgey mood so I went for it. I can honesty say that I’d happily pay twice as much. It’s much more beautiful and much more insanely soft than it looks in the pictures. While I don’t know how the blanket feels about me, I can assure you that I am madly in love with this gorgeous thing! I can’t wait for it to cool off in Southern California so I can roll myself up in it. Maybe I’ll crank the A/C down to 50 degrees and pretend there are more than two seasons (summer and late summer) in California. Anyway, this would make a great gift. It would make a great gift for yourself. Self care is important! Spoil yourself! You, at the very least, deserve a cozy cuddly blanket. I’m certain that this luxurious blanket will cure insomnia. Maybe even depression. I’ve owned it for like 2 hours and I have a whole new outlook on life! I feel pampered, spoiled, like queen of the world, maybe even like Cleopatra! I think that it should be obvious by now that I’m giving this furry looking blanket two thumbs way way up! Sometimes I order things from Amazon and by the time they arrive Ive already forgotten about them. I was anxiously awaiting my blanket friends arrival and I was prepared to be very meh. Not this time! Nope! Best purchase ever! I know what I’m getting everyone for Christmas! Buy several for future use. This blanket has made me deliriously happy! Update: After owning this blanket for, like, a while, I still love it. Shockingly it washes up beautifully! A word of advice. Fabric softener is a big no no. It gets the fur gummy and feeling like unwashed hair after a month. I imagine. I’ve personally never gone with unwashed hair for more than a day or two. It is at its fluffy and soft best when you use one of those new Downey rinses instead. That seems to remove all residue and it comes out feeling even better than brand new. A word of warning. Do not picnic on this blanket. The fur will encase and preserve your crumbs better than Tupperware. You may find a lost treasure that you don’t actually want in there. Best used for sleeping only.
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