7.3L Powerstroke HIGH-PRESSURE Oil Pump 101

How The 7.3L Power Stroke HPOP Works

In the mid-1990s, tightening particulate matter emissions standards gave birth to the hydraulically actuated electronic controlled unit injector system we all know as HEUI. One of the engines to debut the new injection technology, which Caterpillar leased to Navistar, was the 7.3L Power Stroke. In the past, we’ve detailed the makeup of an oil-fired HEUI injector at length, but what about the other piece of the puzzle, the high-pressure oil pump? As we close in on 30 years since HEUI was introduced, many still don’t know the inner workings of an HPOP. What’s more, is that a lot of 7.3L enthusiasts have never even seen it inside a high-pressure oil pump.

This month we’re taking an in-depth look at the 7.3L HPOP. We’ll show you all the components packed within its compact housing, how they work together to provide oil volume and highlight the electrically operated dump valve that controls injection control pressure (the IPR). Ever wondered what the difference is between a “15-degree” and a “17-degree” HPOP? Keep reading. After we distinguish the difference between the early and late high-pressure oil pumps, we’ll cover some of the modifications that allow an HPOP to produce more oil volume in order to support larger injectors. Let’s dig in…

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Also known as the high-pressure oil supply pump, the high-pressure oil pump (HPOP) employed on the 7.3L Power Stroke is charged with providing adequate oil volume to operate the injectors. It is gear-driven via the camshaft, though its drive gear is not timed to the cam or keyed or pinned to the pump itself, and it mounts to the 7.3L’s front cover at the front of the lifter valley.

Physically, the HPOP mounts to the 7.3L’s front cover via two bolts, both of which call for a 10mm socket to remove or install them. We’ll also note that the driver-side HPOP-to-front cover mounting bolt is the longer of the two fasteners. The HPOP mounts to the front cover by way of a reusable gasket.

It should be noted at the outset that the HPOP can never perform its job without an efficient low-pressure oil pump in the mix. The LPOP (or lube oil pump, gerotor pump) routes low-pressure engine oil through a check valve and ultimately into the high-pressure oil pump reservoir. Additionally, a short circuit oil gallery is connected to the gerotor pump’s discharge, which provides a quick fill of the high-pressure oil pump reservoir for timely cold starting.

Of the axial piston variety, the 7.3L HPOP is a fixed displacement pump that utilizes seven pistons. A brass cylinder block houses all seven pistons, which ride on what’s known as a swash plate and also utilizes a piston slipper. The pump’s drive shaft is made from special, hardened steel.

The HPOP’s role in the HEUI system is to route high-pressure oil to the oil galleries machined into the cylinder heads and, ultimately, the top side (oil side) of the injectors. And while oil pressure leaving the HPOP can be pressurized as high as 3,000 psi in stock form thanks to the IPR (more on the IPR later), in-cylinder injection pressures can reach as much as 21,000 psi. This is because the intensifier piston in each HEUI injector multiplies the hydraulic force applied to the fuel plunger by a ratio of 7:1.

This is the hardened drive shaft that turns the internals that rotates inside the HPOP. The drive gear, which again is driven off of the camshaft, is bolted to this shaft. The drive gear bolt calls for an 18mm socket and 95 ft-lb of torque. And though it isn’t always performed, checking the pump gear to cam gear backlash is recommended any time an HPOP is installed on a 7.3L.

Even if you only know a few of the components contained within an HPOP, you’ve likely heard the term “swash plate.” This piece sits stationary at an angle and is what the pistons move against as the cylinder block rotates, causing the pistons to reciprocate within their respective bores. The angle of the swash plate determines the stroke of the pistons. The higher the angle, the longer the stroke—and the larger the displacement and the more volume the pump puts out.

During the suction cycle or one-half of a revolution, the pistons create a vacuum that forces oil in. On the other half of the revolution, the pistons discharge oil. In the 7.3L HPOP, the pistons measure 0.436-inches in outer diameter. A 15-degree pump’s internal cc size is roughly 6.8 cc’s, while the 17-degree pumps is 7.2 cc’s.

Piston springs sit under each piston within the cylinder block. During the suction cycle (also called the intake stroke), the piston spring ensures the piston is pulled back and maintains contact with the swash plate, which allows oil to fill the empty cavity that’s left behind. Then on the discharge stroke, the swash plate forces the piston back into the cylinder block, which compresses the spring and discharges the oil.

Another vital part of the HPOP is the reservoir, which keeps a constant supply of engine oil available for the pump to use thanks to a passage located in the 7.3L front cover. The high-pressure oil reservoir tower is sealed via an O-ring on the pressure side and RTV sealant on the splash side. It holds approximately one quart of engine oil.

The rear cover snap ring is essentially what holds all the contents of the high-pressure oil pump together, and we’ve seen aftermarket pumps incorporate a 360-degree spiral lock ring here for added insurance. Unfortunately, an oil leak from the rear cover is discovered here from time to time, most often due to a rear plate O-ring seal failure.

High-pressure hoses feed the oil galleries that are integrated into the 7.3L cylinder heads. Not only are the hoses rated to handle the fluctuations in pressure they constantly see, but for the temperature differentials, they regularly experience. Beginning with the ’99 model year (Super Duty) 7.3L engines, the high-pressure oil lines feature quick-disconnect fittings. Prior to that, they were threaded.

IPR stands for an injection pressure regulator, and this electrically operated dump valve is what controls ICP (injection control pressure, also known as high-pressure oil pressure). It’s controlled by the PCM, mounted on the rear of the HPOP, and precisely varies its outlet pressure in a range between 450 psi to 3,000 psi (in stock form). Its excess flow is dumped into the return circuit.

The IPR essentially increases ICP by restricting the path to drain. In order to increase ICP (again, high-pressure oil psi), the PCM will command a higher duty cycle from the IPR. It does this by sending an ICP-based electrical signal to the IPR solenoid, which creates a magnetic field that applies a variable force on the poppet to control pressure. The duty cycle on the IPR is measured in a percentage.

While the IPR duty cycle can be a fun parameter to watch, it’s important to remember several key things in relation to it. As a general rule of thumb, less than a 30-percent duty cycle should be observed in a crank-to-start scenario (and also note that it takes 450 to 500 psi of ICP, minimum, to start a 7.3L). At idle, 8 to 16 percent is normal with the engine up to operating temp (shown). At full load, less than 50 percent is typical. And finally, the maximum commanded IPR duty cycle on a ’94.5-’97 model will be 54 percent, and 65 percent on ’99-newer 7.3L’s.

IPR replacement isn’t always necessary for a rough-running 7.3L suffering from poor performance or an oil leak in the valley. Sealed to the back of the HPOP housing via an O-ring and with an additional O-ring being serviceable as well, the IPR can be given a new lease on life with a simple, $13 reseal kit like the one shown here, and offered by Riffraff Diesel Performance.

Similar to an engine, additional displacement can be achieved by increasing the bore and/or stroke of an HPOP. A longer stroke is most common, and as mentioned can be executed by increasing the angle of the swash plate. However, over-stroking the pistons can lead to excessive side loading. Larger diameter pistons are the other means of adding displacement, which in the interest of ensuring optimum wall strength can call for a whole new (thicker walled) cylinder block.

Of course, there are other parts and practices that go into some aftermarket HPOPs that make them better than the rest. Due to their stellar track records, Terminator Engineering’s T-500 HPOP and DieselSite’s Adrenaline HPOP (shown) represent these kinds of high-quality pumps. Tighter tolerances decreased internal clearances, improved pump efficiency, consistent pump output, and a slightly increased swash plate angle (again, for added stroke) are all built into an Adrenaline, which—like the T-500—is a direct replacement performance HPOP that makes use of the factory housing but little else.

It goes without saying that ICP is an important part of the equation, but specifically how well your HPOP can build adequate ICP and then maintain it is most critical. By and large, AA code injectors (’94.5-‘97) run great with anything higher than 2,600 psi worth of ICP, AB and AD code (split-shot) injectors (’97 CA and ’99-‘03) run better with at least 2,900-3,000 psi, and hybrid injectors (which sport a 5:1 injection ratio) tend to run best at 3,200 psi. Although most HPOPs can support in excess of 3,400 psi, anything higher than 3,200 psi is said to offer very minimal gains while also being exceptionally hard on injectors.

From stock injector engines up to a7.3L running 285cc AD hybrids, DieselSite’s Adrenaline HPOP is a proven performer. Not only can it support 550-hp, but it can last as long as a factory pump (if not longer) while doing it. The Adrenaline’s great reputation for reliability likely stems from the company’s stringent validation process that’s performed before a pump is allowed to leave its facility.

As was mentioned earlier, larger pistons residing in a redesigned (bigger) cylinder block is one way to improve the displacement of a 7.3L HPOP. The SRP1.1 from yesteryear was one such pump, and these upsized pistons were key pieces in what made the pump capable of supporting a 300cc hybrid injector equipped with a 200-percent over the nozzle. They measure 0.500-inches in diameter (left) vs. 0.436-inches in stock.

Opening up the output ports of the HPOP increases the volume of oil leaving the pump. On the aforementioned SRP1.1, output puts were upsized to 0.360-inches in diameter (right) vs. 0.210-inches stock (left). And taking a step further in improving reliability, all fittings were increased to #8 SAE ORB from #6 SAE ORB to prevent stripping of the threads and/or the potential of them blowing out.

Early model 7.3L HPOPs featured a rear ball bearing for optimum support, but it was replaced with a bushing on later model pumps. Some aftermarket HPPs (the Adrenaline included) re-incorporate dual ball bearings into the mix. Though the bushing was never a major longevity concern, exchanging it for dual ball bearings illustrates a company’s investment in its product.

When it comes to the kinds of high-flow hybrid injectors common in the 7.3L performance world, there is no better high-pressure oil solution than running two pumps. Think of it in terms of dual CP3s on a common rail, where twin pumps help maintain consistent volume to the rails at all times. The major players in the dual HPOP game are Full Force Diesel and Terminator Engineering. Full Force’s Dual HPOP Pump kit, which was acquired from BTS years ago, stacks two pumps on top of each other, while Terminator’s “Big Oil” dual HPOP system locates pumps in-line in the valley. The big takeaways of running two stock displacement HPOPs are abundant high-pressure oil volume and factory-like reliability.

A third dual HPOP option that is highly popular in the big injector segment is the Gen3 from Swamps Motorsports. Based on the use of an industrial-grade, Haldex hydraulic pump, it’s paired with your existing HPOP and works in conjunction with the factory pump’s drive gear. The Gen3 mounts above the factory HPOP don’t require a second IPR, and ship 90 percent assembled.

SOURCES

DieselSite
888.414.3457
dieselsite.com

Full Force Diesel
615.962.8291
shop.fullforcediesel.com

Riffraff Diesel Performance
541.879.1052

Swamps Motorsports
615.640.6273
swampsmotorsports.com

Terminator Engineering
terminatorengineering.net

FREQUENTLY ASKED QUESTIONS

What is the Ford 7.3 Powerstroke High Pressure Oil Pump compatible with?

Compatibility of the Ford 7.3 Powerstroke High Pressure Oil Pump

The Remanufactured High Pressure Oil Pump specifically fits several models and is designed for the Ford 7.3L Powerstroke and T444E engines. Here’s what it’s compatible with:

Vehicle Models: It’s suited for Ford’s F-Series and E-Series vehicles produced between 1999.5 and 2003.
Engine Specifications: This pump works well with Navistar engines, particularly those beginning with Engine Serial Numbers (ESNs) 843990 and higher.

Use this pump to ensure optimal performance and reliability for your Ford 7.3L Powerstroke engine or a compatible Navistar engine.

What are the differences between the standard remanufactured and premium options for the Ford 7.3 Powerstroke High Pressure Oil Pump?

Differences Between Standard Remanufactured and Premium Options for the Ford 7.3 Powerstroke High Pressure Oil Pump

When deciding between the Standard Reman and Premium variants of the Ford 7.3 Powerstroke High Pressure Oil Pump, there are a few important distinctions to consider. These differences can significantly impact performance, longevity, and your peace of mind.

Warranty Coverage

Standard Reman: Comes with a 1-year warranty, offering you basic protection and assurance for a shorter period.
Premium: Offers an extended 2-year warranty, providing double the protection period and greater peace of mind.

Quality and Specifications

Standard Reman: These pumps are remanufactured to align with original equipment (OE) specifications. They are expertly refurbished to ensure they meet or slightly exceed the basic standards set by the original manufacturer.
Premium: This option is comprehensively rebuilt and thoroughly tested to not only match but often surpass OE standards. If reliability and performance are priorities, the Premium choice addresses these needs with precision.

Included Components

Both options come with a mounting O-ring, simplifying the installation process and ensuring a secure fit with minimal additional purchases required.

Choosing the right option depends on your specific needs and priorities. If longevity and enhanced performance are significant factors, the Premium version is likely the better choice. However, if you’re looking for a cost-effective solution with reliable quality, the Standard Reman provides adequate assurance.

What is included with the purchase of a remanufactured Ford 7.3 Powerstroke High Pressure Oil Pump?

What Do You Get with a Remanufactured Ford 7.3 Powerstroke High Pressure Oil Pump?

When you purchase a remanufactured high-pressure oil pump for the 7.3 Powerstroke engine, designed for models from 1999.5 to 2003, here’s what you can expect:

Compatibility: The pump is engineered to work seamlessly with Ford’s F-Series and E-Series models, as well as Navistar engines with engine serial numbers (ESNs) 843990 and newer.
Essential Accessories: Your purchase includes a mounting gasket, ensuring you have everything needed for a proper installation right out of the box.
Warranty Coverage: Enjoy peace of mind with a robust, unlimited mileage warranty that lasts for one year.

Whether you’re working on a Ford or a Navistar engine, this remanufactured pump delivers both reliability and longevity.

How can a customer inquire about the Ford 7.3 Powerstroke High Pressure Oil Pump or get assistance from professionals?

Need Help with the Ford 7.3 Powerstroke High Pressure Oil Pump?

If you’re looking to inquire about or need assistance with the Ford 7.3 Powerstroke High Pressure Oil Pump, there are a few straightforward ways to connect with professionals who can help.

Reach Out Via Email

Send an Email: Directly contact experts by sending an email with your specific questions or concerns. This allows you to get detailed responses tailored to your needs.

Call and Speak to a Pro

Phone Support: Dial 1-844-487-2787 to talk directly to knowledgeable professionals. They’re available Monday through Friday, from 9 am to 6 pm EST, ready to provide insights or help troubleshoot issues.

Using these methods, you can easily tap into expert advice for the Ford 7.3 Powerstroke High Pressure Oil Pump, ensuring you have the support you need for your project or maintenance task.

What are the cross-reference part numbers for the Ford 7.3 Powerstroke High Pressure Oil Pump?

Cross-Reference Part Numbers for the Ford 7.3 Powerstroke High Pressure Oil Pump

If you’re looking to replace or cross-reference the High Pressure Oil Pump for the Ford 7.3 Powerstroke, here are the part numbers that you need to know:

04471847
1831449C91
19700191D
2430240006
243-024-0006
2589446C91
2P223
2P-223
501009R91
502559
502-559
739204
739-204
AP63624
DA2251313
DL4408
DT730008R
DT73HPP4
EXHTP108
F81Z9A543CRM
F81Z-9A543-CRM
FS20204
HP008X
HPI2
HPOP008X
HPP400
HPP4RM
HPP-4-RM
HTP108
R98620008R
SUOHP008X

Whether you’re shopping for a direct replacement or seeking an alternative option, these numbers cover a variety of compatible parts. Be sure to verify compatibility with your specific vehicle model.

What warranty options are available for the Ford 7.3 Powerstroke High Pressure Oil Pump?

Warranty Options for Ford 7.3 Powerstroke HPOP

When considering the purchase of a High Pressure Oil Pump (HPOP) for your Ford 7.3 Powerstroke, you’ll find two main warranty choices:

Standard Remanufactured Option

Warranty Duration: Offers a solid 1-year warranty, providing peace of mind for the first 12 months of ownership.
Product Quality: These pumps are remanufactured to meet, or even surpass, original equipment (OE) specifications, ensuring reliable performance.
Included Components: Comes with a mounting O-ring, making installation straightforward and efficient.

Premium Rebuild Option

Warranty Duration: Elevates protection with a generous 2-year warranty, doubling the assurance provided by the standard option.
Product Quality: Each pump is completely rebuilt to conform to or exceed OE standards, ensuring high performance and longevity.
Included Components: Also includes a mounting O-ring, facilitating an easy setup.

Both options offer dependable warranties and components to fit your installation needs. Choose based on your budget and how much warranty coverage you desire.

What are the pricing options for the Ford 7.3 Powerstroke High Pressure Oil Pump?

Pricing Options for the Ford 7.3 Powerstroke High Pressure Oil Pump

The Ford 7.3 Powerstroke High Pressure Oil Pump is priced at $375. For those interested in paying over time, an installment plan is available. You can opt to pay as low as $34 per month through financing options like Affirm.

This flexible payment plan makes it easier to budget for your purchase without affecting your immediate finances.

What are the shipping details for the Ford 7.3 Powerstroke High Pressure Oil Pump?

Shipping Details for the Ford 7.3 Powerstroke High Pressure Oil Pump

When it comes to receiving your Ford 7.3 Powerstroke High Pressure Oil Pump, here are the key details you should know:

Shipping Requirement: This heavy-duty component necessitates shipping.
Package Weight: Approximately 15 pounds, robustly packaged to ensure safety in transit.
Shipping Cost: Enjoy convenient free shipping, making it straightforward to receive your order without additional charges.

Whether you’re tackling a repair or a complete rebuild, rest assured that your pump will reach you promptly and without hidden costs.

Is there a tool available for quick disconnect of the Ford Powerstroke HPOP?

Beginning with the ’99 model year (Super Duty) 7.3L engines, the high-pressure oil lines feature quick-disconnect fittings. Prior to that, they were threaded. For those working on Ford Powerstroke engines from 1994 to 2007, a specialized tool is available to simplify this task. The Powerstroke HPOP Quick Disconnect Tool is designed to efficiently disconnect the high-pressure oil pump (HPOP) lines on both the 7.3L and 6.0L engines.

This tool is essential for anyone maintaining or repairing these engines, allowing for quick and hassle-free disconnection. Whether you’re dealing with the updated quick-disconnect fittings or the earlier models, having the right tool can make all the difference in both time and effort.

Which models and years of Ford Powerstroke engines does the tool support?

The tool is compatible with Ford Powerstroke 7.3L and 6.0L engines from the years 1994 to 2007.

Is there a tool available for quick disconnecting the HPOP on Ford Powerstroke engines?

Yes, there is a newly available tool designed for the quick disconnection of the High-Pressure Oil Pump (HPOP) on Ford Powerstroke engines.