Tech Tips: High Pressure Oil Pump Overview for Ford and Navistar Engines

When discussing oil pumps, most people think of the component inside the oil pan that supplies oil to the bearings in the crankshaft, but with a high pressure system, you actually have two oil pumps on your engine. What we're talking about today is the high-pressure oil pump that supplies the fuel system.

Click To Talk Directly To A Diesel Engine Expert 8-5 EST

Common Oil Pump Questions For Ford Powerstroke And Navistar Diesel Engines

We're going to take you through a genuine Bosch high-pressure oil pump for your Ford Powerstroke 7.3L and your Navistar International T444E and cover some questions we often see about this component.

This high-pressure oil pump or "Hpop", was designed for high pressure fuel injection systems. Bosch begin production of these in 1995, and it was an evolution driven by emissions requirements.

What Are The Benefits of High Pressure Oil Pumps?

High Pressure Diesel Oil PumpYou see a lot of benefits from high pressure systems, including:

  • Low Emissions

  • Better Fuel Consumption

  • Simple and Fast Pump Replacements

On older engines, the system was a lot more complicated. These engines would have a large mechanical pump on the side of the engine and the system was almost like a mini engine with a lot of moving parts inside. All of these components created more opportunities for failure.

With a high pressure system we've gotten rid of the rotating parts, and now we have a pump that transmits its pressure via hydraulics. So instead of relying on a camshaft for mechanical transmission of power, you've got hydraulic transmission of power.

What are Common High Pressure Oil Pump Failures?

But what about failures? There are some places where you might run into problems with your high-pressure oil pump.

  • It runs off the same oil that the rest of the engine uses

  • There's a cross in operation where fuel and oil can run together

  • Engine burning more oil

  • Bad fuel mileage, worn out injectors

  • Fuel dilution

  • Oil leaks

It's important to pay attention to oil change intervals because it's all the same oil, breaking down more quickly. You might be getting more contaminants in your oil.

Your engine might be starting to burn more oil, and suddenly there might not be enough oil in the system, and you'll notice your engine running poorly. You'll be getting bad fuel mileage and your injectors can wear out more quickly.

There are a lot of opportunities for failures, if you don't have the proper lubrication.

Over time, you can also get fuel dilution. By using the same oil throughout the engine, it can get thinned out and cause problems. It's also not uncommon to have leaks. If you have a leak, you'll be dropping pressure which can affect your injection pressure, your injection timing, and all kinds of different things.

Shop High Pressure Oil Pumps!


On engines like the Ford Powerstroke and the Navistar International T444E that use high pressure oil pumps, you'll likely see:

  • A quieter ride

  • Lower emissions

  • Better fuel economy

  • Higher torque

  • Clean and efficient fuel injection

  • High engine performance

When you buy a genuine Bosch oil pump from HHP you'll be getting a genuine OE replacement part. The same part as the OE supplier! It's also backed by an industry leading warranty, and we have ASE certified technicians to help take the risk out of the buying parts.

If you have any questions about your diesel oil pump or any other parts, you can call our ASE Certified parts technicians at 844-447-1453. Or you visit our website at!

Short On Time? Get Your Quote Online!

Oil Pump and Oil Cooler Resources

Related Articles:




Related Videos:

Give Us A Call!


Short on Time? Take your Quote Online!

We get it- when you need Diesel Engine Parts, time is of the essence. That's why we've developed the HHP Online Quoting System.

Just fill out the form with your name, engine information, and the parts you need, and our ASE-Certified Technicians will get back to you with an estimate. It's as close to magic as a diesel engine gets!

Get A Quote Online!