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How To: Change Diesel Fuel Filters


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    • By Counterman
      The fuel system, as a whole, is responsible for delivering fuel from the tank to the engine, then metering it into the combustion chamber. It consists of the tank, the lines, the pump and the metering device. If only it was as simple as it sounds. The challenge lies in the continual changes over the last century, and how the frequency of changes has increased over recent decades.
      The heart and identity of any fuel system is the metering device or system that controls the flow of fuel into an engine. As a counter professional, you’re going to hear it all, and you’ll have to answer it all, so here’s a rundown on the major changes and differences over the years.
      Carburetion Systems
      A carburetor is a basic mechanical device, and the primary metering device used on the earliest automobiles. Carburetors held their ground until the late 1980s, when the last examples were eventually replaced by fuel injection. The job of a carburetor is to not only meter the fuel but also to properly mix it with the air flowing into the engine through the process of atomization.
      As the automotive industry began to migrate to fuel injection, a knee-jerk reaction opposing fuel injection ensued. We were familiar with carburetors, and liked the fact that they were mechanical devices that could be repaired and rebuilt using basic hand tools, and there were no electronics involved. Regardless of who made the carburetor or what style it was, an experienced technician could diagnose and repair a problem without the need for service information, scan tools or electronics.
      Though considered “simple,” carburetors are more complicated than they seem, with multiple different circuits to manage all aspects of engine operation. “Tuning” a carburetor – the art of balancing performance, efficiency and drivability – takes a considerable knowledge of engine operating principles, and the patience and precision to get it right.
      The majority of carbureted vehicles utilize mechanical fuel pumps, driven off the engine. This too adds to the attraction of these vehicles, as again there were no electronics involved. The drawback to carburetors came in their lack of ability for precise fuel control. They simply couldn’t keep up with the tightening noose of emission and fuel-economy standards that was in full force by the 1970s. As the end of their use in production automobiles came near, some electronics were incorporated into them, but ultimately proved ineffective.
      Today, any professional will admit – regardless of complexity – that fuel injection is simply superior and necessary. However, carburetion is still popular on old vehicles, partly because of its relative simplicity, but also due to the popularity of restoring old cars to their original state. While far from commonplace, carburetor rebuild kits aren’t going away anytime soon.
      Fuel-Injection Systems
      The advantage of fuel injection is the ability to precisely control fuel delivery under all operating conditions. Not only is this a necessity for emissions and fuel economy, but it also has a major advantage in drivability – an operational attribute that goes hand in hand with efficiency and performance.
      Attempts at fuel injection are as old as the internal combustion engine itself, but in the early days, too many bugs made it undependable. By the 1950s, substantial engineering efforts were applied to develop fuel injection, both in the United States and Europe. One of the more well-known systems was the original Rochester fuel injection developed by Chevrolet for the 1957 Chevrolet and Corvette.
      The idea behind developing this fuel injection wasn’t in the interest of horsepower or emission control. It was drivability, with the goal to eliminate the undesirable and unavoidable attributes of a carburetor, including fuel slosh in the fuel bowl and the transition between primary and secondary circuits. As you may expect, racers played a substantial part in all this, and the best part is they were very successful, and it unlocked horsepower as well!
      The Rochester fuel-injection system was available from 1957 through 1965, but it ultimately failed for only one reason: cost. It was an expensive option, and with the muscle-car wars in full force and much higher-horsepower carbureted engines available for a fraction of the cost, nobody was buying.
      By the late 1970s, fuel injection was better-developed, and this time emissions and fuel economy played a strong part. It began its rise to the top, and thanks to the advancements in electronic and computer technology, it got there quick. By the early 1990s, carburetion was all but gone from production automobiles.
      Fuel-injection systems can be separated into multiple categories and types, and since you’ll hear multiple terms, here’s how to tell them apart.
      Mechanical Fuel Injection
      Early gasoline fuel-injection systems were mechanical. The pumps were mechanical, and fuel was delivered directly to nozzles located in the intake manifold. The pressure of the fuel caused the fuel injectors to open. A type of air meter was necessary, but early systems relied primarily on vacuum signals or mechanical linkage between the air meter and fuel-distribution meter to determine the proper amount of fuel. Very minimal if any electronics were involved in these systems.
      Early diesel fuel-injection systems were purely mechanical as well, but the difference was the required fuel pressure. It doesn’t require much pressure to inject fuel into an intake manifold, but it requires extremely high pressure to inject fuel directly into a cylinder (such as is necessary for a diesel). Diesel-injection pumps housed a mechanical high-pressure pump to feed the fuel to the injectors.
      One of the most common gasoline fuel-injection systems to become popular beginning in the late 1970s was the Bosch Continuous Injection System (CIS). This, too, was overall a mechanical system, but an electric pump supplied the fuel, and minor electronics played a part in cold-start functions as well as fuel-mixture control.
      Electronic Fuel Injection
      Electronic fuel injection was a terminology that became well-known in the 1980s and was often indicated by the letters “EFI” on the back of a car. It seemed revolutionary at the time, and it indicated that the systems were now completely electronically controlled. It was this point in time when fuel pumps found their way into the gas tank; injectors were basically solenoids that opened the injector upon command from a computer; and the computer – along with a myriad of sensors – controlled everything surrounding the operation of the system.
      Even though EFI was an early term that would now be as redundant as saying you have antilock brakes on a new car, it’s technically still an accurate term. It’s just not used often because it’s assumed – and correctly – that everything on a new car is tied to electronics. EFI is a term that can include many different types of fuel injection.
      Throttle-Body Injection
      Throttle-body injection (TBI) refers to the fuel injector(s) being located in a throttle body that looks almost like a carburetor at a glance. This was done by design, as it was the most efficient and quickest way for auto manufacturers to make the change to fuel injection, while utilizing many of the same components they already had such as the same intake manifolds and air cleaners. TBI was most common in the 1980s and early 1990s.
      We’ve always loved fancy names. Have you ever heard of cross-fire injection? It was two throttle bodies at opposite corners of the intake manifold.
      Port Fuel Injection
      TBI was at a disadvantage because airflow was interrupted by the injector, and port injection was the next advancement in line. Port, or multi-point injection injects fuel into the intake runner just before the intake valve for each cylinder. The advantage is the ability to precisely control the fuel delivery and balance the airflow into each cylinder, leading to increased power output and improved fuel economy.
      Early mechanical fuel-injection systems were port-injection systems, sans electronic control. Seem confusing? Many fuel-injection terms cross over from new to old technology. There are just so many manufacturer-specific names that it can be confusing! Like EFI, port injection was widely advertised as the latest greatest advancement, with tuned port injection topping the performance charts. Port injection still is the most common type of fuel injection used today, but when was the last time you saw it called out? Nobody really says it anymore because it’s not new. But there’s another technology that we’re not done talking about, and that’s direct injection.
      Direct Injection
      Direct means the fuel is injected directly into the combustion chamber. Direct injection has been around for years in the diesel world, but it’s still relatively new for gasoline engines. The challenge with this type of injection is injecting the fuel into the high compression of the combustion chamber. Just like a diesel, it requires extremely high fuel pressure, and gasoline direct injection utilizes a typical electric pump to supply fuel to the rail, plus a mechanically driven high-pressure fuel pump to supply the necessary pressure for injection.
      The primary advantage of direct injection is that there’s less time for the air/fuel mixture to heat up since the fuel isn’t injected in the cylinder until immediately before combustion. This reduces the chance of detonation, or the fuel igniting from the heat and pressure in the cylinder. This allows a direct-injected engine to have higher compression, which itself lends to higher performance.
      There are additional advantages of reduced emissions and better fuel economy, but there also are some now-familiar drawbacks, including carbon buildup on the backs of the intake valves, low speed pre-ignition and limited high-rpm performance. For this reason, many manufacturers are combining both direct- and port-injection systems.
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    • By Dorman Products
      Why auto mechanics should check cabin air filters in every vehicle
    • By Counterman
      Standard Motor Products (SMP) continues to expand its gasoline fuel-injection program, which now has more than 2,100 part numbers.
      The program features more than 1,100 all-new gasoline direct injection (GDI), multi-port fuel injection (MFI) and throttle-body injection (TBI) injectors, as well as fuel-injector multi-packs for a complete repair solution, according to the company.  
      New fuel injectors manufactured by SMP are built in the company’s IATF 16949-certified facility in Greenville, South Carolina. Standard new fuel injectors are extensively tested at the Greenville facility for flow and spray pattern and durability to ensure that they match OE-designed performance in all conditions, according to SMP.  
      In addition to injectors, the Standard program includes high-pressure fuel pumps and kits, fuel-injector rail kits, fuel-pressure sensors, fuel-feed lines, fuel-pressure regulators, GDI service kits, fuel-pressure sensor connectors and camshaft followers, with coverage for import and domestic vehicles through the 2023 model year.
      Standard recently launched its line of direct-injection high-pressure fuel pump kits for popular import and domestic applications.
      “These award-winning kits simplify high-pressure fuel pump replacements by including everything needed for a complete repair: a high-pressure fuel pump, camshaft follower and any additional components needed based on the manufacturers’ repair procedures,” the company said in a news release. “These complete kits are designed to save technicians’ time and ensure that the job is done correctly the first time with all-new components.”
      New Coverage
      SMP recently released multiple new GDI and MFI Injectors, offering coverage for millions of Ford, Hyundai, Audi, Honda, Infiniti and Volvo vehicles.
      Popular applications include the 2022-2021 Ford F-150, 2023-2021 Hyundai Elantra, 2021-2019 Honda Insight and 2019-2017 Infiniti Q60.
      Several fuel-pressure sensors have been introduced, adding new coverage for popular vehicles such as the 2023-2022 Jeep Grand Cherokee and 2013-2006 Honda Civic.
      Fuel-feed lines are new for nearly 1 million Audi and Volkswagen vehicles, as well as the 2018-2013 Nissan Altima, 2020-2019 Toyota RAV4 and more.
      Fuel-pressure sensor connectors have been released for Ford vehicles through 2021 and Jeep vehicles through 2023.
      “Our fuel-injection program includes all of the parts technicians are looking for to perform a complete, start-to-finish repair,” said John Herc, vice president of vehicle control marketing for SMP. “Standard is committed to continued expansion to maintain the most complete line in the industry.”
      All new Standard fuel-injection applications are listed in the e-catalog found at
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    • By Dorman Products
      Fuel Tanks | Counterperson Training from Dorman Training Center
    • A-premium Auto Parts:5% OFF with Code GM5.
    • By Dorman Products
      Fuel Lines | Counterperson Training from Dorman Training Center

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