Fuel Injection Mechanisms

In the functioning of diesel engines, injection pumps pump diesel into the cylinders. In regular diesel engines, injection pumps rotate at roughly half the speed of the crankshaft. The process is timed such that minimal fuel is injected with each cylinder’s compression stroke. The injection pump belts contained in gasoline engines are commonly driven by camshafts. Let’s focus on the factors to consider when choosing fuel injection mechanisms.

How diesel injector pumps work

In a majority of diesel engines, the air is compressed to 1/20 of its actual volume when diesel fuel injection happens. As the air-fuel mixture becomes hot enough, it provokes the expansion of a cylinder in the engine. No heat is in or out of the engines; this is done in the exhaust instead. A majority of fuel injection systems are composed of nozzles, injection pumps, and fuel lines. As a result of air compression, cylinder pressure rises to 600 pounds per square inch, pushing internal temperatures up to 1200F. Diesel engines are more reliable, efficient, pose less of a fire hazard, and produce more power per metric quantity of fuel. It is important to remember that diesel engines are heavier than their gasoline counterparts due to the diesel being made from crude oil residue.

Benefits of fuel injection

  • In fuel injection engines, a more precise quantity of fuel is delivered to all the cylinders.
  • Fuel injection engines produce more power compared to other fuel delivery systems
  • Engines that utilize fuel injection are highly efficient
  • Fuel injection engines produce less pollution from fuel burning.

When to consider replacing fuel injectors

For a majority of stock engines, injectors function at only 80% capacity. With the addition of aftermarket parts, engines usually process a larger amount of air. This means that injectors only need to handle 20% extra load. As soon as engines begin to process more air, fuel injectors will not be able to keep the fuel flow sufficient to keep engines from running lean. At this point, owners should consider upgrading the vehicle’s fuel delivery mechanisms.

Factors to consider when choosing fuel injection mechanisms

Many engines run rough due to the wrong selection of fuel injectors, as well as running the risk of totally ruining engine components. When selecting fuel injector, it is based to consider factors such as:

  • Size

When picking fuel injectors, take the size into account, as this determines the amount of horsepower that is generated with each modification to the engine system.

  • Running lean

Engines can be well modified, but fuel injectors may fail to deliver sufficient fuel. Whenever you upgrade systems like higher flowing fuel pumps, turbo, and larger exhausts, it is important to increase the size of the fuel injectors accordingly. If this is not properly done, the vehicle will be running lean, making it sluggish and underproducing power. This situation can also lead to burnt-out pistons and a destroyed motor.


Injection pumps are great at controlling the rate at which fuel is delivered to your engine. When choosing good injection pumps, consider the size and possibility of running lean.


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