How to Prime a Diesel Engine

Prime a diesel engine is the process of filling the engine with working fluid ( diesel) and removing the contaminants present in the diesel.

To Start a Diesel When it Runs Out of Fuel, if a diesel-powered truck runs out of fuel, the easiest way to start with no air in the fuel line is to just get some diesel and put it in the tank, which will restart the truck. However, if you have to do some work on the fuel system, that's not going to happen. If the fuel lines are full of air, the diesel will not pull fuel from the tank to the engine and when this flow is interrupted by air bubbles, a symptom known as "air lock" occurs, causing the engine to shut down and refuse to start, so you must first fill the engine fully with fuel before attempting a successful restart. Fill the engine fully with fuel before attempting a successful restart.

Diesel Engine| FAWDE

Why Do We Need To Prime A Diesel Engine?

● High-efficiency fuel utilization: Diesel has a high calorific value and low volatility. It is suitable for compression ignition combustion in a high-pressure environment, thereby improving fuel utilization efficiency.

● Strong power output: Infusion diesel engines usually have higher compression ratios and larger torque output and are suitable for applications requiring large torque output, such as commercial vehicles, heavy machinery, and large vehicles.

● Economy and Durability: Compared with gasoline engines, diesel engines have higher fuel economy and can drive longer miles under the same conditions. In addition, diesel engines generally have a long service life and low maintenance costs.

● Environmental protection and emission reduction: The exhaust gas produced during the combustion process of diesel contains less harmful substances such as hydrocarbons and carbon monoxide, which causes relatively less environmental pollution. At the same time, diesel engines have high combustion efficiency and emit less carbon dioxide.

● Wide adaptability: Infusion diesel engines are suitable for various working conditions and application scenarios, including land vehicles, ships, generator sets, industrial and agricultural machinery, etc., and have a wide range of adaptability and application range.

In general, the infusion diesel engine is an efficient, economical, environmentally friendly, and widely adaptable power device that can meet the needs of various application scenarios and play an important role in various fields.

What you will need

Mechanical repair manual for the engine

Spanner and screwdriver

Diesel engine

Fuel filter

Start the handle pump

Steps of Prime a Diesel Engine

Step 1

Find the operating manual for your product to provide you with all the specific details of your diesel engine. Look in the engine manual for the location of the fuel starter pump and bleed screw. The pump and screw will normally be located somewhere near the engine fuel filter. The starter pump will be a large button, rubber ball or small lever.

position of bleeder screw

Step 2

Carefully inspect the fuel system and check for any obvious air leaks. Fill with clean fuel to perform this operation.

Step 3

Loosen the bleeder screw a few turns. The loose bleed screw allows air to leave the fuel line as the fuel is pulled from the fuel tank to the fuel filter.

STEP 4

Pump the starter pump until the diesel fuel flows out of the loose bleed screw. The starter pump is very small and your fuel line may contain a lot of air, so be prepared to pump for 5 to 10 minutes before you see fuel flowing out of the bleed screw.

Step 5

Tighten the bleed screw with a screwdriver. Try to start the engine normally. You may need to start the engine for 10 to 15 seconds before it starts and runs. If the engine does not start within 15 seconds of starting, repeat the filling process to get more fuel into the fuel filter and pump.

workers of diesel engine 

If you have a need for a diesel engine or have any questions about diesel engines, FAWDE, as a manufacturer of diesel engines, will provide you with quality products and answers!