Your fuel lift pump will be mounted on the engine and connected to the primary fuel filter. Begin pumping the lever or plunger while keeping an eye on the bleed screw. You will see bubbles form as air leaves the system. Use your rags or other absorbent material to sop up the fuel as it bleeds out.
What causes diesel airlock?
When you change a diesel fuel filter, run out of fuel or disturb the fuel system, air is trapped. When you try to start the engine this air acts as a lock, preventing the normal supply of fuel into the cylinder.
What are the symptoms of having air in the fuel line?
Air bubbles in a fuel line can lead to stalling, hiccuping or refusal to start. Keep your fuel lines free of air to help keep your car running smoothly. Air bubbles in a fuel line can lead to stalling, hiccuping or refusal to start. Keep your fuel lines free of air to help keep your car running smoothly.
What happens when air gets in diesel engine?
When air bubbles or vapor are present in your diesel fuel delivery system, fuel injection is delayed. This delay happens because the fuel cannot be injected until the air and vapor are compressed to the correct fuel injection pressure.
How do I prime a diesel engine?
Prime the fuel system by turning the ignition on (Run position) for 30 seconds, but do not start the engine. This allows the pump to prime the system. Turn the ignition off, and then crank it for 15 seconds. If it does not start, repeat the first task and this one until it starts (cycle the key).
How do you get air out of fuel system?
To purge air from the low-pressure side of the fuel system, open fuel-line unions and bleed ports downstream of the pump, one at a time, beginning with those closest to the pump, and continue pumping until fuel, and not air, runs out.
How do you fix an air locked engine?
The simplest remedy for an air lock is cycling the system. Start the engine run it up to temperature, shut it off, allow the engine to cool and repeat as required. Normally 1 or 2 heat cycles will show the level change and topping of indicates the air has moved though the system.
How do you bleed air from a fuel line?
How to Bleed a Gasoline Line
- Fill up the gas tank with fuel.
- Start the engine but do not allow air into the system. Have a friend turn the key in the ignition to “Start” for approximately 3 seconds. …
- Allocate approximately 20 minutes for the engine to sit if flooding occurs while bleeding the fuel lines.