How do you bleed air out of a 6.5 diesel?

Asked By: Jhosua ComesaƱa | Last Updated: 8th March, 2020
Category: automotive auto parts
3.9/5 (230 Views . 21 Votes)
Place the opposite end of the hose in a fuel safe container. If the engine will run, start the engine and bleed any remaining air from the system by slightly opening the T-handle bleed valve until a steady stream of fuel flows out of the hose. Close the valve once this is achieved.

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In this regard, how do you get rid of an airlock in a diesel engine?

To start the process, locate the manual fuel pump primer on the engine. This may be a small lever you pump up and down, or a plunger-type you push in. Open up the bleed screw on top of the secondary fuel filter, and start pumping the primer pump. You will likely see both fuel and bubbles coming out of the bleed screw.

Subsequently, question is, is it bad to let a diesel run out of fuel? Nothing will be damaged if you run out of diesel, but the injector pumps don't work if there's even the smallest amount of air in them. Therefor it will be necessary to bleed the air completely from the fuel lines and injector pumps before the engine will start and run properly.

Similarly, you may ask, what happens if you get air in your fuel line?

Fuel lines containing air can cause the engine to not run properly. Generally, air is introduced to the fuel lines when there is a leak or during fuel draining for equipment storage. Very little mechanical knowledge is required when bleeding fuel lines.

Should there be air bubbles in diesel fuel line?

If there are no air leak symptoms, but bubbles are present in a sight tube at the fuel lift pump inlet, they are most likely vapor bubbles. All diesel fuel has some level of entrained air caused by the natural splashing that occurs in the fuel tank during normal vehicle or equipment operation.

33 Related Question Answers Found

What causes air lock in diesel engine?

Air locks are caused by air leaking into the fuel delivery line or entering from the tank. Air locks are eliminated by turning the engine over for a time using the starter motor, or by bleeding the fuel system. Modern diesel injection systems have self-bleeding electric pumps which eliminate the air lock problem.

How do you prime a diesel?

How to Prime a Diesel Engine
  1. Get a good mechanic's repair manual.
  2. Look the fuel system over and check for any obvious air leaks.
  3. Fill your fuel filters with clean diesel and replace them.
  4. Take off the primer handle from the injector pump and pump it until you get fuel pressure on the system.

How do you prime a diesel injector pump?

How to Prime a Diesel Injector Pump
  1. Loosen the nuts connecting the injectors to the motor head.
  2. Insert the key into the ignition.
  3. Listen for the vehicle's electric lift pump to begin transferring diesel from the fuel tank to the fuel filter housing and, in turn, the injector pump.

Will air in the fuel line symptoms?

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.

How does air get into a diesel fuel system?


Simple fuel systems use gravity or air pressure to get fuel from the tank to the injection pump. On modern high speed diesel engines, a fuel transfer pump is normally used. This pump, driven by the engine, supplies fuel automatically to the diesel injection system.

How do I get air out of my coolant system?

How to Bleed a Cooling System That Doesn't Have a Bleed Screw
  1. Remove the radiator cap.
  2. Fill the radiator with a 1-1 ratio mixture of distilled water and antifreeze up to the bottom of the radiator neck.
  3. Add coolant to the reservoir container to bring the level up to the "Cold" mark as well.

How much coolant does a 6.6 Duramax?

6.6L Duramax Fluid Specifications & Capacities
Engine oil 15W-40 10 qts w/ filter change
Transfer case fluid 2001-2007 manual shift 2.0 qts
2001 - 2007 auto shift 2.0 qts
2008 - 2016 1.6 qts
Front differential fluid 2001 - 2010 1.8 qts

How do you bleed a Duramax power steering?

Turn the engine OFF.
  1. Raise the vehicle until the front wheels are off the ground. Refer to Lifting and Jacking the Vehicle .
  2. Key on engine OFF, turn the steering wheel from stop to stop 12 times.
  3. Verify power steering fluid level per operating specification.
  4. Start the engine.
  5. Verify the fluid level.

What temperature should a Duramax run at?

Anything under 235 is normal temp for these engines, and is where they are designed to run. As for the trans, anything under 220 or so is fine. Even 220 isn't bad if your towing. if it has the factory DEX VI in it, it is good to around 235-240 without much breakdown.

How do you get rid of an airlock?


The first way to clear an airlock, involves attaching a hose pipe to the hot and cold taps at a sink in your home and turning the cold tap on so that the water flows through the hose pipe, into the hot water tap, removing the air.

Why do you have to bleed a diesel engine?

Once you fill the fuel tank with diesel fuel you need to remove the air bubbles from the fuel lines/fuel injectors, a process known as “bleeding the system.” Once you fill the fuel tank with diesel fuel you need to remove the air bubbles from the fuel lines/fuel injectors, a process known as “bleeding the system.”

What causes a pump to air lock?

An air lock (or vapor lock) is a restriction of, or complete stoppage of liquid flow caused by vapour trapped in a high point of a liquid-filled pipe system. The gas, being less dense than the liquid, rises to any high points. Note that circulating pumps usually do not generate enough pressure to overcome air locks.

How do I know if engine has vapor lock?

Hold the accelerator down when the vehicle starts until the engine is running smoothly. The engine will sputter for a few seconds until the vapor lock is cleared from the lines.

How do you bleed injectors on a 6.5 turbo diesel?

With the bleed orifice on the fuel filter open, crank the engine over for no more than 10 seconds, then position the key to the "OFF" position and allow the starter to cool for 60 seconds.

What is vapor lock in an engine?


It's a uniquely modern problem. Vapor lock happens when your fuel boils in your carburetor or your fuel line. Vaporized fuel creates back pressure in your fuel system and prevents gas from getting to your engine. It commonly occurs when a car has been idling or has been turned off and then back on.

How do you bleed fuel lines on a small Yanmar Diesel?

How to Bleed Air From a Yanmar Diesel Fuel System
  1. Turn the fuel control valve to the "On" position.
  2. Loosen the air bleed screw on the top of the fuel filter canister with a screwdriver.
  3. Loosen the fuel return pipe bolt with a wrench at the last injector before the pipe re-enters the fuel pump.
  4. Loosen the air vent screw at the injector pump with a screwdriver.

How do you know if your fuel injectors are clogged?

If a clogged fuel injector continually struggles to disperse fuel to the engine, a time will come when it misses the fuel supply completely and the engine will misfire. The misfire will easily be felt while driving, and often requires immediate repair by trained automotive repair specialists.