Rajan Wilcox
The DT466 engine has HEUI injectors, so it is important to ensure that the injectors are not dry before starting the truck. If you destroy your injectors, it can be very expensive. To prime a DT466 fuel filter, you should have a small hand pump primer near the filter. You push the primer until it gets hard to push, then bleed the air from the Schrader valve. This process can take time, so it is important to be patient and not rush. You might also need to turn the plastic part about a quarter to half a turn counterclockwise, and then reseat it by pushing down and turning it clockwise. If this doesn't work, you may need to use a battery charger and crank the engine for a few seconds before bleeding the air off and repeating until no more bubbles appear.
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What You'll Learn
Cleaning the rock catcher
The rock catcher is a prefilter that has a plastic filter bowl just before the spin-on filter. It is around 1-1.5 inches in diameter and about 2 inches long. It will most likely be painted the same colour as the engine. It is a plastic spin-on component designed to catch any large debris before it enters the fuel filter.
To clean the rock catcher, you will need to remove it from the engine. Once removed, you can clean the rock catcher with brake cleaner. Ensure that you clean everything, including the O-ring on the bowl. Inspect the O-ring for any damage and replace it if necessary.
The screen inside the rock catcher is reusable as long as it is not damaged. If the screen is damaged, you will need to replace it. After cleaning or replacing the screen, reassemble the rock catcher and install it back onto the engine.
It is important to keep the rock catcher clean and in good condition to ensure the proper functioning of the fuel system. Regular cleaning and maintenance of the rock catcher can help prevent issues with the fuel filter and improve the overall performance of the engine.
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Replacing the O ring
When replacing the O-ring, it is important to ensure that the new O-ring is in good shape and free of any defects. Clean the area where the O-ring will be installed with brake cleaner or a similar product. Check the rock catcher, a prefilter with a plastic filter bowl, and ensure its screen is reusable and free of damage. If the rock catcher is in good condition, simply clean it with brake cleaner.
The O-ring should be replaced on the Quick Connect fitting where the fuel line plugs into the filter housing. Over time, the O-ring can develop hammer flats spots, which can cause air to enter the fuel system. To prevent this, a zip tie can be used to keep the O-ring snug and reduce hammering.
When replacing the O-ring, be sure to purchase a new one from a reputable source, such as Carquest or NAPA. This will cost around one to two dollars but can save you a lot more money in the long run.
Additionally, it is important to note that DT 466 engines have HEUI injectors. Therefore, it is crucial to not start the truck with dry injectors as it can be an expensive mistake. Always prefill the filter before starting.
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Bleeding the Schrader valve
To prime a DT466 fuel filter, you should have a small hand pump primer near the filter. Push the primer until it gets hard to push, then bleed the air from the Schrader valve. The Schrader valve looks like a small tire stem valve and it should have a cap on it. This will take time, so don't rush it. Do this until the fuel has no more air in it.
If your hand primer pump doesn't fill an empty fuel filter in 30 pumps, it's bad. New pumps should take less than 50 pumps before diesel without air is coming out of the bleeder screw. If your hand primer pump is bad, you will need to replace it.
If your hand primer pump is working but you still can't get the engine to start, unplug the injector harness where it passes into the valve cover. Then crank the engine for a few seconds, get out and bleed the air off and repeat until no more bubbles appear, just like bleeding brakes. After you have fuel with no air, plug in the harness and start the truck, letting it idle for a few minutes before road testing.
If you do the crank method, you will have a check engine light and will need to clear the codes or have a shop do it if disconnecting the battery for a few minutes doesn't work.
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Using a hand primer pump
If you are using a hand primer pump to prime a DT466 fuel filter, there are a few things to keep in mind. Firstly, the DT466 engine should have a primary and secondary fuel filter. The primary filter is the one that usually plugs up. This is the filter you will be focusing on when priming.
To start, locate the hand primer pump. It should be on the negative side of the lift pump. If your hand primer pump does not fill an empty fuel filter in around 30 pumps, it may be faulty. A new pump should be able to fill the filter in less than 50 pumps, and you should see diesel without air coming out of the bleeder screw. If your pump is not working properly, you may need to replace it.
When priming, make sure to follow the correct procedure to avoid introducing air into the fuel system. If you notice any fuel leaks from the primer pump, such as fuel coming out from under the plunger cap, this could be a sign that air is getting into the system. Address any leaks before continuing.
Additionally, if you are experiencing issues with the fuel system, such as the primer button remaining spongy even after multiple pumps, it could be an indication that the fuel filters need to be replaced. It is recommended to consult a mechanic or a specialist for further guidance if you are unsure about any steps or if you continue to experience problems.
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Refilling the filter
To refill the filter, you must first locate the hand pump primer, which is usually found near the filter. It resembles a shotgun shell. Push the primer repeatedly until it becomes difficult to push further. Then, bleed the air from the Schrader valve—this looks like a small tire stem valve and typically has a cap on it. You may need to turn the plastic part counterclockwise by a quarter to half a turn, but be gentle to avoid damaging it. After bleeding the air, push down and turn the plastic part clockwise to reseat it.
If your hand primer pump fails to fill an empty fuel filter after 30 pumps, it may be faulty. You can test this by placing it in a bucket of water. If your pump is defective, you will need to replace it.
After refilling the filter, you may need to repeat the process several times after each cranking period. Ensure you do not start the truck with dry injectors, as this can be costly.
It is also important to clean the rock catcher, a prefilter that captures large debris before the fuel enters the main filter. Clean this with a brake cleaner and inspect the O-ring on the bowl for any damage. Replace the O-ring if necessary.
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Frequently asked questions
To prime a DT466 fuel filter, you need to use a hand pump primer. Push the primer until it gets hard to push, then bleed the air from the Schrader valve.
The hand primer pump is usually located near the filter and resembles a shotgun shell.
If your hand primer pump is not working, it may be faulty. Try testing it in a bucket of water. If it is faulty, you may need to replace it.
A rock catcher is a prefilter that catches large debris before it reaches the fuel filter. It is a plastic filter bowl with a reusable screen. Clean it with brake cleaner and ensure the O-ring on the bowl is in good shape.
Ensure your fuel tank is rust-free. If there is rust in your fuel, you may need to drain and replace the tank. Do not start the engine with dry injectors, as this can be expensive. Prefill the filter and ensure all connections are secure to prevent air from entering the fuel system.
