Regan Brown
Changing the secondary fuel filter on a Cat C7 engine is not an easy task. The filter is located on the engine, and to change it, you will need a strap wrench and plenty of patience. The Caterpillar manual primer pump is the best and safest way to go, although it can cost around $100.
There are a few things to consider when changing the secondary fuel filter on a Cat C7 engine. Firstly, if your coach does not have a fuel shut-off valve before the primary fuel/water filter, make sure the fuel tank is full or nearly full. Secondly, remove the primary filter first, plug the centre hole in the new filter, and slowly fill it with clean fuel. Install the new filter, start the coach, and let it run. Use the same process for changing the secondary filter.
Some people choose to pre-fill their filters with diesel fuel, while others prefer to put nothing in the filter. If you choose to pre-fill, make sure to only fill the small outer holes, as the centre hole is the outlet. You can also use duct tape to cover the centre hole while filling.
| Characteristics | Values |
|---|---|
| Fuel filter location | Bottom of the fuel tank, between the fuel line and bottom of the tank |
| Fuel filter type | Secondary or final fuel filter |
| Fuel type | Diesel |
| Filter filling | Caterpillar's official position is to install filters dry if you have a manual primer pump. If not, fill the small outer holes with clean diesel, being careful not to get any in the centre hole. |
| Filter priming | Caterpillar C7 does not have the ability to pump fuel if the secondary fuel filter runs dry. |
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What You'll Learn
The secondary fuel filter is mounted on the engine
When changing the secondary fuel filter, it is recommended to fill the filter with diesel fuel before installation. This can be done by slowly filling the small outer holes, which are the inlet, while being careful not to get any fuel in the centre hole, which is the outlet. Alternatively, a manual primer pump can be used to fill the filter after installation.
It is also important to note that the engine may not start if the secondary fuel filter runs dry. Therefore, it is crucial to ensure that there is fuel in the line from the filter to the pump. Additionally, over-tightening the fuel/water drain valve can cause the sealing washer to slice and leak, leading to the primary filter running dry and the engine stalling.
Some coaches may not have a fuel shut-off valve, so it is recommended to park the coach with the fuel tank uphill from the filters to prevent fuel from siphoning back into the tank when the primary filter is removed.
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You will need a strap wrench and a lot of patience
Changing the fuel filter on a Cat C7 engine is no easy task. You will need a strap wrench and a lot of patience. The secondary fuel filter is mounted on the engine, and you will need to exercise caution when removing it to avoid spilling its contents. The filter is typically located at the top of the engine and may be mounted upside down, which can make the process even more challenging.
To access the secondary fuel filter, you may need to remove the floor under the bed or open a panel, as it is often not easily accessible. It is important to have a manual primer pump when changing the fuel filter. This can be purchased from Caterpillar and installed by replacing the block-off plate held by two bolts on the secondary filter head. The manual primer pump is the best and safest way to change the fuel filter, although it is an additional expense.
When changing the secondary fuel filter, it is recommended to change the primary filter first. Start the engine, then change the secondary filter, and start the engine again. This procedure will make the process easier and help the engine start more smoothly.
Additionally, it is important to ensure that the fuel tank is full or nearly full before changing the fuel filter. The fuel level should be at or above the level of the primary fuel filter to prevent the fuel from siphoning back to the tank when the primary filter is removed. This can cause air to enter the system, making it difficult to prime the engine.
Overall, changing the secondary fuel filter on a Cat C7 engine requires careful planning, the right tools, and patience to ensure a successful outcome.
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You can buy a manual primer pump from CAT
The manual primer pump from CAT costs around $100 and can be purchased directly from CAT. This is a worthwhile investment as it makes changing the secondary fuel filter a much simpler task.
Some C7 Cat engines may not have come with a manual primer pump, and it is possible to change the fuel filter without one. However, this method is not recommended by Caterpillar and can be risky. If you choose to change the fuel filter without a manual primer pump, it is important to ensure that the level of fuel in the tank is at or above the level of the primary fuel filter. If the fuel level is too low, air will be introduced into the system, making it difficult for the fuel pump to prime.
Additionally, when changing the fuel filter without a manual primer pump, it is important to fill the filter properly. The small outer holes are the inlet, and the center hole is the outlet. Fill the outer holes with clean diesel fuel, being careful not to get any fuel in the center hole. This process should be done slowly and carefully to avoid any spills or messes.
By following these steps and using the manual primer pump from CAT, you can safely and effectively change the secondary fuel filter on your C7 Cat engine.
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You can fill the filter with diesel fuel, ATF fluid, or kerosene
When changing the secondary fuel filter on a Cat C7 engine, you may be considering filling the new filter with diesel fuel, ATF fluid, or kerosene. While some people choose to install new filters dry, others argue that this is risky and can lead to issues with starting the engine.
If you do decide to fill the new filter, it is important to only fill the small outer holes, which are the INLET, and not the center hole, which is the OUTLET. You can use a plastic plug to block the center hole while filling. This process ensures that the fuel is properly filtered when the engine is started.
Some people recommend using only clean diesel fuel to fill the filter, as other fluids may not be compatible with modern high-pressure common rail injection engines. Additionally, the heavy additive packages in fluids like ATF can find their way into your injection pump and injectors, which is not desirable.
If you do not have a manual primer pump, filling the new filter with diesel fuel, ATF fluid, or kerosene can aid in priming the fuel system and make it easier to start the engine after the filter change. However, it is important to note that introducing any contaminants into the filter during the filling process can lead to issues. Therefore, it is recommended to use a sealed container of fluid to fill the filter.
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$921.99
You can also leave the filter empty
It is possible to leave a secondary fuel filter empty, though it is not recommended by the manufacturer. Some people have reported success with this method, but it is important to note that this may not work for all vehicles and could potentially cause damage to the engine.
If you decide to leave the secondary fuel filter empty, it is important to monitor the engine's performance and fuel system for any issues. It is also recommended to have a backup plan, such as a way to drain the bowl if the water indicator and buzzer go off, as there is an increased risk of water getting into the fuel system.
One reason why someone might choose to leave the secondary fuel filter empty is if they have upgraded their fuel filters and the secondary filter is no longer needed. In this case, the secondary filter can be left in place as a moisture catcher, but it should be inspected regularly to ensure that it is not causing any restrictions in the fuel flow.
Another reason to leave the secondary filter empty is if you have a Caterpillar secondary fuel filter base. In this case, you can replace the block-off plate with a manual primer pump, which will help to ensure that the engine has enough fuel pressure to run properly. Without the manual primer pump, it is recommended to fill the filter with clean diesel fuel to avoid issues with air in the system.
Overall, while it is possible to leave a secondary fuel filter empty, it is important to carefully consider the potential risks and take appropriate measures to mitigate them. Regular inspection and maintenance of the fuel system are crucial to ensure the engine's performance and longevity.
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Frequently asked questions
The secondary fuel filter on a C7 Cat is located on the engine. Caterpillar's official position is to install filters dry if you have a manual primer pump. If you do not have a manual primer pump, fill the filter with diesel fuel.
The secondary fuel filter on a C7 Cat is located on the engine.
It depends. If your C7 Cat has a manual primer pump, you do not need to fill the filter with diesel fuel. If it does not have a manual primer pump, you should fill the filter with diesel fuel.
