Regan Brown
If you're looking to drain the primary fuel filter on your 2008 F350, you've come to the right place. This guide will take you through the process step-by-step, ensuring that you can get the job done safely and effectively. It is recommended to refer to the Owner's Manual provided with your vehicle as the primary source of information. The process of draining the primary fuel filter involves several steps, including accessing the underside of the vehicle, locating the diesel fuel conditioner module, properly draining the module and filter, and priming the system. It is important to follow the correct procedures to avoid any issues and ensure the optimal performance of your F350.
| Characteristics | Values |
|---|---|
| Vehicle | 2008 F350 6.4L |
| Fuel Filter Type | Frame-mounted filter |
| Fuel Type | Diesel |
| Mileage | 40,400 miles |
| Fuel Tank Level | Below 1/4 tank |
| Tools Required | 36mm socket, small swivel extension, ratchet, wrench |
| Drain Plug Type | Yellow drain plug |
| O-ring | Lubricate with oil |
| Fuel Drained | Approximately 0.5 gallons (2 liters) |
| Priming | Turn key to the on position for 30 seconds, repeat cycle 6 times |
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What You'll Learn
Locating the diesel fuel conditioner module
The diesel fuel conditioner module is located between the outboard side of the fuel tank and the frame rail. The module is at the front of the fuel tank or at the front of the aft-axle fuel tank on some models.
The Horizontal Fuel Conditioning Module (HFCM) is a black box found under the hood. It houses the fuel pump, a fuel filter, and a water separator. The HFCM pumps fuel up to the upper housing from the tank, after which the high-pressure pump takes over. The four lines that connect to the HFCM are:
- The fuel supply line from the fuel tank
- The fuel return line from the high-pressure fuel pump
- The vacuum line for the fuel pump
- The vent line for the fuel tank
To drain the diesel fuel conditioner module, first turn the ignition on for 30 seconds and then turn it off. Repeat this operation six times in a row to purge any trapped air from the fuel system. Next, turn the drain plug counterclockwise until it stops. Do not use any tools to loosen the drain plug. Drain the filter into an appropriate container. Approximately 2 litres of fuel will be drained. Do not reuse the drained fuel.
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Draining the diesel fuel conditioner module
To drain the diesel fuel conditioner module of your 2008 F350, follow these steps:
Firstly, switch off the engine and access the underside of your vehicle. The diesel fuel conditioner module is located on the left-hand frame rail. Place an appropriate container under the drain port of the module.
Next, turn the drain plug counterclockwise until it stops. Do not use any tools to loosen the drain plug. Allow the module to drain for approximately 25 seconds or until clean fuel is observed. You can expect to drain approximately 0.5 gallons or 2 litres of fuel.
Once the module has drained, rotate the drain plug clockwise to tighten it. Do not use any tools to tighten the drain plug.
Finally, prime the system by turning the key to the 'on' position for 30 seconds. Then, turn the key to the 'off' position and repeat the process of switching the key to the 'on' position for another 30 seconds. Repeat this cycle twice.
It is important to note that you should not reuse the fuel drained from the module. Additionally, refer to your owner's manual for further information and instructions specific to your vehicle.
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Removing the filter cap
To remove the filter cap, you will need a 36mm socket, a ratchet, and a small swivel extension. Place a rag over the frame rail to catch any diesel fuel that may leak when taking off the primary fuel filter cap. You will need to push the wire loom to get the cap off. Once the cap is off, wash it with gas and blow-dry it with a compressor—do not use a rag or paper towel, as these can leave lint.
Next, you will need to lubricate the new primary fuel filter's O-ring with oil and put the filter in first, turning it so that it goes in as far as possible. Then, lubricate the primary fuel filter cap O-ring and threads with oil, place the cap over the filter, and hand-screw it on. Finally, torque the filter cap to 18.5 ft/lb.
Note that it is recommended to have the truck off for a while before starting this process, so there is not a lot of pressure in the fuel lines. Additionally, the water separator valve below the chassis by the primary fuel filter should be opened and left open, allowing the fuel to drain.
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Cleaning the filter caps and mounting areas
To clean the filter caps and mounting areas, you will need to remove the filters. Start by removing the engine-mounted filter. Slowly pull it out, allowing the fuel to drain back. Next, open the drain on the HFCM (Horizontal Fuel Conditioning Module) mounted on the inside of the frame rail under the driver's side and let it drain into a container.
Now, you can take off the filter caps with a 36mm socket. Clean both the filter caps and mounting areas thoroughly. You can wash the caps with gas and blow-dry them with a compressor. Do not use a rag or paper towel as these can leave lint.
Once the caps and mounting areas are clean, you can replace the O-rings and lubricate them with fuel. Then, install the new filters into their caps and put them back onto the truck.
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Replacing the O-rings
When replacing the O-rings, it is important to ensure that the fuel in the fuel bowl is clean and that the bowl itself is not leaking. You can source replacement O-rings from specialist websites or local hydraulic cylinder repair shops.
To replace the O-rings, first, drain the fuel from the filter housing. You can do this by locating the drain valve behind the filter housing and moving the yellow lever to the right. Once the fuel has drained completely, remove the old O-rings from the back of the valve using a pick tool.
Next, push the new O-rings into place. Make sure that the bevelled side of the large O-ring is facing up, with the flat side in the groove at the top of the housing. Put some oil on the new O-ring for the cap. Finally, push the wire loom to get the cap off and on.
After replacing the O-rings, cycle the key but do not start the engine for at least six times for at least 30 seconds each to purge the air. Then, start the engine and let it run for about 60 seconds to allow the fuel pump to fill the filter housing back up.
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