Replacing Primary Racor Fuel Filter: Step-By-Step Guide

Changing a primary Racor fuel filter is a straightforward process that can be completed in a few hours. It is important to note that different engines have different types and styles of filters, so it is crucial to refer to the manufacturer's instructions. The first step is to turn off the fuel petcock and place a suitable receptacle under the primary filter to collect any spilled fuel. The next steps involve unscrewing the T-handle, removing the old filter element, draining the sediment, and cleaning the mating surfaces. The new filter is then dropped into the housing, filled with fresh fuel, and the new gasket and O-rings are carefully reseated. The primary filter process is followed by attention to the secondary filter(s), which are usually mounted on the engine. Finally, the fuel system is bled, the engine is started, and any leaks are checked.

Draining the filter

The next step is to unscrew the T-handle on top of the filter and remove the cap. If you have a Parker Racor filter, simply lift out the old filter element and place it into a plastic bag for proper disposal. For other filter types, refer to the manufacturer's instructions.

After removing the filter element, open the petcock on the bottom of the filter to drain any water and dirt into a clear receptacle. This will allow you to inspect the fuel for trash or water. Remember to retighten the petcock after draining. If the fuel is extremely dirty, simply draining it may not be sufficient, and you may need to disassemble the bowl for a more thorough cleaning.

By following these steps, you will effectively drain the primary Racor fuel filter, preparing it for a new filter element.

Removing the filter and bowl

To remove the filter and bowl of a primary Racor fuel filter, first turn off the fuel petcock (if fitted) to prevent fuel from draining or siphoning out of the tank. Place a suitable receptacle under the primary filter to collect any spilled fuel. Then, lay down some oil-absorbent pads to capture inevitable spills.

Next, unscrew the T-handle on top of the filter and remove the cap. If you have a Parker Racor filter, simply lift out the old filter element and place it into a plastic bag for disposal. If you have a different type or design, refer to the manufacturer's instructions.

After removing the top cover and T-handle, open the petcock on the bottom of the filter to remove any water and dirt in the bowl into a suitable receptacle. This will allow you to inspect the fuel for trash or water. Sometimes, the bowl on the actual filter body will not be very clear, so it is important to drain the sediment. Once done, retighten the petcock. If the fuel is particularly dirty, simply draining the fuel may not be enough, and the bowl will need to be cleaned more thoroughly.

Now, remove and dispose of the rubber O-ring from the base of the threads on the T-handle. Use a thin-blade screwdriver to unseat and remove the rubber gasket from the groove on the underside of the lid. Be careful not to damage the seat when prying out the gasket. With the seals removed, clean the mating surfaces and seal groove with a clean, lint-free rag.

Finally, remove the bottom bowl. This type of filter may have a bowl that separates from beneath the filter element, and there may be a lot of spilled fuel, so be prepared.

Oiling the O-rings

• Before installing a new O-ring, clean the sealing surfaces thoroughly using paper towels or lint-free cloth. This step helps remove any dirt or debris that could compromise the seal.
• Lubricate the O-ring with a small amount of oil. You can use diesel oil, engine oil, or even dip your finger in the fuel housing and rub it on the O-ring. Other suitable lubricants include engine oil, vaseline, ATF, grease, or diesel fuel.
• The primary purpose of oiling the O-ring is to facilitate installation. It allows the O-ring to slide smoothly as you tighten the filter canister lid, preventing it from bunching up, stretching, pinching, or tearing.
• Any lubricant suitable for contact with oil or fuel can be used. Avoid using penetrating fluids like WD-40 as they may soften the O-ring material.
• It is essential to replace the O-rings regularly and carry spares. They play a critical role in maintaining a proper seal and preventing fuel leaks.
• When installing the new O-ring, ensure it is not twisted or damaged. This can compromise the seal and lead to fuel leaks.
• If your Racor filter has multiple O-rings, oil and inspect each one carefully during replacement.
• Some people prefer to use white lithium grease or vaseline for lubrication. These substances provide a long-lasting lubricant and can be easily applied.
• While oiling the O-ring is essential, over-oiling can lead to excess oil dripping into the engine, which may cause smoke or other issues. Use just enough lubricant to facilitate installation and create a proper seal.

Filling the filter with fresh fuel

Before placing the new filter into the housing, ensure you have cleaned the mating surfaces and seal groove with a clean, lint-free rag. This will remove any dirt or debris that could contaminate the new fuel.

Now, carefully lower the new filter into the housing. It is important to handle the filter with clean hands or gloves to avoid introducing contaminants into the fuel. Once the filter is in place, begin filling the housing with fresh, clean fuel. Use a funnel if necessary to avoid spills.

The filter should be filled to the recommended level, which will be indicated on the housing or in the manufacturer's instructions. Do not overfill the filter, as this may cause spillage when the cap is replaced.

After filling the filter, the next step is to prepare the gasket and O-rings. Smear a small amount of clean fuel onto the surfaces of the new gasket and O-rings. This will help create a tight seal and prevent leaks.

Carefully reseat the gasket and O-rings into their respective grooves. Ensure they are correctly seated and not twisted or misaligned.

With the filter filled and the seals in place, you can now replace the cap. Make sure the filter housing is correctly seated in its groove and hand-tighten the cap, being careful not to overtighten.

By following these steps, you will have successfully filled the new primary Racor fuel filter with fresh fuel, ensuring optimal performance and reducing the risk of engine problems caused by contaminated fuel.

Reseating the O-rings and gaskets

Before reseating the O-rings and gaskets, it is important to clean the mating surfaces and seal groove with a clean, lint-free rag. This ensures that any dirt or debris left during the removal process is eliminated, providing a smooth surface for the new seals.

Now, let's begin the process of reseating:

• Smear Clean Fuel: Take a small amount of clean fuel and apply it to the new gasket and O-rings. This step helps the seals slide into their respective grooves more easily and creates a better seal.
• Reseat the Gasket: Carefully place the new gasket into its groove on the underside of the lid. Make sure it is correctly seated and aligned.
• Reseat the O-rings: O-rings are typically placed in grooves on the base of the threads of the T-handle. Gently push each O-ring into its respective groove, ensuring they are securely seated.
• Reinstall the T-handle: With the new gasket and O-rings in place, screw the T-handle back onto the filter housing. Tighten it with your hand until it is snug and secure.

By following these steps, you will have successfully reseated the O-rings and gaskets during the process of changing your primary Racor fuel filter. Remember to always refer to the manufacturer's instructions for your specific filter model, as there may be slight variations in the process.

Frequently asked questions