Katerina Swanson
If you're experiencing issues with your Isuzu NPR and need to reset the fuel filter light, there are a few steps you can take. Firstly, it's important to determine whether the issue is with the water separator or the service reminder light, as they are two separate things. Next, locate the fuel-water-separator, which is usually behind the driver's side door, and place a drain container beneath it. Loosen the drain valve to release any water, then tighten it once complete. After this, locate the fuel filter and place rags beneath it to collect any fuel that leaks out. Remove the fuel filter by rotating it counterclockwise, and ensure that the gasket was removed with the filter canister. Clean the mounting flange with a lint-free cloth, and fill the replacement fuel filter with clean diesel fuel or a diesel fuel additive. Lubricate the gasket, install the new fuel filter, and locate the bleed orifice to loosen it. Finally, fill the fuel-water-separator with clean diesel fuel, and the light should go out on its own.
| Characteristics | Values |
|---|---|
| Fuel filter reset process | Unplug the sender, pull the fuse in the fuse panel, or disconnect the battery for 10 minutes |
| Fuel filter replacement process | Locate the fuel-water-separator, place a drain container beneath it, loosen and drain it, tighten the petcock, locate the fuel filter, place rags beneath it, remove the fuel filter, verify the fuel filter gasket was removed, clean the fuel filter mounting flange, fill the replacement fuel filter with clean diesel fuel or a diesel fuel additive, lubricate the fuel filter gasket, install the new fuel filter, locate the fuel filter bleed orifice, loosen it, place a shop towel over it, fill the fuel-water-separator with clean diesel fuel or a diesel fuel additive |
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What You'll Learn
- The FUEL FILTER -109 light indicates the need to replace the fuel filter
- Resetting the light requires draining the fuel-water-separator
- Locate the fuel-water-separator behind the driver's side door
- Place a drain container, loosen the petcock, and drain
- Tighten the petcock, locate the fuel filter, and place rags beneath it
The FUEL FILTER -109 light indicates the need to replace the fuel filter
The FUEL FILTER -109 light on your Isuzu NPR indicates that the fuel filter needs to be replaced. This light comes on when the fuel filter is clogged and needs to be replaced.
A clogged fuel filter can cause a range of issues, including reduced power, especially during acceleration, and can result in sluggish performance or difficulty reaching higher speeds. In some cases, a clogged fuel filter may cause the engine to hesitate, surge, sputter, or stall. It can also lead to engine misfire, poor fuel mileage, rough idling, and even damage to the fuel pump or fuel injectors.
To reset the FUEL FILTER -109 light, you will need to replace the fuel filter. Here is a step-by-step guide on how to do this:
- Locate the fuel-water-separator. On the Isuzu NPR, it is usually located just behind the driver's side door, mounted on the outer frame rail.
- Place a suitable drain container beneath the fuel-water-separator drain valve.
- Loosen the petcock (drain valve) to allow the fluid to drain completely, then tighten it again.
- Locate the fuel filter, which is usually mounted on top of and towards the rear of the engine.
- Place several rags beneath the fuel filter canister to collect any fuel that leaks out when the filter is loosened.
- Remove the fuel filter by rotating it counterclockwise, looking from the bottom of the filter into the threads on the mount.
- Clean the fuel filter mounting flange with a clean, lint-free cloth or shop rag.
- Fill the replacement fuel filter with clean diesel fuel or a diesel fuel additive. Do not use diesel fuel from the old fuel filter.
- Lubricate the fuel filter gasket using clean diesel fuel or clean engine oil.
- Install the new fuel filter by hand-tightening it in reverse order. Do not use tools as overtightening may compromise the gasket seal.
- Locate the fuel filter bleed orifice at the top of the filter mount and loosen it.
- Place a shop towel or rag over the bleed orifice to catch any seeping fuel.
- Optionally, fill the fuel-water-separator with clean diesel fuel or diesel fuel additive.
By following these steps, you can replace the fuel filter on your Isuzu NPR and reset the FUEL FILTER -109 light.
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Resetting the light requires draining the fuel-water-separator
Resetting the fuel filter light on an Isuzu NPR requires draining the fuel-water-separator. This process involves several steps to ensure the effective removal of water from the separator and the proper functioning of the fuel system.
Firstly, locate the fuel-water-separator, which is typically positioned just behind the driver's side door, mounted on the outer frame rail. Place a suitable drain container beneath the fuel-water-separator drain valve, which is also known as the petcock. Loosen the petcock to allow the water to drain completely from the separator. Once the water has drained, tighten the petcock securely.
The next step is to locate the fuel filter, which is usually mounted on top of and towards the rear of the engine. Place several rags or shop towels beneath the fuel filter canister to catch any fuel that may leak when the filter is loosened. Remove the fuel filter by rotating it counterclockwise when viewed from the bottom of the filter, or clockwise when viewed from the top of the mount. Ensure that the fuel filter gasket is removed along with the filter canister.
Before installing a new fuel filter, clean the fuel filter mounting flange with a lint-free cloth or shop rag. Fill the replacement fuel filter with clean diesel fuel or, if unavailable, a diesel fuel additive. Do not use diesel fuel from the old fuel filter. Lubricate the fuel filter gasket with clean diesel fuel or, preferably, clean engine oil. Install the new fuel filter by following the previous steps in reverse order, tightening it snugly by hand without using tools to avoid compromising the gasket seal.
Locate the fuel filter bleed orifice at the top of the filter mount and loosen it with a wrench or socket. As fuel will seep out during this process, cover the bleed orifice with a shop towel or rag. Optionally, fill the fuel-water-separator with clean diesel fuel or a diesel fuel additive to aid the engine in gaining and maintaining its fuel system prime.
Finally, start the engine and let it run for several minutes. It is normal for the engine to run rough or stall during this initial period until full fuel prime is achieved. Check for any fuel leaks at the fuel filter and fuel-water-separator.
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Locate the fuel-water-separator behind the driver's side door
To reset the fuel filter light on an Isuzu NPR, you will first need to locate the fuel-water-separator. On this Isuzu model, the fuel-water-separator is located just behind the driver's side door, mounted on the outer frame rail.
Locate the Fuel-Water-Separator
Firstly, you need to find the fuel-water-separator. This is located just behind the driver's side door. Open the door and look directly behind it, and you should see the fuel-water-separator mounted on the outer frame rail.
Place a Drain Container
Once you have located the fuel-water-separator, place a suitable drain container beneath the drain valve. This will collect any fluid that comes out of the separator. Ensure the container is secure and will not tip over.
Loosen the Drain Valve
Now, loosen the petcock (drain valve) on the fuel-water-separator. This will allow any fluid to drain out. Ensure the drain container is in the correct position to catch the fluid.
Tighten the Drain Valve
After the fuel-water-separator has drained completely, tighten the fuel-water-separator petcock. Ensure it is securely tightened to prevent any leaks.
Optional: Refill the Fuel-Water-Separator
If you need to refill the fuel-water-separator, use clean diesel fuel or a diesel fuel additive. Do not use old diesel fuel.
After completing these steps, you can move on to the next stage of resetting the fuel filter light, which involves working on the fuel filter itself.
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Place a drain container, loosen the petcock, and drain
To reset the fuel filter light on an Isuzu NPR, you will need to drain the fuel-water-separator. This process involves several steps to ensure a safe and effective procedure.
Firstly, locate the fuel-water-separator, which is usually positioned just behind the driver's side door, mounted on the outer frame rail. Once you have located it, place a suitable drain container beneath the fuel-water-separator drain valve. This step is crucial to catch any drained fluid and prevent spillage.
The next step is to loosen the petcock, or drain valve, on the fuel-water-separator. Loosen it carefully and allow the fluid to drain completely into the container. It is important to ensure that the fluid has finished draining before proceeding to the next step. Once the draining is complete, tighten the fuel-water-separator petcock securely.
These initial steps of placing a drain container, loosening the petcock, and draining the fluid are essential for effective maintenance of your Isuzu NPR's fuel system. Following these steps will help ensure a safe and controlled process, preventing any spillage or wastage of fluids.
After completing these steps, you can proceed with further maintenance or reset procedures, depending on your specific requirements. Remember always to refer to your vehicle's manual for additional instructions or safety precautions that may be unique to your model.
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Tighten the petcock, locate the fuel filter, and place rags beneath it
To reset the fuel filter light on an Isuzu NPR, you must first drain the fuel-water separator and replace the fuel filter. This should be done every 13,000 miles, 12 months, or anytime there is water in the separator bowl.
Now, to tighten the petcock, locate the fuel-water separator, and place rags beneath the fuel filter, follow these steps:
Tighten the Petcock
- Locate the fuel-water separator. On the Isuzu NQR, it is located just behind the driver's side door, mounted on the outer frame rail.
- Place a suitable drain container beneath the fuel-water separator drain valve.
- Loosen the petcock (drain valve) and allow it to drain completely.
- Tighten the petcock after it has drained.
Locate the Fuel Filter and Place Rags Beneath It
- Locate the fuel filter. It is mounted on top of and towards the rear of the engine.
- Place several rags beneath the fuel filter canister to collect any fuel that leaks out when the filter is loosened.
- Remove the fuel filter by rotating it counterclockwise when looking at the bottom of the filter into the threads on the mount.
- Verify that the fuel filter gasket was removed with the filter canister and is not stuck to the flange of the mount.
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Frequently asked questions
Try unplugging the sender, pulling the fuse in the fuse panel, or disconnecting the battery for 10 minutes.
You should have two fuel filters. One is a fuel water separator (Cartridge) and one is a spin-on. Drain the water from the separator and pre-fill the filters with fresh fuel. The light will go out on its own.
You will need to replace the fuel filter. First, locate the fuel-water-separator and place a suitable drain container beneath it. Loosen the petcock to allow it to drain completely, then tighten it again. Next, locate the fuel filter, place rags beneath it, and remove it by rotating counterclockwise. Verify that the fuel filter gasket was removed, then clean the fuel filter mounting flange. Fill the replacement fuel filter with clean diesel fuel or a diesel fuel additive, lubricate the fuel filter gasket, and install the new fuel filter.
This is a reminder light indicating that the fuel filter is -109 miles past service.
