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If you own a 1999 Oldsmobile Cutlass, you may need to replace the fuel filter at some point. This is a basic maintenance task that can be carried out by following a step-by-step process. In this article, we will cover the tools you will need, the location of the fuel filter, and the steps to replace it.
| Characteristics | Values |
|---|---|
| Location of fuel filter | Along the right frame rail ahead of the rear wheel |
| Tool to loosen nut on steel line | Line wrenches (flare nut wrenches) |
| Nut material | Soft metal |
| Water | Must be drained |
| Clogged fuel filter | Must be removed with the fuel pump from the fuel tank |
| Fuel filter leak | Must be repaired before driving the car |
| Clogging causing engine operating problems | Must be investigated and resolved |
| Plugged fuel filter | Can be ruled out using pressure and volume tests on the fuel system |
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What You'll Learn
De-pressurising the fuel system
To de-pressurise the fuel system of a 1999 Oldsmobile Cutlass, you can use a pressure gauge to aim the bleed-off hose into a container and hit the pressure bleed-off button. The pressure gauge fits to the Schrader valve. If you can easily disconnect the pump, you can start the vehicle and let it run until it dies. Usually, after the vehicle has sat overnight without the key being cycled or the engine running, there isn't much pressure left in the system. However, you should still be aware that some pressure may remain.
If you suspect that your fuel filter is clogged, you can perform pressure and volume tests on the fuel system to rule out a plugged fuel filter. If your fuel filter is leaking, you should have it repaired before driving the car.
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Disconnecting the pump
To disconnect the pump, start the vehicle and let it run until it dies. Usually, after the vehicle sits overnight without the key being cycled or the engine running, there isn't much pressure. However, you still need to be aware. You can also use a pressure gauge, aim the bleed-off hose into a container, and hit the pressure bleed-off button. The pressure gauge fits the Schrader valve.
The fuel filter sits along the right frame rail ahead of the rear wheel. Use a pair of line wrenches (flare nut wrenches) to loosen the nut on the steel line. That nut is very soft metal, and a regular open-end wrench will usually round it off.
If the fuel filter is clogged and integral to the fuel pump, it must be removed with the fuel pump from the fuel tank to perform service.
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Draining water from the fuel tank
To drain water from the fuel tank of a 1999 Oldsmobile Cutlass, you will need to replace the fuel filter.
First, you will need to depressurise the fuel system. You can do this by using a pressure gauge and aiming the bleed-off hose into a container. Hit the pressure bleed-off button. The pressure gauge fits to the Schrader valve. If you can easily disconnect the pump, you can start the vehicle and let it run until it dies.
Next, you will need to locate the fuel filter. It sits along the right frame rail ahead of the rear wheel. Use a pair of line wrenches (flare nut wrenches) to loosen the nut on the steel line. This nut is made of soft metal, so be careful not to round it off with a regular open-end wrench.
Once the fuel filter is removed, the water can be drained from the fuel tank. It is recommended to service or replace the filter if it is clogged. A clogged fuel filter that is integral to the fuel pump must be removed with the fuel pump from the fuel tank to perform service.
Be sure to investigate and resolve any engine operating problems caused by clogging. In extreme cases, a very old filter that is plugged could disintegrate, allowing trapped contaminants to reach the fuel injectors and causing additional problems.
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Removing the fuel filter
To remove the fuel filter from your 1999 Oldsmobile Cutlass, you will need to locate the filter, which sits along the right frame rail ahead of the rear wheel. Once you have found it, follow these steps:
- Disconnect the fuel lines from the filter.
- With the clips removed, slide the fuel lines away from the filter to pop them off of the nozzles on either end. Make sure to tip the fuel lines toward a bowl or bucket to catch any spilled gasoline.
- Loosen the screw clamp or bolts holding the fuel filter in position.
- Remove the filter and place it to one side.
It is important to wear eye protection and gloves during this process to protect yourself from fuel splatter, and to do your best to avoid allowing any gas to pour out onto the ground.
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Using line wrenches to loosen the nut on the steel line
To replace the fuel filter on a 1999 Oldsmobile Cutlass, you will need to depressurise the fuel system. This can be done by using a pressure gauge, aiming the bleed-off hose into a container, and hitting the pressure bleed-off button. The pressure gauge fits to the Schrader valve.
To loosen the nut on the steel line, use a pair of line wrenches (flare nut wrenches). The nut is made of very soft metal, so a regular open-end wrench will usually round it off.
It is important to note that if there is a leak, it should be repaired before driving the car. If clogging is suspected, the cause should be investigated and resolved as soon as possible. In extreme cases, a very old and plugged fuel filter can disintegrate, allowing trapped contaminants to reach the fuel injectors and cause additional problems.
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Frequently asked questions
If there is a leak, have it repaired before driving the car. If clogging is suspected and potentially causing engine operating problems, have the cause investigated and resolved as soon as possible. A plugged fuel filter can be ruled out using pressure and volume tests on the fuel system.
Use a pair of line wrenches (flare nut wrenches) to loosen the nut on the steel line. That nut is very soft metal and a regular open-end wrench will usually round it off.
Use a pressure gauge, aim the bleed-off hose into a container, and hit the pressure bleed-off button. The pressure gauge fits to the Schrader valve. If you have an easy way to disconnect the pump, then just start the vehicle, let it run until it dies.
