Rajan Wilcox
If you want to change the fuel filter on an Onan Quiet 7500 diesel generator, you're in luck: it's one of the easier things to do on the Onan RV generator. The fuel filter is easily accessible from underneath the RV. First, remove the fuel line from the fuel filter. Then, slowly turn the old filter counterclockwise to unscrew it from the fuel pump. You can watch a video showing every step of the process.
| Characteristics | Values |
|---|---|
| Fuel filter replacement | Easily accessible from underneath the RV |
| Fuel line | Needs to be plugged or pinched off to prevent fuel leakage |
| Fuel filter removal | Use a deep well 9/16" socket to turn the fuel filter counterclockwise |
| Connection nuts | Brass |
| Wrench size | 7/16 open-ended wrench |
| Wrench type | Crescent wrench not recommended; flare wrench may not fit due to metal sleeve and crimps |
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What You'll Learn
Removing the fuel line from the fuel filter
To remove the fuel line from the fuel filter, you will need to plug or pinch the fuel line to prevent fuel from leaking. You can then remove the rubber grommet from the oval hole to reveal the fuel filter. Using a deep well 9/16" socket, slowly turn the old filter counterclockwise to unscrew it from the fuel pump.
It is important to use the correct size wrench when removing the fuel filter. Using a Crescent wrench is not recommended as it can damage the brass fittings. If the connection nuts are difficult to loosen, you may try using a product like PB Blaster.
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Plugging or pinching the fuel line to prevent leaks
It is important to use the correct size wrench when replacing the fuel filter. Using a Crescent wrench is not recommended, as it can damage the brass fittings. Instead, a deep well 9/16" socket can be used to fit perfectly on the end of the fuel filter.
In addition to replacing the fuel filter, regular maintenance of the Onan 7500 generator is important. This includes changing the oil and filters, as well as performing coolant changes. By taking good care of the generator, it will provide reliable performance.
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Removing the rubber grommet from the oval hole
To remove the rubber grommet from the oval hole, you will need a deep well 9/16" socket. This will fit perfectly on the end of the fuel filter. Then, slowly turn the socket counterclockwise to unscrew the old filter from the fuel pump.
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Using a 9/16 socket to unscrew the old filter
To unscrew the old filter using a 9/16 socket, first remove the fuel line from the fuel filter. The fuel line needs to be plugged or pinched off, as gravity will cause the fuel line to leak gasoline. A rubber grommet can be removed from the oval hole, revealing the fuel filter. Slowly turn the 9/16 socket counterclockwise to unscrew the old filter from the fuel pump.
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Using the correct size wrench
To replace the fuel filter on an Onan 7500, you will need to use a wrench. The exact size of the wrench will depend on the make and model of your generator, but it is important to use the correct size to avoid damaging the brass fittings.
In the case of the Onan Quiet 7500 generator, a 7/16 open-ended wrench is too large and will not fit the nut. A deep well 9/16" socket is the correct size for this model and can be used to slowly turn the old filter counterclockwise and unscrew it from the fuel pump.
It is important to note that using a Crescent wrench is not recommended for this task. If you are unsure about the size of the wrench you need, it is best to consult a professional or refer to the generator's manual for guidance.
When using the correct size wrench, be sure to apply even pressure and turn the wrench in a counterclockwise direction to loosen the fuel filter. You may need to use a little force, but be careful not to overtighten the wrench as this can damage the threads on the fuel filter.
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Frequently asked questions
The fuel filter is easily accessible from underneath the RV. First, remove the fuel line from the fuel filter. The fuel line needs to be plugged or pinched off as gravity will allow the fuel line to leak gasoline. A rubber grommet is easily removed from the oval hole which then reveals the fuel filter. Then slowly turn the old filter counterclockwise and it will simply unscrew from the fuel pump.
You will need a 9/16" deep well socket and a wrench.
You will need a 7/16 open-ended wrench.
