Rajan Wilcox
When changing the fuel filter on a Blazer, you will need two wrenches: one that fits the filter and one for the fuel line fitting. The fuel filter on a 1999 Blazer uses a 21mm wrench. The wrench for the line fittings is 5/8, and you need to use a line wrench or a good-quality open-end wrench. For the filter, it is either a 13/16 or a 7/8 wrench.
Characteristics and Values Table for Wrench Size to Change Fuel Filter on a Blazer
| Characteristics | Values |
|---|---|
| Wrench size for the fuel filter | 21mm |
| Wrench size for the smaller nut | 16mm |
| Wrench size for the line fittings | 5/8" |
| Other possible wrench sizes for the filter | 13/16 or 7/8 |
| Type of wrench for the line fittings | Line wrench |
| Type of wrench for the filter | Open-end wrench |
Explore related products
What You'll Learn
A 21mm wrench is needed for the fuel filter
When changing the fuel filter on a Blazer, you will need a 21mm wrench to secure the larger nut on the inlet side of the filter. This is the same for 1997, 1999, and 2001 models.
To change the fuel filter, first, park the truck on a flat, level surface and set the parking brake. Then, crawl under the truck and locate the fuel lines coming out of the fuel tank. Trace these lines to the fuel filter, which is found along the frame rail by the driver-side door. Next, pull the quick-disconnect fitting off the outlet side with your hands. The quick-disconnect is equipped with a locking tab that can be pulled up, allowing the fitting to slide off the filter piping.
Now, you will need your 21mm wrench to hold the larger nut on the inlet side of the filter. You will also need a 16mm wrench to tighten the smaller nut. With the new filter positioned next to the plastic mounting bracket, push the outlet and inlet lines onto the filter. The quick-disconnect will lock when pushed far enough. Thread the smaller nut by hand and secure it with the wrenches.
Finally, start the truck and let it idle for five minutes. Check for any leaks around the filter.
Fuel Filter Efficiency: Is 100 Microns Fine?
You may want to see also
Explore related products
A 16mm wrench is used to tighten the smaller nut
When changing the fuel filter on a 1999 Blazer, you will need a 21mm wrench to secure the larger nut and a 16mm wrench to tighten the smaller nut. It is important to relieve the pressure in the fuel line before attempting to change the fuel filter. This can be done by pulling the fuse and allowing the truck to run until it stalls, or by letting the truck sit for a few hours.
The fuel filter is located along the driver-side frame rail. To change the fuel filter, first, pull the quick-disconnect fitting off the outlet side with your hands. Then, hold the larger nut on the inlet side with the 21mm wrench and tighten the smaller nut with the 16mm wrench.
It is recommended to use a good-quality line wrench or a Sears Craftsman line wrench to tighten the nuts. An open-end wrench usually works fine, but sometimes a line wrench is needed. You may also need additional tools, such as a basic socket set for the little bolt that holds the bracket to the frame.
It is important to exercise caution when working with gasoline, as it is highly toxic and flammable.
The Cat Fuel Filter: Superior Performance and Efficiency
You may want to see also
Explore related products
A 5/8 wrench can be used on the fuel line nut
When changing the fuel filter on a Blazer, it is important to use the correct tools to ensure the job is done safely and efficiently. One of the steps in this process involves using a wrench on the fuel line nut.
It is worth noting that some sources suggest using a line wrench for this task to avoid rounding off the nut. A Sears Craftsman line wrench, or a similar good quality alternative, is recommended. Using a basic open-end wrench on the fuel line nut may work, but a line wrench is often necessary.
In addition to the 5/8 wrench for the fuel line nut, you will also need a wrench for the filter itself. For a 1999 Blazer, a 21 mm wrench is used to secure the larger nut on the inlet side of the filter. A smaller nut on the inlet side is tightened with a 16 mm wrench.
It is always important to refer to the specific make and model of your Blazer when determining the correct tools and sizes, as there may be variations between different models.
Fuel Filter Lifespan: How Long Can You Drive?
You may want to see also
Explore related products
A 17mm flare nut wrench may also be used
When changing the fuel filter on a 1999 Blazer, a 21 mm wrench is required to secure the larger nut on the inlet side of the filter. A 16 mm wrench is then used to tighten the smaller nut on the same side.
It is important to note that the fuel filter is mounted along the driver-side frame rail. To change the fuel filter, you will need to crawl under the truck and locate the fuel lines coming out of the fuel tank. Trace these lines to the fuel filter and pull the quick-disconnect fitting off the outlet side.
Some people have reported using a 17mm flare nut wrench for this task, but it may be a tad loose. It is always important to use the correct size wrench to avoid damage and injury. In this case, a 21mm wrench is the correct size for the fuel filter on a Blazer.
When working with fuel filters, it is important to use caution as gasoline is highly toxic and flammable. It is also recommended to have a basic socket set for the little bolt that holds the bracket to the frame.
The MEP Generator Fuel Filter: Maintenance Must-Know
You may want to see also
Explore related products
Two wrenches are required to remove the fuel filter
It is important to use the correct size wrench for each nut. Using a wrench that is too small can damage the nut and make it difficult to remove. Additionally, using a low-quality wrench can also cause damage. It is recommended to use a good quality line wrench, such as a Sears Craftsman line wrench.
The process of removing the fuel filter on a Blazer is relatively straightforward. The fuel filter is located along the driver-side frame rail. To remove it, one wrench is placed on the fitting on the line, and the other wrench is placed on the filter. The filter can then be popped loose.
It is important to note that there may be a bar under the fuel filter that can make it difficult to access the nuts with the wrench. In this case, it is important to position yourself far enough under the car to have the leverage to squeeze the wrench in place.
Poulan Wild Thing Chainsaw: Where's the Fuel Filter?
You may want to see also
Frequently asked questions
You will need a 21mm wrench to hold the larger nut on the inlet side of the filter. You will also need a 16mm wrench to tighten the smaller nut on the same filter.
You will need a 21mm wrench for the fuel filter.
You will need two open-end wrenches to change the fuel filter.
The filter requires either a 13/16 or a 7/8 wrench.
