Thursday, October 6, 2011

How do you change the fuel filter on a 2003 Chevy Trailblazer?

Also, where is the fuel filter located?
How do you change the fuel filter on a 2003 Chevy Trailblazer?
I own a shop, and this is how we do it. Just to be safe, and not burn down the shop, we remove the fuel pump fuse, or relay to keep it from coming on, and pumping the fuel while we work on it. Yes... the pump can come on with the ignition switch off, so do it safe, rather than sorry. We jack the front of the vehicle up by running up on some ramps, and this will keep the amount of fuel that comes out to a minimum. Use a container to catch the fuel in. The filter is located about mid-way between the wheels on the drivers side. You need a 10mm socket and/or a wrench to remove the bolt from the clamp that holds the filter in place. The bolt comes out from the top of the frame rail. You will need 5/8%26quot; line wrench, a 7/8'' open end wrench, a 3/4'' open end wrench to remove the lines. Remove the front line first, by holding the filter with one wrench, and turning the line nut with the 5/8'' line wrench. When you move the line forward out of the filter, you will get about a glass full of fuel come out. Be careful to not damage the O-ring that is on the line, as you will have to use it again. You might go by a dealership, and pick up some new ones, as this is the only place to get them. Now, remove the rear line by pulling the filter forward away from the line. This will also cause some gas to pour out, so be prepared to catch it. A good idea is to roll your sleeves up past your elbows when you do this job, and have several shop towles handy, because there is no way around some fuel pouring out. Drop the old filter in the bucket, and don't mess around getting the new one in place. If the fuel tank has much gas in it, it will push it out the line, so its a good idea to do this with a minimum of fuel in the tank. The O-rings that go on the lines are bad to break, and care must be taken to get the filter in place, and the lines back on. Tighten the lines good, replace the screw that holds it to the frame, replace the fuse, and turn the ignition switch on for 3 seconds, and off for three seconds. Do this several times to build the pressure back on the line. Now, inspect the filter for any leaks before you attempt to start the engine. When installing the new filter, look for an arrow on the filter that indicates the direction of flow, and you want the arrow pointing toward the front of the vehicle. Once you have determined there is no leaks, start the engine, and let it run for about 10 seconds, and shut if off again. Inspect the line for leaks by running you fingers around the fittings, and looking for any wet on your fingers. If its ok, then you are set to go.

Glad to help you, Good Luck!!!
How do you change the fuel filter on a 2003 Chevy Trailblazer?
Ok all these people or correct, but I just heard recently that for some unknown reason. They put some in the tank go figure. Should be on the drivers side though in the frame rail. 17 mm and a 20 mm needed to change it. I change mine every other oil change.
It's under the vehicle between the engine and the fuel tank. It either has a clip type fuel line or a clamp type fuel line and it will be more than likely clamped to the frame.
I just changed mine on a 2003, the fuel filter is on the drivers side between the front seat and back seat underneath the vehicle and there is a clamp holding the whole unit in place, take it out off the clamp and on one end you need 2 wrenches to loosen the fitting and on the other end you have a slip on connection that you have to squeeze 2 prongs together and pull it off. Just reverse everything to put it back on. Good Luck.

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