How-To Fuel Filter Replacement on 02-04 TV WITH PICS - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 04-14-2009, 11:22 PM
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How-To Fuel Filter Replacement on 02-04 TV WITH PICS

GM recomends the fuel filter be replaced every 30,000 miles.

NOTE: This procedure is for the 2002-2004 4.2L I6 motor without a tank shield and was done on a Trailblazer (Envoys should be the same. I know the 2004 Envoy has the same part number).

**The fuel filter is located directly in front of the gas tank on the drivers side.

Tools:

- Philips head screwdriver
- Needle Nose pliers (can be done without them but they make it easier. See pic)
- A pan to catch gasoline when removing the connectors (oil pan will do)
- A jack
- Safety glasses

Materials:

- A fuel filter (part # FF864 at Autozone)
- Shop rags


Step 1) Remove gas fill cap

Step 2) Remove the fuel pump relay in the under hood fuse box. Then start the engine and run it till it stalls. Continue to crank it for 5-10 seconds after.

Step 3) Disconnect the negative battery cable.

Step 4) Jack up the front drivers side of your trailvoy (if necessary)

Step 5) Locate the fuel filter directly in front of the fuel tank. Clean the area around the inlet and outlet fittings (better than I did) making note of the order of the two (the fuel filter is directional).

Step 6) Put the pan underneath the filter. Unscrew the cap off the bleeder valve and depress with the pliers or screwdriver to release any possible remaining pressure then screw the cap back on.

Step 7) Use the needle nose pliers (or your fingers) to squeeze the quick connect clips and pull off each of the hose fittings one at a time noting the location of the inlet and outlet tubes. The filter is directional. (some fuel will come out when disconnected).

Step 8) Unscrew the filter clamp and remove old filter. (the filter will have more fuel in it. Tilt it into the pan to spill the excess out)

Step 9) Screw in the new filter (inlet side towards the tank, outlet towards the engine), snap the fittings back on, lower your trailvoy, replace the relay and negative battery cable, screw on your gas cap.

Step 10) Start it up. (it may take a few cranks to get the fuel back up).
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  #2  
Old 04-14-2009, 11:45 PM
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Very nice write up, and nicely done on the pictures...this on my long list of to-do's lol
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Old 04-14-2009, 11:53 PM
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Quote:
Originally Posted by cowboy63645 View Post
Very nice write up, and nicely done on the pictures...this on my long list of to-do's lol
Thanks. Quick and Easy to-do. Took me longer to get this post together.
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Old 04-15-2009, 12:41 AM
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I just did this on mine yesterday... I did not disconnect the fuel pump relay though. Once you release the pressure with the valve, the same amount of fuel is going to come out of the filter/lines regardless of having the pump relay in and not letting the engine die... I think I spilled maybe 1-2 ounces of fuel...

My original filter had 75k on it... maybe that was part of the reasoning behind my craptastic mileage. Let's see how she does now... LOL

Awesome write up and great pics though... Submit the Write Up with pics for an Article...
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Old 04-15-2009, 12:51 AM
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Hmm, I may have a new project tomorrow morning
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  #6  
Old 04-15-2009, 12:58 AM
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I did this on my Trailblazer about 400 miles ago and have seen a jump in gas mileage of around 1 to 2 MPGs. This is definitely worth the time and small amount of money!
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Old 04-15-2009, 01:04 AM
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Quote:
Originally Posted by gordinho80 View Post
I just did this on mine yesterday... I did not disconnect the fuel pump relay though. Once you release the pressure with the valve, the same amount of fuel is going to come out of the filter/lines regardless of having the pump relay in and not letting the engine die... I think I spilled maybe 1-2 ounces of fuel...

My original filter had 75k on it... maybe that was part of the reasoning behind my craptastic mileage. Let's see how she does now... LOL

Awesome write up and great pics though... Submit the Write Up with pics for an Article...
Thanks. Just being over protective with the relay. 75K? I felt bad that I left it go for almost 5K over. Boy, was I being hard on myself

That was my 1st fuel filt change on this (the factory sticker on the old filter is a giveaway). My 2004 with less than 35000 miles on her. Haven't ran a full tank of fuel since the change so I can't say if it helps fuel economy but I did run a lucas fuel system cleaner in the tank before the change hoping to knock any barnacles loose in the system.

I am working on getting this over to the article section, thanks. I've gotten alot from this site. Just wanna give some back.
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Old 04-15-2009, 01:08 AM
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Quote:
Originally Posted by thevolblogger View Post
I did this on my Trailblazer about 400 miles ago and have seen a jump in gas mileage of around 1 to 2 MPGs. This is definitely worth the time and small amount of money!
Welcome to the forum.

1 to 2 MPG huh? Looks like i've got something to look foward to .

The total cost (filter) was less than $20
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Old 04-15-2009, 01:10 AM
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Good Job on the write up.


Really good idea pulling the fuel pump relay!! i just clamped both of the hoses that lead into it then pulled it off, but thats much better !!
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Old 04-15-2009, 01:16 AM
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Originally Posted by Africandude13 View Post
Good Job on the write up.


Really good idea pulling the fuel pump relay!! i just clamped both of the hoses that lead into it then pulled it off, but thats much better !!


I like your floorboard LED how-to. Future mod now.
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