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Fuel Filler Neck

nimmer

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nimmer Enthusiast

nimmer

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My 01 Sierra 1500 has been showing the Check Engine Light sporadically, so I took the truck to the local Mechanic and he checked the codes and showed that there was a 'leak' in the system. So the mechanic did a smoke test and found a 'leak' in the Fuel Filler Neck up close to the top of the neck. So he tried to do a patch, and that seemed to work for about a week and the Check Engine Light came back on. So now it seems that I've got to replace the Neck. Have any of you guys had the same issues? Is the replacement job something the backyard mechanic can do or should I have my mechanic do the job?

zedbear Enthusiast

zedbear

Posted
Posted

I had my tank out recently to replace the fuel pump. The metal part at the top of the neck is rusted to hell but not leaking yet. I looked around for another one but I couldn't find one in a local yard that wasn't rusted to hell as well. Online GM parts dealers sell them for around 185-200. Aftermarket support for this part seems sparse but I did look at LMC truck's website and one is listed for 99 bucks.

 

As for doing the job, I think as long as you have long arms and patience, you can do it. Removing the left rear wheel might make access a little easier. There's 3 tiny bolts that hold the neck to the fuel filler "pocket" at the top and a big hose clamp at the tank. There is also a ground strap riverted to the top of the neck and bolted to the truck frame at the bottom. Mine broke of course so I had to run a new ground. I sprayed a small amount of WD-40 to make sliding the hose back onto the tank easier.

nimmer Enthusiast

nimmer

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Zedbear, so it sounds like you bought the neck from LMC and did the install yourself. Were you satisfied with the LMC neck? Did you need any 'special' tools? How much effort was it to install only the neck? I've got to get it replaced before my next Emissions test and now that it's warmer here in CT, I'm thinking of doing it myself. What should I be aware of or expect. Thanks

zedbear Enthusiast

zedbear

Posted
Posted

Zedbear, so it sounds like you bought the neck from LMC and did the install yourself. Were you satisfied with the LMC neck? Did you need any 'special' tools? How much effort was it to install only the neck? I've got to get it replaced before my next Emissions test and now that it's warmer here in CT, I'm thinking of doing it myself. What should I be aware of or expect. Thanks

 

 

I actually didn't replace it. I cleaned up the loose rust the best I could and sprayed it with that rust stopper stuff and put it back on. I had it off to make putting the fuel tank back in easier, after replacing the fuel pump. I noticed the filler neck from LMC was available after I had put it all back together of course, lol.

 

Just make sure you soak the 3 little bolts that hold the top of the neck with PB blaster or similar for a day or two. You can lay under the truck and reach up to the back side of the bolts and spray them. There are also two Torx bolts at the top of the fuel filler opening that hold on the plastic shroud. Soak those from the back as well.

 

Unscrew the 3 small bolts, then the two torx bolts. Pull the plastic shroud out (may have to sorta wiggle/force it out). I don't think you HAVE to remove the plastic shroud as you could probably maneuver the neck out from under the truck......but I wouldn't. This way you can pull the whole thing straight up and out through the fuel filler opening.

 

Remove the ground strap bolt from the frame (soak that ahead of time as well. Mine still broke but its worth a try), then loosen the hose clamp where the neck attaches to the tank.

 

This is where you might run into issues. Even with the tank out of the truck, it was a biotch to get the hose off the tank (its like a giant radiator hose). Inside of this hose is a smaller plastic tube that extends into the fuel tank aways. It should just pull out with the whole assembly. Just be aware you will have to maneuver that tube into the tank when you install the new assembly. I wish I had taken pictures to show but I was too aggravated when I was doing the job, lol.

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