2003- dropping fuel tank, what are these connectors?

2003- dropping fuel tank, what are these connectors?

Postby stellarG [OP] » April 21st 2018, 6:57pm

I'm dropping the fuel tank to do my fuel pump, and can't figure out how to undo various things around the tank. I want to take the tank all the way out. I'm working without a manual and many of the good writeups seem to be for an earlier model.

I'll post photos next time I get under the van, don't have them today.

There's a plastic assembly (that I assume is emissions-related?) sitting on top of the tank, towards the front of the tank. There are fuel lines (?) going to it. I can't figure out how to disconnect the lines. I can see two little jaws that grip a ring but I can't figure out how to release them.

There is also a wiring harness above the assembly, black and pretty big, with a red retaining strap that looks a little like a very thin ziptie and a couple of white retaining clips on either side of the harness connection. I have seen that before but have mostly worked on older vehicles and I can't figure out how to release any part of that.

NOte that I'm not talking about the fuel pump connections, but the other assembly on top of the fuel tank, towards the front of the tank.

Thank you!
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stellarG
Fueling (Empty tank)
Fueling (Empty tank)
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Re: 2003- dropping fuel tank, what are these connectors?

Postby WinnieVan » April 21st 2018, 7:38pm

That is the EVAP canister. You're doing the right thing -- you can pinch the outer ring and it should help release those little "jaws that grip a ring". It's a bit of a PITA -- but eventually they'll come off. I use some vice-grips to squeeze the outer ring and then a pick to push the jaws over that ring.

That wiring harness is called the fuel pump jumper. The pump side of that harness goes to the top of the fuel pump, where there are two additional pigtails (the ones that plug into the pump). You need to disconnect it before you drop the tank. I don't remember exactly how to re-lease that harness... but essentially you need to remove that red retaining strap, pry up on the lock tab and then you can pull them apart. I also remember it being a bit of a PITA the first time -- but keep at it -- you'll figure it out.
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Re: 2003- dropping fuel tank, what are these connectors?

Postby stellarG [OP] » April 22nd 2018, 1:11am

Thank you very much for the help! In case someone else needs this info, here are my photos:

evap canister connections :
https://photos.app.goo.gl/tdzvGy2GUgPqiSUu1

electrical connector above gas tank:

https://photos.app.goo.gl/3oc0eAkrrL9AVxhl2
Original Poster [OP]
stellarG
Fueling (Empty tank)
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Re: 2003- dropping fuel tank, what are these connectors?

Postby stellarG [OP] » April 22nd 2018, 1:13am

offtopic, but is there a way to insert images using Google Photos , or what is the best way to post photos these days? I haven't used a phpbb forum in years.
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Fueling (Empty tank)
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Re: 2003- dropping fuel tank, what are these connectors?

Postby AstroWill » April 22nd 2018, 1:23am


Trolls take away from productive work, best to ignore & go about your business.
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Re: 2003- dropping fuel tank, what are these connectors?

Postby WinnieVan » April 22nd 2018, 1:34pm

PS. It’s easier to remove the other side of the large evap canister hose. It’s attached to a small rectangular thing held into place by one bolt attached to the unibody.


I don’t remember removing the small evap hose... but perhaps I did... just go slow while dropping the tank and you’ll figure it out.

I used the threads on here to guide my repair and they helped a ton. It was the very first large vehicle repair I ever did... so if I can do it, you can do it too.
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Re: 2003- dropping fuel tank, what are these connectors?

Postby AstroWill » April 22nd 2018, 5:25pm

Another great resource is the GM Techline eSI(digital factory service manual), see the link in my sig.

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Re: 2003- dropping fuel tank, what are these connectors?

Postby stellarG [OP] » April 22nd 2018, 6:55pm

oh wow, your links are amazing. Thank you for putting that site together, so much good info.
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Re: 2003- dropping fuel tank, what are these connectors?

Postby 1lowcab » April 22nd 2018, 7:49pm

Oh, make you one of these...makes dropping the take a one man, one handed job!

Image
Image
Image
Image
Image

Bada bing bada boom, DONE!
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Re: 2003- dropping fuel tank, what are these connectors?

Postby AstroWill » April 22nd 2018, 8:00pm

stellarG wrote:oh wow, your links are amazing. Thank you for putting that site together, so much good info.

Thanks, all just started out because I ran out of room to put my links ;) Then I got tired of stating the same things again and again :rofl:

If you see anything that needs to be updated or added, feel free to send me a message.

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