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Like you guys I did what is suggested here. I removed and cleaned them, which lasted about a year. Then I replaced both sides. Everything is working great now but as we all know about parts no longer being available I may just buy 2 of the $50 senders from RockAuto and keep them in stock to assure myself never having this same problem reoccurring. Sorta like when I bought a snowblower, then never needed that either.
Depending on your location, you may need that blower this weekend!!!
The sender is easy to take apart and I cleaned the sender slipring contact with an eraser and verified resistance value prior to installing the sender back in the tank .
If the resistance value changes in a stable way when testing outside the tank it should provide proper voltages values to the PCM when installed in the tank covered by fuel .
The tension in moving slipringcontacts should be verified prior to reinstallation
The sender is easy to take apart and I cleaned the sender slipring contact with an eraser and verified resistance value prior to installing the sender back in the tank .If the resistance value changes in a stable way when testing outside the tank it should provide proper voltages values to the PCM when installed in the tank covered by fuel .The tension in moving slipringcontacts should be verified prior to reinstallation 
That is a really nice picture of the sender. Looks.like it is just solder flow. No wonder why it wears down and can migrate between the traces. You can see where it is starting to wear down.
It's most likely silver or nickel with silver solder. Copper and tin / lead solder would be too soft. At any rate, looking at these pictures and comparing to the pictures RockAuto has, it looks like the GM 19421094 part might be a different design b/c the outer band doesn't appear to be segmented like these user pics. I just ordered a pair, will report back when they show up. This might indicate GM did redesign these later on, and could be a permanent fix to this problem.
LOL @ sonicss33. It just got above 0F about an hour ago here. I stream WFKZ out of Plantation Key a lot, and the weather guy was dramatizing the "cooooold" low of 56F the other day. I just chuckled.
I just ordered a pair, will report back when they show up. This might indicate GM did redesign these later on, and could be a permanent fix to this problem.
I’m 23 miles from KW so I think I’m safe. May get into the 60’s though.
We had 29 in Hudson, Florida this A.M....Considering this IS Florida, to paraphrase my dearly departed father (RIP dad!!) this morning was "Colder than a farmers *** on a frosty morning!!"
Definitely a slightly different design, but I'm not feeling like this is a magic bullet. The outer band is still segmented. Material looks to be similar in composition to the other pics. The only difference is the shape of the resistor network that's encapsulated behind the black material.
Edit: Well fornicate me. Seems the forum software makes it impossible to embed the original image. Click the link below to see full resolution of above. I hate this forum (software).
Definitely a slightly different design, but I'm not feeling like this is a magic bullet. The outer band is still segmented. Material looks to be similar in composition to the other pics. The only difference is the shape of the resistor network that's encapsulated behind the black material.
Edit: Well **** me. Seems the forum software makes it impossible to embed the original image. Click the link below to see full resolution of above. I hate this forum (software).
See pic below. Mr. Black put these part #s up back in posts #14 and #16.
One thing I noticed after posting the previous image is that the contacting portion of the wipers on this part are less "robust" than the ones of the presumably older units further back in this thread.
If any moderator sees this would you please contact me via PM. I have a question about posting pictures so they're not using up your space or bandwidth, which was the cause of the profanity in post # 72.
Last edited by spfautsch; Dec 28, 2022 at 07:29 PM.
One thing I noticed after posting the previous image is that the contacting portion of the wipers on this part are less "robust" than the ones of the presumably older units further back in this thread.
Totally agree, this does not look nearly as robust as the original style.
...what kind of sealing apparatus is used here? If I pull these pieces out, what's the chance the sealing apparatus tears / breaks / otherwise disintegrates upon removal...
I totally understand your concern on this task, but not really an issue here. The Delphi unit I ordered from RA, came with a new thick rubber gasket that totally conforms to the tank and new cover. Torqued the six fasteners to 25 in/lbs (per GM Service Manual) and was good to go! No leaks.
Last edited by Brad-in-STL; Dec 29, 2022 at 10:33 PM.
I have finally accepted that I need to replace the senders on my 2003. I've got a couple of questions that I can't seem to locate the answers for and I hope someone can be of assistance. Here goes!
1) Are these the proper sending units for a 2003?
GM GENUINE 19421094Info
Left; ALSO ORDER SOCK KIT 12459862; EXCLUDES FFS OPTIONS
GM GENUINE 19420828 GM Original Equipment Info
Right; 2nd Design Fuel System (FFS)
Also, what is that sock kit?
2) I lent my fuel line disconnect tool which then disappeared. Any suggestion on the tool which makes the disconnect the easiest (or less hard)?
I'm hoping to replace the right side on my '01 this weekend so should know if these work on 01-02 and likely 03-04 right only. I think GM switched to dual electric pumps mid-year in '03 so your right side may be different.
Whatever the case, the 19421094 package includes a sock (fuel pump inlet strainer sock) that looks like what comes up when I google for "GM 12459862" so rock auto's part info is likely wrong there. Maybe it should read "includes 12459862 sock kit". Not the first time I've seen that. Try finding a set of front diff axle seals for a first gen Trailblazer. The auto parts stores that use the same system (Advance, CarQuest, possibly others) are equally confused / useless.
Also, there's no sock on the early design right tank venturi style pump.
Edit: BTW, I finally read the (very poorly printed) installation instructions that came with these senders, and notice this kit appears to be related to a TSB. Here's the first couple lines:
Application: Corvette Model Years 1997 through 2000
Purpose of Kit:
This procedure is to be used when servicing the level unit assembly for the applications noted. The purpose of this kit is to address a potential float arm sticking condition found in isolated cases.
I think this means the less "robust" wiper fingers were designed to reduce the likelihood of the segmented contact points getting "smeared" as was depicted in post #53.
Last edited by spfautsch; Jan 19, 2023 at 02:50 PM.
Considering this IS Florida, to paraphrase my dearly departed father (RIP dad!!) this morning was "Colder than a farmers *** on a frosty morning!!"
