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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 05-06-2020, 11:18 PM   #1
revenge240
 
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Project 240sx back to life: fuel sending unit assembly

Hey everyone! Hope all is well.
So finally bringing my 91 240sx with a red top SR20DET back to life after sitting for the past 6 years and need some advice.
I checked the fuel circuit using the FSM and some well documented forum posts and found that on the body/chassis side, everything works (relays, fuses, harness continuity), but the fuel pump is not priming. Thus, I removed it and discovered this:



The assembly looks bad but I'm wondering if it's salvageable? Can I clean it up, put in new wires and a pump and get it to work, or will I need to find another assembly? Those wires look pretty bad and not sure if I can remove these and put new ones in, anyone ever done that before here?
The fuel level sender actually works and does send the proper level to the gauge so that's okay but the pump just doesn't prime anymore. Of course, I'm going to drop the gas tank and clean it up, but would like to know if this thing is save-able before I drop a couple hundred on a new assembly and pump.
I'll also use this thread to post my build as time goes on so wish me luck! Been a member since I swapped to the redtop back in 2011 so excited to get her running again
Thanks in advance!!
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Old 05-07-2020, 04:29 AM   #2
NukeKS14
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Hopefully you can get the tank cleaned out. Was that left half full of e85 for 6 years!? Wow that looks bad. Personally I wouldnt reuse the sending unit. Thats just me.

Ebay or a junk yard is going to be your friend here. Good luck.
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Old 05-07-2020, 09:11 AM   #3
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Quote:
Originally Posted by NukeKS14 View Post
Hopefully you can get the tank cleaned out. Was that left half full of e85 for 6 years!? Wow that looks bad. Personally I wouldnt reuse the sending unit. Thats just me.

Ebay or a junk yard is going to be your friend here. Good luck.
Coincidentally, it was left about half full of 91 or 100 octane gas. I can understand rust if water got into the tank but not sure why the wiring looks like that.
I?ll just have to be patient on finding a used one because $450 for a new sending unit without a pump is a bit pricey.
I might be able to clean most of the rust off this thing but don?t know if I can use regular wiring and solder it up to those connection points.
Thanks!
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Old 05-07-2020, 10:08 AM   #4
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Yeah always leave the tank full of gas and add Stabil if it's going to sit for any amount of time.

https://www.ebay.com/i/333590605859?...RoC3HEQAvD_BwE


$200 for a used one...
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Old 05-07-2020, 11:59 AM   #5
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Quote:
Originally Posted by NukeKS14 View Post
Yeah always leave the tank full of gas and add Stabil if it's going to sit for any amount of time.

https://www.ebay.com/i/333590605859?...RoC3HEQAvD_BwE


$200 for a used one...
Lesson learned for sure. Didn?t know about the tank being completely full before parking it, thanks!
I saw that one on eBay and might have to snag it.
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