Fuel Sending Unit - Issues
#46
09-27-2018, 05:42 PM
Post Fiend
So I gets to thinking some more...
Obviously something is changing when the sender is installed. But what?
Try this. For now, let's take the gauge completely out of the equation. Let's stick to just a resistance reading from the sender's insulated terminal (the one to the gauge) and the ground point on the frame. Keep the sender's ground wire (to the frame) connected. In other words, I want the ohmmeter to see what the gauge would normally see.
Take a resistance reading with the sender not installed, but with the ground wire connected. Next, put the sender in the tank so it's making metal to metal contact, but do NOT install the locking ring yet. If the resistance changes just from the sender body touching the tank, then we know it's an electrical issue.
If no change yet, install and tighten the locking ring while watching the meter. If you now get a change, that would indicate a mechanical issue with the sender. Tightening the locking ring is warping something and somehow affecting the resistance of the sender.
Obviously something is changing when the sender is installed. But what?
Try this. For now, let's take the gauge completely out of the equation. Let's stick to just a resistance reading from the sender's insulated terminal (the one to the gauge) and the ground point on the frame. Keep the sender's ground wire (to the frame) connected. In other words, I want the ohmmeter to see what the gauge would normally see.
Take a resistance reading with the sender not installed, but with the ground wire connected. Next, put the sender in the tank so it's making metal to metal contact, but do NOT install the locking ring yet. If the resistance changes just from the sender body touching the tank, then we know it's an electrical issue.
If no change yet, install and tighten the locking ring while watching the meter. If you now get a change, that would indicate a mechanical issue with the sender. Tightening the locking ring is warping something and somehow affecting the resistance of the sender.
#47
09-27-2018, 06:24 PM
Join Date: Jun 2014
Location: Denton, TX
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I got home after work and tried to run through all these tests again and tried to install it with the float at “half” but couldn’t do it. So i finally said forget it and hooked it back up. I drove around for about ten minutes with he gauge still reading empty. Went to the gas station, put about 3/8 worth of a tank (till it’s full) and still nothing. Then after 15 more minutes i looked down and the gauge was at full! No idea if it’s really working now, but it’s the first time it’s read full and the tank is, in fact, full.
I don’t think i did anything differently, so I’m hesitant to think that the issue is completely resolved. Maybe it’s just a faulty unit that decided to work for a little bit.
Thanks for yalls help, I’ll update the thread as i see any change. His has been one of the more confusing issues I’ve run into.
I don’t think i did anything differently, so I’m hesitant to think that the issue is completely resolved. Maybe it’s just a faulty unit that decided to work for a little bit.
Thanks for yalls help, I’ll update the thread as i see any change. His has been one of the more confusing issues I’ve run into.
#48
09-27-2018, 07:39 PM
Join Date: Jun 2014
Location: Denton, TX
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