New fuel sending unit

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barracudadave67

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I just received my new 5/16 sending unit I ordered thru Jegs. It was drop shipped from the distributor in Texas. It Jegs PN189-GT09-661S. It is not Chineseum. It's made in Tiawan.

I did on "ohms test" on it, and this is what the readings say. L (full tank) 8.2 Ohms
M (1/2 tank) 34.3 Ohms
H (on empty) 75.8 Ohms
This is just reading it new out of the box. I ask this cause I am wondering if anyone else has done this, on a new unit, and what readings you got.
I know aftermarket senders do not read right, but these Ohm readings seem pretty close to me. Maybe it will work closer to normal, tho I bet the least I will have to do is adjust the float.
This unit has a brass float like the originals.
Dave
 
My factory one read 11 ohms to 78 ohms, so pretty much in the ballpark.
 
The middle of the scale is where aftermarket is wrong. All OEM gauges and senders operate on a 80-10 range. A calculator says half way between 80 and 10 is 45 but the OEM gauge doesn't work that way. As the resistor wire in a thermal gauge heats up, its per inch and/or total resistance changes. So a proper non linear sender should signal approx' 34 ohms at 1/4 range, 23 ohms at 1/2 range, approx' 15 ohms at 3/4 range.
8 ohms really is too low in my opinion. It could overheat and damage a gauge, especially one that is aged.
Put you meter leads together to see what resistance there might be. 1 ohm in the meter/leads means a 7 ohm sender if that makes sense.
I'm sorry if this is TMI.
Bottom line, we have 2 choices...
We spend more coin to have a OEM sender properly restored or we buy a meter match module to alter the aftermarket senders signal to the gauge.
A aftermarket gauge might be a 3rd choice depending on what inst' panel you have. Good luck with it.
 
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Make sure the pickup tube reaches all the way to the bottom of the tank also. Chances are you'll have to bend it down a lot.
 
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