fuel sender reesistance
05-09-2012, 09:18 PM
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fuel sender reesistance
Ive looked and looked and cannot seem to find what I am looking for. What is the full and empty resistance on a 87 xj stock fuel sender? Thanks
05-09-2012, 09:22 PM
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I would need to look myself, might start here: https://www.cherokeeforum.com/f51/he...ix-links-1397/
Last edited by DFlintstone; 05-09-2012 at 11:15 PM.
05-09-2012, 09:41 PM
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Found it in the FSM....hiding under "instrument panel!----
100*-1365~~~~220*-93.5~~~~260*-55 ohms.
WHOOPS!...right, fuel.
100*-1365~~~~220*-93.5~~~~260*-55 ohms.WHOOPS!...right, fuel.
Last edited by DFlintstone; 05-09-2012 at 11:19 PM.
05-10-2012, 12:02 AM
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Well Im putting in all autometer gauges and want to make sure i get the right or the closest range gauge while still using the factory sender.
05-10-2012, 02:04 AM
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Grab a 1K ohm potentiometer and pair of clip leads. (radio shack).
Clip left terminal of potentiometer to ground. Clip center terminal of potentiometer to sender wire that normally feeds the gauge, after unplugging from sender.
Adjust potentiometer until gauge being tested reads zero.
Unclip potentiometer, being careful not to disturb it's setting, and measure resistance between left and center terminals. That's your sender's "zero", "empty" "cold" etc resistance.
Repeat, only adjust potentiometer until gauge reads full scale. Disconnect and measure resistance between terminals again. That's the sender's full-scale resistance.
This only works with senders that present a variable resistance....temp, oil, fuel. And it may not work on 97+ as the oil/temp signals are buffered and played with by the PCM
Clip left terminal of potentiometer to ground. Clip center terminal of potentiometer to sender wire that normally feeds the gauge, after unplugging from sender.
Adjust potentiometer until gauge being tested reads zero.
Unclip potentiometer, being careful not to disturb it's setting, and measure resistance between left and center terminals. That's your sender's "zero", "empty" "cold" etc resistance.
Repeat, only adjust potentiometer until gauge reads full scale. Disconnect and measure resistance between terminals again. That's the sender's full-scale resistance.
This only works with senders that present a variable resistance....temp, oil, fuel. And it may not work on 97+ as the oil/temp signals are buffered and played with by the PCM
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05-10-2012, 01:55 PM
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I put one in one of my old Cherokees an it moved like crazy. When you slowed down or went around a corner the needle moved as much as the tach I put in. You may want to contact Autometer to see if their is a fix for the quick readings
05-10-2012, 08:39 PM
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