OHM reading on fuel sender
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Senior User
Joined: Nov 2003
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From: Southern Oregon
OHM reading on fuel sender
Sorry for all the posts lately I just have a bunch of crap that keeps popping up on this truck.
So 77 f250 rear tank fuel sending unit, what is the stock sending unit read in way of ohms? And second how do I check this? I have meter and I have the bed off. (Big help there I'm sure )
So 77 f250 rear tank fuel sending unit, what is the stock sending unit read in way of ohms? And second how do I check this? I have meter and I have the bed off. (Big help there I'm sure )
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,094
Likes: 5,756
From: S/W Missouri, Polk county
"Disconnect the wire that goes to the fuel sending unit at the tank. Ground that wire to the frame, making sure the frame is clean. Turn the ignition to the "run" position and watch the fuel gauge. If the gauge swings all the way to full, either the sending unit itself is bad or it has a bad ground. If the gauge stays on empty then either the gauge is bad or there is a wiring problem."
Hang in there, someone will answer that ohm question, till them 70 to 20 ohms.
https://www.ford-trucks.com/forums/1...l#post17621809
Advanced search using "fuel gauge sending unit ohm".
https://www.ford-trucks.com/forums/s...rchid=26072231
Hang in there, someone will answer that ohm question, till them 70 to 20 ohms.
https://www.ford-trucks.com/forums/1...l#post17621809
Advanced search using "fuel gauge sending unit ohm".
https://www.ford-trucks.com/forums/s...rchid=26072231
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
I can't remember the exact ohm range for your truck but since you have easy access, just pull it out and do a sweep test with the ohm meter if you didn't find a problem on the quick test mentioned above. You might find the float is in the bottom of the tank or other issues. If the ohm meter sweeps a range while you move the arm, it's probably ok. Simple google search should find the ohm range if nobody here offers it up.
Mountain Pass
Joined: Oct 2017
Posts: 213
Likes: 6
From: Maysville, Ky
To check the sender for proper resistance with a multi meter;
1) Pull the sender out of tank.
2) Set the multi meter to the Ohm setting.
3) Clamp or touch the red probe to the connector in the center of the sender and the black probe to the ground tab (or anywhere on the sealing ring).
4) Move the float arm up and down while watching the readings on the meter. The readings should be around 10 full (up) and somewhere around 70 to 73 empty (down).
If the readings are close that's OK. You can spray some cleaner into the sender cover if it looks about right and reinstall. Also check the float out and if it looks iffy might as well replace it while you have it out.
Mark.
1) Pull the sender out of tank.
2) Set the multi meter to the Ohm setting.
3) Clamp or touch the red probe to the connector in the center of the sender and the black probe to the ground tab (or anywhere on the sealing ring).
4) Move the float arm up and down while watching the readings on the meter. The readings should be around 10 full (up) and somewhere around 70 to 73 empty (down).
If the readings are close that's OK. You can spray some cleaner into the sender cover if it looks about right and reinstall. Also check the float out and if it looks iffy might as well replace it while you have it out.
Mark.
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Senior User
Joined: Nov 2003
Posts: 416
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From: Southern Oregon
To check the sender for proper resistance with a multi meter;
1) Pull the sender out of tank.
2) Set the multi meter to the Ohm setting.
3) Clamp or touch the red probe to the connector in the center of the sender and the black probe to the ground tab (or anywhere on the sealing ring).
4) Move the float arm up and down while watching the readings on the meter. The readings should be around 10 full (up) and somewhere around 70 to 73 empty (down).
If the readings are close that's OK. You can spray some cleaner into the sender cover if it looks about right and reinstall. Also check the float out and if it looks iffy might as well replace it while you have it out.
Mark.
1) Pull the sender out of tank.
2) Set the multi meter to the Ohm setting.
3) Clamp or touch the red probe to the connector in the center of the sender and the black probe to the ground tab (or anywhere on the sealing ring).
4) Move the float arm up and down while watching the readings on the meter. The readings should be around 10 full (up) and somewhere around 70 to 73 empty (down).
If the readings are close that's OK. You can spray some cleaner into the sender cover if it looks about right and reinstall. Also check the float out and if it looks iffy might as well replace it while you have it out.
Mark.
Thank you , I'll do this. The reason I need to know is because Im switching over to digital gauges and have to know the ohm's for my sending unit so I can set up the new gauge to read off the sending unit.
Elder User
Joined: Nov 2005
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From my recent work with my fuel tank, the proper sending unit for my 1975 f250 was 73 - 10 ohms. I verified with an ohm meter as well as hooking up the sending unit out of tank and manipulating the arm while noting the gauge reading.
Thread Starter
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Senior User
Joined: Nov 2003
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From: Southern Oregon
Yep thats just what I got when I checked it this morning thanks
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Elder User
Joined: Jan 2014
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From: Chillicothe, IA
here is a link to all the info you will ever want about Ford sending units.
Fuel Tank Sending Unit Tech - FORDification.com
Fuel Tank Sending Unit Tech - FORDification.com
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Thread Starter
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Senior User
Joined: Nov 2003
Posts: 416
Likes: 0
From: Southern Oregon
here is a link to all the info you will ever want about Ford sending units.
Fuel Tank Sending Unit Tech - FORDification.com
Fuel Tank Sending Unit Tech - FORDification.com
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