Fuel gauge repaired

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cjmark
Contributor

Posts: 19

First Name: Mark

Fuel gauge repaired Mar 31, 2018 16:44:27 GMT -5

Quote

Post by cjmark on Mar 31, 2018 16:44:27 GMT -5

Hey everyone,
It’s nice to have a working fuel gauge, I was tired of throwing a 2 gallon container in back for every test ride and don’t like idea of putting a stick in the tank.

The old tank sender kind of worked (resistance check) but it looked original and not trust worthy, so a call to RFJP on Monday got me a new sending unit by Friday along with a nice new parts catalog.

The real problem was the gauge pegged at Full when key on. After reading Sean’s troubleshooting article on The CJ2A Page my problem was open circuit between IGN SW (6v) and ground caused by either fried wire or bad ground within gauge. I do have 12v system with ballast resistor feeding gauge. Apart came the gauge (very carefully), I got lucky, bad ground in gauge

All working now and seems to be calibrated to right level of gas (2” of gas, 1/4 tank).

Didn’t see spot under Fuel System board so posting in back room.
Mark

www.thecj2apage.com/forums/why-doesnt-my-gas-gauge-work_topic17875.html

1946 CJ2A CJMan on thecj2apage.com
1971 CJ5 CJMark on earlycj5.com

Scoutpilot Administrator Posts: 2,727	Fuel gauge repaired Mar 31, 2018 19:13:54 GMT -5 cjmark likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Scoutpilot on Mar 31, 2018 19:13:54 GMT -5 I think I can find room for this up front. Note your new status as a welcome contributor. Thanks.
	Last Edit: Mar 31, 2018 19:14:27 GMT -5 by Scoutpilot Old fashioned service never goes out of style. “The bitterness of poor quality remains long after the sweetness of low price is forgotten.” ― Benjamin Franklin

gmcjr KJRT Posts: 932 First Name: Gary	Fuel gauge repaired Mar 31, 2018 22:43:44 GMT -5 cjmark likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by gmcjr on Mar 31, 2018 22:43:44 GMT -5 What!!!!??? Working gas guage in a Willis?? Just kidding, thumbs up on a good job! I need to repair mine, I've ran out of gas twice in recent history......
	Last Edit: Mar 31, 2018 22:44:08 GMT -5 by gmcjr We have miles to jeep before we sleep! “Keep the Lord in your heart, and keep your powder dry.” from the song “In The Mean Time” by Chris Knight.

oilleaker1
Full Professor

Full Professor

Has Jeep Disease

Posts: 2,022

Fuel gauge repaired Apr 1, 2018 5:51:23 GMT -5 cjmark likes this

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Post by oilleaker1 on Apr 1, 2018 5:51:23 GMT -5

Thanks Mark. I didn't know that ground was within like that. Note: if your sender came with a plastic float, it will fail. The metal swing arm where it snaps into the float groove will crack it at the pressure point of the loop end. Buy yourself a 1965 Mustang float. It will never leak since it's solid and has the same dimension and snap in groove. ebay has the float cheap! I keep one around now since ALLLLLL my plastic floats failed. White or black, didn't matter. John

cjmark
Contributor

Posts: 19

First Name: Mark

Fuel gauge repaired Apr 1, 2018 17:38:10 GMT -5 via mobile

Quote

Post by cjmark on Apr 1, 2018 17:38:10 GMT -5

Apr 1, 2018 5:51:23 GMT -5 oilleaker1 said:

Thanks for the tip, I’ll check eBay for the Mustang float, the one I put in is white plastic.

Yeah the inside of gauge wasn’t corroded, I think brass ground tab just got tired and needed a little “spring”. I’ll see about posting pic of can, can’t do in reply.

Sean’s article is great had problem figured out before I even opened gauge, knew it was in the Empty circuit.
Mark

1946 CJ2A CJMan on thecj2apage.com
1971 CJ5 CJMark on earlycj5.com

cjmark Contributor Posts: 19 First Name: Mark	Fuel gauge repaired Apr 1, 2018 17:47:47 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by cjmark on Apr 1, 2018 17:47:47 GMT -5 Pic of inside of gauge, not corroded, bad ground between brass tab and back of inside gauge housing.
	1946 CJ2A CJMan on thecj2apage.com 1971 CJ5 CJMark on earlycj5.com

cjmark Contributor Posts: 19 First Name: Mark	Fuel gauge repaired Apr 5, 2018 19:53:29 GMT -5 Scoutpilot and rickg like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by cjmark on Apr 5, 2018 19:53:29 GMT -5 Good feeling having brass float in sender instead of plastic.
	1946 CJ2A CJMan on thecj2apage.com 1971 CJ5 CJMark on earlycj5.com

oilleaker1 Full Professor Full Professor Has Jeep Disease Posts: 2,022	Fuel gauge repaired Apr 6, 2018 18:45:04 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by oilleaker1 on Apr 6, 2018 18:45:04 GMT -5 All, without exception, of my many plastic floats have failed. You are good to go! Oilly

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