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Fuel sending unit stopped working
#1321966 Thu Aug 15 2019 03:49 PM
Joined: Oct 2000
Posts: 209
B
Shop Shark
The new fuel sending unit in my 1953 GMC stopped working after being installed after a week. It worked after putting gas in the newly installed tank and a week later it showed empty. Any ideas ?

Re: Fuel sending unit stopped working
buckaroo01 #1321968 Thu Aug 15 2019 03:51 PM
Joined: Apr 2005
Posts: 8,657
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Grounds, grounds, grounds! Make sure EVERY one of them is clean and bare metal. If you did this during install do it again. Hope this cures your problem.šŸ› 


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
ā€˜65 Chevy Biscayne 4dr 230 I-6 one owner (Iā€™m #2)
ā€˜39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: Fuel sending unit stopped working
buckaroo01 #1321971 Thu Aug 15 2019 04:29 PM
Joined: Mar 2014
Posts: 114
G
Shop Shark
I found with mine that the sender terminal (non-ground) was making contact with the plate of the sender, effectively grounding it. This the result of a very small grommet that's supposed to isolate it, and possibly me tightening it too much. If this is your problem, you can tell it easily by loosening a little and moving the wire on the sender terminal. I replaced the grommet on mine, and then was very careful to make sure the stud was centered in the hole when I tightened it. Good luck.


Greg Brown
'49 Chevy 3100
Re: Fuel sending unit stopped working
buckaroo01 #1321972 Thu Aug 15 2019 04:36 PM
Joined: Mar 2014
Posts: 1,398
J
Shop Shark
However it might not be just the ground. A couple of years ago I showed with images how 90 ohm sending units are converted to 30 ohm units. Solder is crudely dropped on the winding until the ohm gauge hits approximately 30...after all anyone who didn't sleep through electronics 101 knows you only need to connect those winding wires to reduce resistance. What this does is create dead spots, spots where the gauge is given either the wrong or no electrical input and this mickey-mouse approach can cause the tiny wire in the winding to break. I bought one of these senders from a well-known supplier of parts which a lot of people seem to trust. It was trash from the word go. I won't tell you the supplier's name because he didn't make it, but I will tell you he refused to refund my money and always overcharges for shipping. The best (and I mean the best by a very long shot) sending unit is sold on eBay by a seller whose ID is renbusan. He and I have communicated and he knows his stuff. Here is the unit you want:

https://tinyurl.com/y3lhydzg

Here is what the Chinese-modified sender looked like when I finally got so tired I removed it and took it apart:
(first image)

The second image shows what the unit renbusan sells is like...nylon, neat & clean with the windings set into nylon and not running in a U shaped arc but running in a C shape with a wiper arm. Much better design. Good luck!

Attached Files
IMG_8462.JPG (62.76 KB, 134 downloads)
IMG_8454.JPG (97.2 KB, 134 downloads)

Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Fuel sending unit stopped working
buckaroo01 #1322035 Fri Aug 16 2019 01:34 AM
Joined: Mar 2010
Posts: 9,223
5
Master Gabster
I have gone through 3 brand new sending units which had leaky brass floats shortly after installing them. I went on ebay and ordered plastic floats for a Jeep.
Worked like a charm.

Re: Fuel sending unit stopped working
buckaroo01 #1322090 Fri Aug 16 2019 02:37 PM
Joined: Jan 2002
Posts: 2,082
C
Shop Shark
Agree with 52Carl. Float leaks is very common with today's production of sending units if checking your grounding doesn't resolve the issue.


Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: Fuel sending unit stopped working
buckaroo01 #1322175 Sat Aug 17 2019 03:18 AM
Joined: Jul 2000
Posts: 979
G
Shop Clutterist
We can't look at your C: drive.

Is this what you meant?
https://www.omix-ada.com/sending-unit-float-55-86-jeep-cj-models.html


Gord
----
1954 1/2 ton 235 4 speed
Re: Fuel sending unit stopped working
buckaroo01 #1322235 Sat Aug 17 2019 03:23 PM
Joined: Mar 2002
Posts: 8,997
Master Gabster
If the unit connector is shorting to ground, it will register empty. It is not caused by a bad ground connection.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Fuel sending unit stopped working
Gord&Fran #1322266 Sat Aug 17 2019 08:25 PM
Joined: Mar 2010
Posts: 9,223
5
Master Gabster
Originally Posted by Gord&Fran
We can't look at your C: drive.

Is this what you meant?
https://www.omix-ada.com/sending-unit-float-55-86-jeep-cj-models.html

Well I'm glad you can't access my C: drive!!!
Thanks for the help with the link.


Moderated by  Rusty Rod 

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