Fuel Sender Unit
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Joined: Sep 2006
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From: Wiltshire
Fuel Sender Unit
Hi.
I was wondering if anybody can help me.
I have just taken my fuel tank out and I would like to test the fuel sender unit does anybody know how to do this?
I tried to connect it back onto the car but the fuel gauge now seems to read full and won't budge, this would be great, as it would mean I would never have to fill the tank up again
But unfortunatly it is not in the tank.
I was wondering if anybody can help me.
I have just taken my fuel tank out and I would like to test the fuel sender unit does anybody know how to do this?
I tried to connect it back onto the car but the fuel gauge now seems to read full and won't budge, this would be great, as it would mean I would never have to fill the tank up again
But unfortunatly it is not in the tank.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The fuel sender is a simple unit that is basically called a POT or a variable potentiometer. A potentiometer is a resistor that will change the resistance on a wire when moved up or down a wrapped resistance wire. The sending unit is easy to check too! The Ohms resistance should read 0 for empty and 90 for full for all C2 and c-3 cars. C-1 cars had a different resistance of ohms for full (32 Ohms is full).
If you are having problems with your sending unit or dash unit, it’s a simple test to see which is bad. Ground out the Ohms wire (tan) that fees a resistance reading to the gauge in the dash! Do this at the sending unit and the dash gauge should go to a “buried” full reading. If you do this at the back of the tank and the gauge pegs full, then you know you have a problem with the sender. If the gauge won’t peg, then you either have a problem with the dash gauge or you have a problem with the wires that feed the ohms reading to the gauge.
More times than not, a dash gauge that is stuck on a pegged full reading has a shorted wire!
Willcox
If you are having problems with your sending unit or dash unit, it’s a simple test to see which is bad. Ground out the Ohms wire (tan) that fees a resistance reading to the gauge in the dash! Do this at the sending unit and the dash gauge should go to a “buried” full reading. If you do this at the back of the tank and the gauge pegs full, then you know you have a problem with the sender. If the gauge won’t peg, then you either have a problem with the dash gauge or you have a problem with the wires that feed the ohms reading to the gauge.
More times than not, a dash gauge that is stuck on a pegged full reading has a shorted wire!
Willcox
Le Mans Master
Joined: Sep 2002
Posts: 5,236
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From: Myrtle Beach SC
Originally Posted by UK Jerry
Hi.
I was wondering if anybody can help me.
I have just taken my fuel tank out and I would like to test the fuel sender unit does anybody know how to do this?
I tried to connect it back onto the car but the fuel gauge now seems to read full and won't budge, this would be great, as it would mean I would never have to fill the tank up again
But unfortunatly it is not in the tank.
I was wondering if anybody can help me.
I have just taken my fuel tank out and I would like to test the fuel sender unit does anybody know how to do this?
I tried to connect it back onto the car but the fuel gauge now seems to read full and won't budge, this would be great, as it would mean I would never have to fill the tank up again
But unfortunatly it is not in the tank.
Thread Starter
Advanced
Joined: Sep 2006
Posts: 67
Likes: 0
From: Wiltshire
Thank you for all your help,tested the sender unit and found a bad conection, took it apart and hey presto it now all works
, so once again many thanks
. 1 less thing to fix on my ever ending list.
, so once again many thanks . 1 less thing to fix on my ever ending list.
