Gas Tank ?
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Laughing Gas
Joined: Jul 2004
Posts: 769
Likes: 3
Gas Tank ?
Hello
I was wondering if anyone can tell me how to test a sending unit in a tank. I have a good used gas tank complete with the sending unit. I am wanting to use it as is but would like to test the fuel sending unit before I take out my old tank and put in this used one. Any help would be greatly appreciated.
Thanks
I was wondering if anyone can tell me how to test a sending unit in a tank. I have a good used gas tank complete with the sending unit. I am wanting to use it as is but would like to test the fuel sending unit before I take out my old tank and put in this used one. Any help would be greatly appreciated.
Thanks
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Laughing Gas
Joined: Jul 2004
Posts: 769
Likes: 3
I done a search and was wondering if the procedure is the same if it is in a used tank as opposed to being out of the car. Here is the procedure I found.
A fuel sending unit is a rheostat (variable resistor, also called a potentiometer). As the float moves up and down, the resistance changes. Clip a multimeter to each of the leads on the top of the sending unit. Hold the sending unit upright, and let the float drop. Your meter should read 70 ohms. As you move the float upward, you should see the resistance drop. Once the float is in the highest position, your meter should read 10 ohms.
Also make sure that the float actually floats - the float is made out of two halves of brass that are soldered together. The most common problem is that the solder ruptures and gas seeps into the float, and the float sinks to the bottom of the tank. This makes the fuel gauge read empty permanently
A fuel sending unit is a rheostat (variable resistor, also called a potentiometer). As the float moves up and down, the resistance changes. Clip a multimeter to each of the leads on the top of the sending unit. Hold the sending unit upright, and let the float drop. Your meter should read 70 ohms. As you move the float upward, you should see the resistance drop. Once the float is in the highest position, your meter should read 10 ohms.
Also make sure that the float actually floats - the float is made out of two halves of brass that are soldered together. The most common problem is that the solder ruptures and gas seeps into the float, and the float sinks to the bottom of the tank. This makes the fuel gauge read empty permanently
Elder User
Joined: Jan 2010
Posts: 551
Likes: 0
From: New Braunfels, TX
Are you trying to figure out if the sending unit will give you a reading on the fuel guage? Then yes your previous would be the route used but I'm not sure the exact ohm readin you should get.
Otherwise the sending unit technicaly doesnt send, the fuel pump draws fuel threw it (pressure system). Hope that answers your question.
Boomer
Otherwise the sending unit technicaly doesnt send, the fuel pump draws fuel threw it (pressure system). Hope that answers your question.
Boomer
Thread Starter
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Laughing Gas
Joined: Jul 2004
Posts: 769
Likes: 3
Are you trying to figure out if the sending unit will give you a reading on the fuel guage? Then yes your previous would be the route used but I'm not sure the exact ohm readin you should get.
Otherwise the sending unit technicaly doesnt send, the fuel pump draws fuel threw it (pressure system). Hope that answers your question.
Boomer
Otherwise the sending unit technicaly doesnt send, the fuel pump draws fuel threw it (pressure system). Hope that answers your question.
Boomer
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