| [ Total Views: 944 | Total Replies: 10 | Thread Id: 110414 ] |
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 jakeandco1958
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| posted on January 14th, 2016 at 10:19 PM |
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Fuel gauge inaccurate
I have a 1971 Ve beetle that reads only half full when I fill up the tank. To date to remedy this I have done the following. Fitted a brand new
gauge, tank sender and voltage stabiliser. All these new parts and still same issue. I have also placed an additional earth wire from the back of
the speedo assembly in the event it was a bad earth. No change. I then tried a different power source to the stabiliser. No change. I ran a new
wire from tank sender to rear of gauge. Again no change. I'm out of ideas if anyone can help.
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ragged
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| posted on January 14th, 2016 at 10:52 PM |
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Try putting an earth from the chassis/body to the sender unit. Dave
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shokwave2
A.k.a.: Matt Hamilton
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| posted on January 15th, 2016 at 03:49 AM |
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Mine did the same thing. I fixed it by removing the sender and bending the arm of it down a bit. That way the lower fuel level pushes the arm up
earlier, if that makes any sense. I wouldn't worry what it reads when full, just know what it reads when near empty.
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AA003
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| posted on January 15th, 2016 at 06:02 AM |
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When replacing the sender unit you have to adjust the arm and the two stops.
I read it on samba, so it must be correct.
Sometimes Volkswagen dealers sell spare parts. Amazing isn't it!
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jakeandco1958
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| posted on January 15th, 2016 at 06:03 AM |
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thanks gents Ill try the earth option first and then maybe the sender one afer that. cheers
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 Yogie
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| posted on January 15th, 2016 at 02:21 PM |
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You need to check what the readings should be for your fuel gauge when full and also when empty. Take out the fuel sender and with your ohmmeter,
adjust (bend) the arms until you get the correct readings to match the factory settings. Put the sender back in and you should be fine. Do check the
earth first though.
Yogie
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nbturbo
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| posted on January 15th, 2016 at 03:35 PM |
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71 VW's I have seen don't have a float arm-its a float inside an ally tube.I had one apart recently and it looks like nothing can be altered.The VW
fuel gauges operate between 10 and 73 ohms.You need to select a sender that operates between those numbers.
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Yogie
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| posted on January 15th, 2016 at 03:49 PM |
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| Quote: | Originally
posted by nbturbo
71 VW's I have seen don't have a float arm-its a float inside an ally tube.I had one apart recently and it looks like nothing can be altered.The VW
fuel gauges operate between 10 and 73 ohms.You need to select a sender that operates between those numbers.
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That could well be true. Our 68 beetle has a single arm with a float on it yet our 72 has 2 arms with floats on them both but our 72 ghia has the
cylinder that you describe. Some Kombi's also have the cylinder and I am not sure how to check the calibration for them.
Yogie
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modnrod
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| posted on January 16th, 2016 at 06:11 AM |
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For the OP....
The senders have a resistive strip, and as the float goes up and down there is a metal tab that rubs on that strip. When the float is all the way down
then putting a multimeter between earth (body of the sender unit) and the output lead it should read about 10Ohms, and when you move the float up it
should read about 73Ohms (10-73 as Greg said). Don't be too worried if it reads 4-84 or something, it will still function OK on the gauge.
Oh, and I once had this gauge that did that on a customers car, and I found the needle was just slightly touching the glass and catching. 
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 vw54
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| posted on January 16th, 2016 at 09:27 AM |
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How does it read when low in fuel that's more important you don't want to run out
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nbturbo
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| posted on January 16th, 2016 at 02:48 PM |
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Check this out
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