Fuel Gauge/ Fuel voltage regulator / Fuel tank sender ??

[milflyer]

Evening all

Since buying my US import VW Karmann Cabriolet the fuel gauge has only ever indicated a 1/4 tank of fuel even though the tank was full.

A local garage said it would be the tank sender ... so I've changed it but nothing has changed!

Left in the system is the actual fuel gauge or it's voltage regulator.

Is there a test for the gauge/voltage regulator and or a fault test for the new tank sender in case its faulty.

Many thanks

John

PS: The tank sender I fitted as specifically for the 1302/1303

[Cusser]

Remove the sending unit, and measure ohms resistance when the floats are all the way down, and when the floats are all the way up. Compare to specifications. Resistance of a sender for full tank should be 10-12 ohms and around 70 for empty.

And there should be gradual change in ohms as the floats are moved through the "throw", and no "opens" of zero resistance.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

[milflyer]

Thanks Cusser ... that's a start ...

I think I also read somewhere there is a test for the Speedometer end too?

[baldessariclan]

[milflyer]

Great response folk ... really appreciate the replies

Should there be anything else to check?

Thank you

[milflyer]

[heimlich]

If you are using an aftermarket gauge and/or sending I have a device I am testing showing very good results. It should be in production very soon. It attached to the back of the speedometer just as you would the vibrator. It fixes the issue with the aftermarket sender and gauge not reading correctly.
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[milflyer]

Good evening Heimlich

Thank you very much for your message!

I'm very interested in what you have to offer, more details would be most welcome.

Please keep me updated

Thank you

Kind regards

John
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Bug#1 "1200CC - BBN446L" / Bug#2 "1302S HUE472L" / Bug#3 "Karmann Cabroilet NFC798S"