Clarifying some points, the gauge position is determined by a resisted ground circuit. Inside the sender is a resister card that varies resistance from 73 ohms (full) to 10 ohms (empty). that resistance value is deciphered by the regulator on the back of the gauge. It’s a capacitance type of regulator so the gauge doesn’t bounce all over the place as the fuel level gets sloshed around during driving. I’m currently diagnosing a concern with my ‘75. Fuel gauge is constantly on empty, regardless of actual fuel level. Right now there is 28.7 ohms between the signal (blue wire) and chassis ground. This indicates the sender sees the level slightly below full. So I might have a problem with either the voltage regulator or the gauge itself. Hope this helps everyone reading this.
Hello. I know you posted this 4 years ago. Did you find a solution? My gauge is reading empty at all times. If I ground the connecting wire it reads full. I can see the difference in ohms resistance when I engage the sending unit, but the gauge doesn’t. Any tips?
i thought my fuel gauge vibrator was bad so i thought to replace it but before that i needed to fix my lights so i replaced all my fuses and my gauge ended up working! before doing these test replace the fuses it could just be a faulty one
There's a wire that goes from the gas gauge in the speedo to the sender in the tank. If that wire has found a ground, shorted to ground, I'd expect the symptoms you describe. I'd look for that first.
You might run the same test as I've shown, swing the float to the E stop and the F stop, see if the gauge matchs that motion. If not, try a new sender, if no improvement, the gauge might be the problem. I notice you have a Manx or Manx-style buggy, are you using the stock gauge in the VW speedometer, or a separate VDO gauge? Last, as Bruce Meyers explained to me, the gas tank in a buggy is at a not-stock angle, so it never fills up completely, maybe one or two gallons unavailable.
Clarifying some points, the gauge position is determined by a resisted ground circuit. Inside the sender is a resister card that varies resistance from 73 ohms (full) to 10 ohms (empty). that resistance value is deciphered by the regulator on the back of the gauge. It’s a capacitance type of regulator so the gauge doesn’t bounce all over the place as the fuel level gets sloshed around during driving. I’m currently diagnosing a concern with my ‘75. Fuel gauge is constantly on empty, regardless of actual fuel level. Right now there is 28.7 ohms between the signal (blue wire) and chassis ground. This indicates the sender sees the level slightly below full. So I might have a problem with either the voltage regulator or the gauge itself. Hope this helps everyone reading this.
Hello. I know you posted this 4 years ago. Did you find a solution? My gauge is reading empty at all times. If I ground the connecting wire it reads full. I can see the difference in ohms resistance when I engage the sending unit, but the gauge doesn’t. Any tips?
Cool video thank for sharing! The gage usually got a set screw below the bracket. On the older ones they do anyways 61-67 i think =)
Sorry to hear about the cat. Nice Beetle BTW but hearing the news about the cat has ruined my day. Sitting there like a soldier....
Max lived a long time, never got hit by a car, his decline was thankfully swift.
Get the Jeep, get the Honda, get the cat, get me talking, WAY TOO MUCH!
i thought my fuel gauge vibrator was bad so i thought to replace it but before that i needed to fix my lights so i replaced all my fuses and my gauge ended up working! before doing these test replace the fuses it could just be a faulty one
I have a 73 super, and my gauge says its full. And when I turn the car off it goes all the way down. Could you advise?
There's a wire that goes from the gas gauge in the speedo to the sender in the tank. If that wire has found a ground, shorted to ground, I'd expect the symptoms you describe. I'd look for that first.
+guidoguitar thanks so much...
The only thing you needed to apologize for was coughing in my F*cking EAR!!! Nice cat, by the way...
You might run the same test as I've shown, swing the float to the E stop and the F stop, see if the gauge matchs that motion. If not, try a new sender, if no improvement, the gauge might be the problem.
I notice you have a Manx or Manx-style buggy, are you using the stock gauge in the VW speedometer, or a separate VDO gauge?
Last, as Bruce Meyers explained to me, the gas tank in a buggy is at a not-stock angle, so it never fills up completely, maybe one or two gallons unavailable.
Where's the kill switch?
yeah I think this guy just like to listen to himself talk
That was fun
nice cat
Dude, finish da video. My VDO sender only marks from emty to 1/4tank. dont wanna reach fuel. I though your video would help.. Guess not,
Useless!
cat cat cat
Max went to cat heaven earlier this year, but will live forever in videos
:(
man, you talk too much