| [ Total Views: 950 | Total Replies: 10 | Thread Id: 110414 ] |
|
|
 jakeandco1958
Commited Dubber
Posts: 51
Threads: 26
Registered: August 1st, 2012
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on January 14th, 2016 at 10:19 PM |
|
|
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.
|
|
|
ragged
A.k.a.: David
Wolfsburg Wizard
Just ask if you need HELP!
Posts: 478
Threads: 46
Registered: January 25th, 2005
Member Is Offline
Location: Adelaide
Theme: UltimaBB Pro Blue
Mood: Medication seems to be working
|
| posted on January 14th, 2016 at 10:52 PM |
|
|
Try putting an earth from the chassis/body to the sender unit. Dave
|
|
|
shokwave2
A.k.a.: Matt Hamilton
Officially Full-On Dubber
Posts: 289
Threads: 28
Registered: March 7th, 2010
Member Is Offline
Theme: UltimaBB Psyche Blue
|
| posted on January 15th, 2016 at 03:49 AM |
|
|
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.
|
|
|
AA003
A.k.a.: Phill
Custom Title Time!
Posts: 1189
Threads: 39
Registered: October 27th, 2011
Member Is Offline
Location: Southern Highlands
Theme: UltimaBB Streamlined2
|
| posted on January 15th, 2016 at 06:02 AM |
|
|
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!
|
|
|
jakeandco1958
Commited Dubber
Posts: 51
Threads: 26
Registered: August 1st, 2012
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
| posted on January 15th, 2016 at 06:03 AM |
|
|
thanks gents Ill try the earth option first and then maybe the sender one afer that. cheers
|
|
|
 Yogie
Super Moderator
Posts: 1603
Threads: 108
Registered: June 7th, 2003
Member Is Offline
Location: Brisbane
Theme: UltimaBB Pro Blue
|
| posted on January 15th, 2016 at 02:21 PM |
|
|
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
|
|
|
nbturbo
Veteran Volks Folk
Posts: 2171
Threads: 89
Registered: December 19th, 2002
Member Is Offline
Location: Whyalla Sth.Aust.
Theme: UltimaBB Powder
|
| posted on January 15th, 2016 at 03:35 PM |
|
|
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.
|
|
|
Yogie
Super Moderator
Posts: 1603
Threads: 108
Registered: June 7th, 2003
Member Is Offline
Location: Brisbane
Theme: UltimaBB Pro Blue
|
| posted on January 15th, 2016 at 03:49 PM |
|
|
| 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.
|
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
|
|
|
modnrod
Fahrvergnugen
Posts: 978
Threads: 50
Registered: March 17th, 2011
Member Is Offline
Location: Midwest, Westoz.
Theme: UltimaBB Pro Blue
Mood: Old School Volksies!
|
| posted on January 16th, 2016 at 06:11 AM |
|
|
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. 
|
|
|
 vw54
Super Administrator
Always Waiting 4 Friday
Posts: 16723
Threads: 378
Registered: August 26th, 2002
Member Is Offline
Location: Sunny Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Oval resto ongoing
|
| posted on January 16th, 2016 at 09:27 AM |
|
|
How does it read when low in fuel that's more important you don't want to run out
|
|
|
nbturbo
Veteran Volks Folk
Posts: 2171
Threads: 89
Registered: December 19th, 2002
Member Is Offline
Location: Whyalla Sth.Aust.
Theme: UltimaBB Powder
|
| posted on January 16th, 2016 at 02:48 PM |
|
|
Check this out
| Error |
| Sorry, you must be a registered user in order to download attachments. |
|
|
|
|
