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Barnabus
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Joined: April 27, 2004
Posts: 223
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 Posted: Mon Jan 12, 2009 6:44 am Post subject: Fuel Sender Testing. |
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The Bentley only has replacement instructions. No testing specifications.
Anyone have the "good" resistance numbers for testing of a fuel sender / gas gauge.
THX.
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BarryL 
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Joined: November 01, 2004
Posts: 15477
Location: Casa de Oro, California
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| Posted: Mon Jan 12, 2009 9:19 am Post subject: |
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| I believe they are 0-180 or 10 -190 ohms. |
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Barnabus
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Joined: April 27, 2004
Posts: 223
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| Posted: Mon Jan 12, 2009 10:24 am Post subject: |
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thanks. just what I was looking for.
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Barnabus
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Joined: April 27, 2004
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| Posted: Mon Jan 12, 2009 7:28 pm Post subject: |
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I did some testing on my gauge tonight. Basically simulated a sender this is what i found.
Full: 4.5 ohms
3/4: 23.7 ohms
1/2: 47.5 ohms
1/4: 67.1 ohms
Empty:83.8 ohms
"R" Needle just lifted - 100 ohms
Not sure what the problem is yet. Just information in case it helps someone in the future
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dstefun
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Joined: February 20, 2002
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Location: Sacratomato
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| Posted: Mon Jan 12, 2009 7:38 pm Post subject: |
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| Did you test on 6V or 12V, with a 6V or 12V gauge? |
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Barnabus
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Joined: April 27, 2004
Posts: 223
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| Posted: Mon Jan 12, 2009 8:26 pm Post subject: |
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12v system.
Unsure of voltage of gauge. It has only just started flaking. been in the bus for at least 2 years. How do I identify the voltage of the gauge??
I dont know if it matters if it is a 6v or a 12v gauge. The gauge uses system voltage as a reference. I am still thinking about that one.
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dstefun
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Joined: February 20, 2002
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Location: Sacratomato
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| Posted: Mon Jan 12, 2009 11:05 pm Post subject: |
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| Barnabus wrote: |
12v system.
Unsure of voltage of gauge. It has only just started flaking. been in the bus for at least 2 years. How do I identify the voltage of the gauge??
I dont know if it matters if it is a 6v or a 12v gauge. The gauge uses system voltage as a reference. I am still thinking about that one. |
The gauge should be marked 6V or 12V, usually with an ink stamp on the back. The date code will also be stamped, and only '67 gauges are 12V.
It will make a little difference because 12V gauges have a slightly higher internal resistance. Something close to an 82 ohm resistor is added internally in a 12V gauge.
There is no difference in the sender for 6V or 12V but the gauge is different by the added resistor. I recommend adding an 80 to 100 ohm 1 watt resistor in series with the power lead externally if you're using a 6 volt gauge on 12 volts. 6 volt gauges will eventually die on 12 volts, but it usually takes them awhile. |
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BarryL
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Joined: November 01, 2004
Posts: 15477
Location: Casa de Oro, California
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| Posted: Sat Nov 19, 2011 10:21 am Post subject: |
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| BarryL wrote: |
| I believe they are 0-180 or 10 -190 ohms. |
This info is totally wrong, if anyone cares. I would love to know exactly. I've now found info that says 0-68 ohms and info that says 0-90 ohms. None of my meters digital or analog will work. Either they are not sensitive enough or what I don't know. I do know that the marine VDO senders can be purchased in 0-90 ohms to be used with their adjustable gauges.
I'd also like to know if the 1967 gas tank that has the hump in it has a longer sender.
One last thing: I can find VDO Brazil senders that are marked 224 005 008 R all day long. Are they the right ones for split window and what is their ohm readings? |
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olliehank47
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Joined: May 04, 2011
Posts: 1198
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| Posted: Sat Nov 19, 2011 6:47 pm Post subject: |
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| BarryL wrote: |
| BarryL wrote: |
| I believe they are 0-180 or 10 -190 ohms. |
This info is totally wrong, if anyone cares. I would love to know exactly. I've now found info that says 0-68 ohms and info that says 0-90 ohms. None of my meters digital or analog will work. Either they are not sensitive enough or what I don't know. I do know that the marine VDO senders can be purchased in 0-90 ohms to be used with their adjustable gauges.
I'd also like to know if the 1967 gas tank that has the hump in it has a longer sender.
One last thing: I can find VDO Brazil senders that are marked 224 005 008 R all day long. Are they the right ones for split window and what is their ohm readings? |
I just replaced the sender in my 67 today, and the resistance figures posted by Barnabus match my unit, though I didn't to as nearly precise a test.
Regarding the 67 tank, the sender fits in the top of the tank at a location that does not have the hump so the length is the same as any other earlier year. |
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BarryL
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Joined: November 01, 2004
Posts: 15477
Location: Casa de Oro, California
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| Posted: Sun Nov 20, 2011 7:31 am Post subject: |
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| olliehank47 wrote: |
| Regarding the 67 tank, the sender fits in the top of the tank at a location that does not have the hump so the length is the same as any other earlier year. |
Boy am I getting the Waldo Award. I found this out today when I pulled the '67 tank out. I took out the sender and compared it to a '65: exactly the same sender. So I look at the hump tank and see the flat. I can't believe how stoooopud I feel. I always thought it was in the top of the hump even while looking right at it.
Thanks for the ohm-ages.
Anyone know if the part number 224 005 008 R is correct? |
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olliehank47
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Joined: May 04, 2011
Posts: 1198
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| Posted: Sun Nov 20, 2011 10:06 am Post subject: |
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| BarryL wrote: |
| olliehank47 wrote: |
| Regarding the 67 tank, the sender fits in the top of the tank at a location that does not have the hump so the length is the same as any other earlier year. |
Boy am I getting the Waldo Award. I found this out today when I pulled the '67 tank out. I took out the sender and compared it to a '65: exactly the same sender. So I look at the hump tank and see the flat. I can't believe how stoooopud I feel. I always thought it was in the top of the hump even while looking right at it.
Thanks for the ohm-ages.
Anyone know if the part number 224 005 008 R is correct? |
Don't beat yourself up over this, it's logical to think the 67 tank would need a longer sender if you had not seen a tank up close  . How would you know unless you asked?
Remember the old saying, "The only stupid question is the one that's not asked." |
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Ryan Pruden
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BarryL
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Joined: November 01, 2004
Posts: 15477
Location: Casa de Oro, California
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| Posted: Thu Dec 01, 2011 11:19 am Post subject: |
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| Just checked my new VDO sender. Nowhere does it say Siemens but does say Brazil on the box. The sender says VDO. The meter shows 4 ohms at the top and 66 ohms at the bottom. |
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tnc19
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Joined: November 13, 2008
Posts: 251
Location: San Diego, CA
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| Posted: Mon Mar 05, 2012 3:27 pm Post subject: |
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| So did we get confirmation on the correct readings for a 6V pre 67 sender? |
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BarryL
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Joined: November 01, 2004
Posts: 15477
Location: Casa de Oro, California
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| Posted: Mon Mar 05, 2012 7:29 pm Post subject: |
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| tnc19 wrote: |
| So did we get confirmation on the correct readings for a 6V pre 67 sender? |
The sender is the same as for '67 12 volt. |
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tnc19
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Joined: November 13, 2008
Posts: 251
Location: San Diego, CA
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| Posted: Tue Mar 06, 2012 11:08 am Post subject: |
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| BarryL wrote: |
| tnc19 wrote: |
| So did we get confirmation on the correct readings for a 6V pre 67 sender? |
The sender is the same as for '67 12 volt. |
was there FINAL agreement on what the reading should be for this sender unit?
or is this still in question?
My bus does not have a fuel gauge, I'm sourcing a gauge and will test the gauge and MY sender (from PO, so I don't know if it was good or not) prior to install...so I want to make sure I have a "good" number to shoot for...? |
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BarryL
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Joined: November 01, 2004
Posts: 15477
Location: Casa de Oro, California
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| Posted: Wed Mar 07, 2012 12:19 pm Post subject: |
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My personal opinion is to ask Dstefun as he's the gotoguru. What I know so far:
This is an original sender used in a 6 volt application. VDO number 21.18, built October, 1964.
Here it is full. The shortest distance across the ni-chrome resistance wire is where the float is at the top of the sender. (this float was bad so that is why the test is at the bottom but ignore that).
Here is the OG sender empty (longest length of ni-chrome resistance wire).
This the Brazilian replacement. This one is not marked Siemens but is marked VDO.
It was built in January, 2011.
Here's the Brazilian sender on full.
Brazilian on empty.
Temperature will affect the readings a little. These were done at 50 degrees.
You might call San Diego Speed-O-Tach as they were a VDO place. Their best guy started his own gig in El Cajon and you can find him by looking under tachometer in the phone book. Also Broadway Auto Electric might help. Their number is 619-461-4380.
I sure hope this helps. |
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Focker
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Joined: February 23, 2009
Posts: 227
Location: PNW
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| Posted: Mon Mar 12, 2012 7:59 am Post subject: |
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| dstefun wrote: |
| There is no difference in the sender for 6V or 12V but the gauge is different by the added resistor. I recommend adding an 80 to 100 ohm 1 watt resistor in series with the power lead externally if you're using a 6 volt gauge on 12 volts. |
Can you explain more of this to me?
When I bought my bus the gas gauge didn't work. I removed the sending unit and found a broken wire. I bought new nichrome wire and repaired the unit. When I slide the float towards the top of the sending unit it reads empty...When slid down it reads full...Backwards (I've just been living with it).
I have a 6 volt fuel gauge that instantly pegs full when turning on the ignition with no ground. If grounded...It pegs back to empty. I want to use the 6 volt gauge because it's stock looking...Are there any pix or diagrams on how to do what you describe? Am I just taking the black dash wire to a resistor then to the gauge? That simple?
Thanx!
My non correct 12 volt gauge that works but reads backwards.
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