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The Pub For General Automotive Related Talk |
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20-06-2011, 06:10 PM | #1 | ||
Boss 335
Join Date: Jan 2006
Posts: 4,330
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Hi, is there a device that can convert the output of a 0-250 ohm fuel sender to 0-1000 ohm range?
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20-06-2011, 08:48 PM | #2 | ||
Chairman & Administrator
Join Date: Dec 2004
Location: 1975
Posts: 107,465
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Hrmmm - it's more normal (and much easier) to step down. I'd be rather more inclined to add a resistor at the gauge end to step down the input. The Stewart Warner (the one I presume you have) style senders are typically 33-240 ohm (F to E respectively) whereas the Ford senders work in the opposite direction.
If your gauge is expecting 0-1000 (unlikely but anyway) then you need to reduce the gauge input by a calculated factor - assuming it is linear which most are. You need to know the exact operating range (the gap between the empty and full actual reading) so that you can calculate the resistance required using this formula: 1/R1 + 1/R2 = 1/Rtotal So, for example, if your 0-250 ohm sender is really a 33-240 SW style one then it has a 208 ohm operating range. You need to establish the same mathematical calc for your 0-1000 and then apply the formula above. I'll work an example for you. Let's say (for arguments sake) that the 0-1000 is really 40-840 ohm then the range is 800 ohm.Thus you need the 208 ohm range to read across 800 ohm instead (actually the reverse really). Thus 1/800 + 1/x = 1/208 Therefore x = 1/280 Thus you could use a 280 ohm resistor in the gauge winding to obtain a fairly accurate reading. NOTE: This assumes a linear operation of the sender. Cheers Russ
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Observatio Facta Rotae
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20-06-2011, 10:49 PM | #3 | ||
Boss 335
Join Date: Jan 2006
Posts: 4,330
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Thanks Russ. But I think this is in the realm of an electrical engineer. I'm no good with numbers and formulas. The Car I am working on is a BA falcon fitted out with FG running gear and electronics. The FG uses a fuel sender that reads from 0 to 1000 ohm, while ba is 0 to 250. How would I install a '280 ohm resistor in the gauge winding' of an FG?
I think I have a solution, I will attach the FG fuel sender potentiometer to the BA fuel sender floater, and work with that. |
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20-06-2011, 11:15 PM | #4 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Perth
Posts: 1,794
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Yep, use the fg sender.
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Current Rides: 2017 Ford Mustang 2020 Ford Everest Sport Past Rides: 2017 Kia Stinger GT 2008 FG XR6 Sedan 2008 FG G6E Sedan 2004 BA XR8 Sedan 2008 BF XR6 Turbo Sedan 2004 BA XR8 Sedan 2003 BA XR8 Ute 2003 BA XR6 Sedan |
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13-01-2014, 09:24 AM | #5 | ||
Regular Member
Join Date: Jul 2010
Posts: 83
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goto ebay and look up fuel wizzard,....
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06-11-2020, 11:33 PM | #6 | ||
Starter Motor
Join Date: Feb 2020
Posts: 5
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Hi All I'm new to this site and computers ,does anybody know the OHM resistance value for a 1968 XT Falcon/Fairmont fuel sender ? any information would be helpful Thanks .
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07-11-2020, 12:05 AM | #7 | ||
FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,571
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These are handy https://www.jaycar.com.au/resistance-wheel/p/RR0700 and https://www.youtube.com/watch?v=n3joyToqpCc to test what resistance gives the correct readings at the dash. Test on a full and empty tank and once you have worked out what resistance gives the correct reading permanently replace it with a soldered in resistor of the value that worked correctly.
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regards Blue Last edited by aussiblue; 07-11-2020 at 12:12 AM. |
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07-11-2020, 12:35 AM | #8 | |||
Thailand Specials
Join Date: Aug 2009
Location: Centrefold Lounge
Posts: 49,694
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Quote:
http://www.vdo.net.au/media/189570/2...-catalogue.pdf Bottom of page 8/96 on the PDF, physical page number 6. Not sure how accurate that is as the VDO catalogue is chock full of mistakes, but in my experience most stuff ex USA specs is 240 - 33 ohms but it seems this 73 - 10 sender does a lot of local cars. Also while this thread is old as the hills to answer the OP's question, page 85/96 or physical page number 83 is the resistance conversion box thing that can do what he's asking for. |
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07-11-2020, 01:09 AM | #9 | ||||
FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,571
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Quote:
Quote:
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regards Blue |
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07-11-2020, 01:25 AM | #10 | ||
Thailand Specials
Join Date: Aug 2009
Location: Centrefold Lounge
Posts: 49,694
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07-11-2020, 03:17 AM | #11 | ||
FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,571
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Sorry I thought you meant this that is also on page 84 of that PDF catalogue.
https://www.ebay.com.au/itm/VDO-GAUG...-/323105667363
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regards Blue |
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07-11-2020, 09:13 AM | #12 | ||
Starter Motor
Join Date: Feb 2020
Posts: 5
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Thanks for that information I will have a look at the PDF and go from there .
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07-11-2020, 05:16 PM | #13 | ||
FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,571
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I just remembered I also have this that I haven't used for decades (well at least many years before I passed the EH Holden Panel Van that I inherited from my grandfather via my father) onto my nephew. It is in a Litchfield Tool Labelled Cardboard Box but Googling it today by the tag on the Box suggests https://i.ebayimg.com/images/g/ndQAA...ttA/s-l400.jpg it is an OTC tool sold by John Deere but perhaps like John Deere Litchfield also sold it. The plastic Case has a "Serviceguard" Label on the front and what looks like a thermal printed label "JT01633". Very similar to the VDO tester. It could also be used to work out what the value of and additional resister connected in series would need to be to make a gauge work correctly. I know it is going a bit off topic but I thought I would post as it might be helpful for anyone with similar issues to the original OP.
BTW I had to add an inline resistor to the temperature sender in my NB Fairlane as being a prototype with a unique prototye dash cluster and temp sender, I could not get a replacements sender that would work with the gauge so it was a matter of playing with a laser thermometer and my resistance wheel to get it all working; I could have perhaps also have similarly used the Serviceguard calibrator if I had thought of it.
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regards Blue Last edited by aussiblue; 07-11-2020 at 05:39 PM. |
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