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gas gauge problem
I need your expertise. I have a 1994 Classic Motor Carriages Cobra. It has "Vintage Reproduction" gauges in it. The gas gauge quit working, so I changed it to a Stewart Warner Ford type and now it reads full regardless of the fuel level. When I refer to the assembly manual, it says, " The gas gauge and sender are a matched set." Problem is it does not say what kind it is..... Does anyone know what kind of sender they used in these cars? Or maybe someone can help me troubleshoot the problem. Should have mentioned earlier that the other gauge showed 1/8 tank all the time.
Thanks in advance for any assistance you can give me. Rob Burton |
The Stewart Warner uses a pre-70 chevy sender. You need to figure out who makes the gauge you have. Could be one of the big 3. SW VDO or Autometer.
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They are white-faced gauges with black markings that say "Vintage Reproduction" on them in a script-type writing.
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I belive the SW uses a 270 Ohm guage if you can put a Ohm tester on the sending unit and find what you have and go from there.
Ken |
i'm assuming the ohms measurement changes with the level of fuel, so should I take the ohms reading with the tank full?
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You need to remove the sender from the tank and wire it directly to your gauge, so you can lift the float by hand to see if the gauge reads full and lower it to see if it reads empty. if it does nothing, then hook up an ohm meter to the sender to check it's range( if any), it could be a bad sender.
Tim |
I have approximately 1/2 tank now, so I will read the ohms from the sender, then fill it up and read it again......just wish i knew which type of gauge my original one was.... I still have it. Is there any identifying markings on the back of it that might give me a clue?
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Do you have access to a ohm meter?
Ken |
yes
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Rob What I would do is hook the ohm meter (digital works best) to the sending unit move it threw the cycle see what kind of reading you get I belive the SW guage read ohm between 33-240 or 270 the senders should be pre 89 fords run 73-12 ohm 87 up fords are 10-180 ohm. Most inportant is the ground hook it to the tank unit it self (tank unit should have a gasket under and will not get the correct reading) I don't know about the SW guages but on the GM no ground or dead ground that does to the read side of the guage will cause a full reading.
Hope it been a little help. Ken |
When I turn the key off, the gauge falls back to approximately 1/2 tank, but when I turn the key on, the gauge goes immediately to full. I will read the ohms with a digital ohm meter and let you know what the reading is.
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Hey Rob, I'll give you a good deal on a Smiths (made with original tooling) fuel level gauge that shows 1/4 full when it *is* full and 5/8 full when it is empty. Consistently. I presume I have a sender problem, but I'll find out when I get my new ATL fuel cell with a new sender. I've never owned a British car before, but with my genuine Smiths gauges and Lucas (Prince of Darkness) electrical system, not to mention my XKE suspension, I am getting a feel for the glamour of putzing around regularly, trying to keep this thing running. Rich
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