Re: [DeTomaso] Tank gauge

[John Bentley <jab@cisco.com>]

great data Thomas, thanks.

JB



At 09:56 PM 4/10/2003 +0200, Thomas Tornblom wrote:
>In my quest to get properly working instruments, I have spent a few hours
>measuring the tank sender resistance and noticing the gauge reading for 
>various
>amounts of fuel.
>
>As I still have the car on jackstands, it was quite easy to drain the tank so
>that I knew the exact amount of fuel for each measurement.
>
>I added 5 liters at a time, noticing the gauge reading and resistance.
>
>Here's what I found:
>
>liters  R (ohm) gauge
>---------------------
>empty   ~2k     empty--
>5       321     empty-
>10      272     empty+          lamp goes out
>15      234     1/16
>20      208     1/8+
>25      180     1/4-
>30      160     1/4+
>35      135     3/8
>40      115     1/2-
>45      100     1/2+
>50      88      9/16-
>55      75      3/4-
>60      60      3/4
>65      48      3/4+
>70      27      4/4-
>75        3     4/4+
>80        2.5   4/4+
>
>When I filled the last few deciliters up to 80 liters, the fuel level 
>climbed up
>into the filler tube, but sank slowly as if something was leaking. I 
>believe the
>excess fuel drained into the carbon canister. I have a late aluminum tank 
>by the
>way.
>
>All gauge readings were taken with the ignition on, a battery charger 
>active, no
>lights on.
>
>For those (like me) contemplating replacing the instruments with better 
>working
>VDO:s, VDO North America has a fuel gauge in all common series that probably
>would work fine. They have a gauge with 240 ohm (empty) - 33 ohm (full), and
>adding a ~30 ohm resistor in series with the sender would probably work
>reasonably well.
>
>This type of gauge is not available from VDO Germany. The German gauges are
>either 3 ohms empty and 180 ohms full (opposite from veglia) or 60-90
>(adjustable) empty and 0.5 ohms full.
>
>I will get one of the 240-33 gauges from Summit and try it out with the stock
>sender.
>
>Cheers,
>Thomas
>
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John Bentley
Wireless Systems
Cisco Systems, Inc.
408.525.9336