Re: [DeTomaso] Tank gauge

["prolan1" <prolan1@pacbell.net>]

autometer makes the following:



part number = 2-1/16" 2-5/8"  Fuel Level (0 ohm empty/ 90 ohm full)
      For most GM vehicles from 1965 to present.
      3314 3514



Crash Test Dumba$$
prolan1@pacbell.net
www.jacobsracing.com/dd
----- Original Message -----
From: "Thomas Tornblom" <Thomas.Tornblom@Hax.SE>
To: <detomaso@realbig.com>; <detomaso@detomaso.nu>
Sent: Thursday, April 10, 2003 12:56 PM
Subject: [DeTomaso] Tank gauge


> 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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> DeTomaso@realbig.com
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