Fuel Level Sending Unit Buffer

Looking for a circuit schematic, kit or turnkey device that buffers the signal from the fuel level sending unit before it reaches the fuel level gauge.

Just installed a new fuel level sending unit in my Intermeccanica Speedster. The indicator needle now bounces all over the gauge as gas sloshes around the tank, driving the sending unit float up and down as I drive. A buffer that would 1) sample, then hold the voltage level for a minute or so, or, ideally; 2) average sampled voltages over time, then send the average voltage to the fuel level gauge, would solve this problem. Thanks!

I think Volkswagen used a device known as a vibrator to average out the meter reading....I'm not sure if it would work with your guage, as it was a "factory" part.....Maybe someone knows if it's compatable...Angela, you're on call as Larry's out of town....

Nope...vibrator doesn't work...only is good with the stock VW gauge.
I have stock 914 VDO gauges and the only thing I found that worked for me was a tube type this:

http://www2.cip1.com/ProductDetails.asp?ProductCode=VWC-311-919-051

The fuel level in the tube isn't affected by the sloshing fuel in the tank which helps keep needle wagging to a minimum.
These are a bit pricy nowadays, but if you shop the samba or ebay they usually pop up cheaper.

Also use the search function on the main forum index...you'll find a lot of info on fuel senders.

~WB

This one is for a Type 3. I think a Karmann Ghia sender is also a tube type, at least for some years.

Guys, thank you for your help, I'll try a tube fuel sender.

Now that I know how to SEARCH...http://www.isspro.com, referenced in another thread, offers tube fuel senders of varying lengths. My tank is advertised as US 15 gallons, though it may be closer to US 13.5 gallons, as that's how much gas it took when I recently coasted into a gas station with an empty tank. I'll measure from the top of the tank to the bottom - at the fuel sender hole - then order the appropriate length tube fuel sender. Isspro senders are calibrated to range 33 - 240 Ohms, which I hope matches the resistance calibration on my Brazilian VDO gas gauge.

My mistake, resistance, not voltage, varies with the fuel sending unit arm position, something I knew 30 years ago, but seem to have forgotten, time to review some basic electrical theory and exercise my brain :-)