Re: 49 tank sending unit

Posted by HH56 On 2017/5/19 20:29:39

I would like to hook up a sender and gauge and measure the interval of the on/off cycle at varying float levels just to see what it actually is doing. If the cycle was found to be relatively consistent or predictable then it might be possible to make an IC timer module that would switch a small relay on and off. Use a common aftermarket rheostat type sender to vary the timer.

I have a sender and just found a cheap gauge with a damaged needle on ebay. If it isn't burned out will see what I can find out about the operation.

It would be interesting to see if a timer could be configured to more or less duplicate the bimetal sender without introducing an error. I agree with Fred that it seems unlikely the constant resistance sender will be entirely compatible. I know Tinman_70 has had his replacement working and reading correctly in short spurts but last time he mentioned it he had not left it on an entire day to see if the gauge would be stable over time. Without being able to have the brief cooling period the off cycle of the bimetal permits I suspect the gauge will gradually read higher than it should. Would be nice to prove that one way or the other.