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While testing for a problem in a 1970 Dart swinger fuel sending unit which is not working you are receiving a pulsing voltage signal at the wire lead connection to the fuel sending unit is this Normal?
Wiki User
∙ 14y ago
Yes it is. The term "sending unit" is misleading since it actually doesn't send anything. It's a receiver of sorts and provides a "variable ground" for the gauge in the dash to put it simply. There is a rheostat in the sender that effectively changes the voltage allowed to pass through the sending unit to ground as the float moves up and down with fuel level in the tank.
The pulsations are caused by the voltage limiter in the dash that limits the voltage powering up your gauges ( and in turn going to your senfing unit. This limiter acts in a fashion like your flashes. It pulsates the current (turning it off and on) at a rate that never allowing the voltage to go over a cretain limit. This pulsation also SOME WHAT allows the gauge to hold a steadier reading as the fuel sloshes around in the tank causing the float to rise and fall rapidly. Consider it an electrical trick to average the fuel level over a length of time. I doubt though that the factory engineers designed it with this in mind.
Wiki User
∙ 14y ago
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