There is a hum that is coming from the gas tank of my 92 Prelude.

It hums when I turn the car off. It's not the fuel pump. I disconnected the power wire to the pump motor and it still did it.

It hums for a little while then turns off then back on for a second then off.

It doesn't seem to drain the battery.


I guess it has to be the sending unit.

Is this semi normal?

 

it's definitely probably the pump or sending unit every time you turn the key into the "on" position it primes to fire the engine. Only other thing i could think of is the automatic antenna. goes up and down when the key is turned on if the radio was on.

 

^^ this

 

Antenna is disconnected and the pump runs of a separate relay, not the stocker.

I am thinking sending unit, but seems odd - Kinda.

 

i know my fifth gen has kinda a short squeak or squeal when i turn the key to on, which i am sure is the fuelpump turning on, antenna is a possibility

 

Evap system? IDK someone else may know more about this.

 

as in no antenna or you have the wiring disconnected? it sounds like the antenna motor.