Ali SC3

iTrader: (10)

lol, ive noticed the exact same thing.
Also for those who have an after market sub woofer when my amp turns on/off , I can hear the pump noise change tones.
In fact random electronics can make the noise change also like when I use my power inverter to charge my laptop while tuning.
the more gas in the tank the quieter it is for me.

stockhatch

iTrader: (12)

I notice that too. I can detect a small pitch change even when the signal light relay is oscillating. I need to fill up today so I will see if a full tank makes it quieter.

turbodremz

iTrader: (18)

a full tank will drop the noise level, but very slightly. I dont hear any change in the pump when using other electronics, but the walbro is very annoying after time.

stockhatch

iTrader: (12)

Yeah, I suspect better, or more dedicated grounds might fix the interference noises.

turbodremz

iTrader: (18)

And I think that may be why I dont hear any change. I have several dedicated grounds through my entire SC, but have 6 under my hood not including the stock ground location, and 3 or 4 in my trunk where the battery sits, but that also doesnt include inside the cabin.

Ali SC3

iTrader: (10)

Holy grounds Batman!!