Why when I use my turn signal or brake can I hear it in my fuel pump?

 

do you have the radio on???

 

You mean when u use any sort of power....headlights turn on...brake....radio...blinkers...the pitch of your fule pump hum changes?

 

Yes and yes it has been that way since I bought the car and I want to fix it. What's up?

 

of course when you introduce a load into the system the fuel pump noise will change = normal, now if you here noise through the radio speaers such as a buzz or whine, change the plug wires to a radio supression core style

 

mine does it too. Always though its because my alternator sucks. lol.

 

Your turn signals shouldn't be drawing too much power. I would check the ohms from the ground side of the fuel pump wire to a good body ground. same with the power to the positive side of the battery.

 

take your underdrive pullies off and put the stock pullies back on and the minor voltage fluctations that the turn signal makes will be made much much smaller.

 

Thanks,I thouht I had a problem but it is normal. I don't know if I have underdrive pullies.

 

my old fox was like that but i had gutted the hatch so all i could hear is the pump whine.