About a year ago the fuel pump went out on my 88gt vert. It had always been pretty loud. A mechanic replaced it and the replacement was louder than the original! The replacement lasted about 8 months before it died. I replaced it this last time around with a walbro 255lph in tank unit. These walbro units are known for being very very quiet. It still gets pretty loud though, louder than I think it should be... Also, the whine will change pitch if something is drawing on the electrical system. For example if I turn on my turn signal the whine changes pitch with the light blinking on the dash. If I place my foot on the brake pedal to activate the brake lights the whine changes pitch. Same if I turn my headlights on etc...
Anyone shed some light?
If it makes any difference I checked voltage at the regulator and the wires running into the fuel tank, I am getting a healthy 12.xx volts at both locations.
Andy