Re: Humming Noise

Posted by HH56 On 2013/2/11 16:43:24

Not knowing your setup it's hard to say whether the sound is normal or not. Most electric pumps are "pulsers" which have a throbbing or clicking noise when working. Humming might mean a rotary type. Whether you would get rid of the noise completely with a new pump is unknown.

Many have added that pulser type electric pump near the gas tank to push fluid to and thru the regular pump. The electric is controlled by a switch so it's only on for a few seconds to prime the carb when the car has sat for long periods. Once the car has started, the electric is turned off and the regular pump takes over pulling gas thru the electric and all works as normal -- and quietly. NOTE: The pulsing type will usually allow gas to pass thru if off but the rotary type generally does not without extra plumbing.

One other nice thing with that arrangement is if the car acts like it is getting vapor lock with todays more volatile fuels, it could be turned on and with the fuel being pushed under pressure usually alleviates the vapor lock symptom.

If I were going to do something I would get the proper mechanical pump operational and do the electric as described as a backup. Your car also depends on a working mechanical pump for the secondary or vacuum section. That part provides supplemental vacuum for the wipers when the engine is under load and can't provide much.