2002 GMC Sierra fuel pump

JIMMOONANDSUE2

MEMBER
2002 GMC SIERRA
V8
4WD
AUTOMATIC
110,000 MILES

It sounds as though the electric fuel pump is running continiously. Its a very high pitched whine or whistle type noise. I feel sure it is comming from the fuel pump. But, why would the pump run continiously? I have owned this truck for 4 years and it has always done this but it seems to be getting louder.

Thanks You,
Susan

3 Replies

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Hi Susan,

Were does it sound like it is coming from, the front of the vehicle or the rear.

Also when you say that the Fuel Pump runs continuously, do you mean when the vehicle is running or whether the vehicle is running or not. When the vehicle is running the Fuel Pump should run continuously.

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Monday, October 12th, 2009 AT 6:37 PM

JIMMOONANDSUE2

MEMBER
2 POSTS

It makes the sound when the truck is running. The sound comes from the side of the truck where the gas cap is. There is a loud hissing sound if a stand by the passenger rear fender well. Back pressure from the fuel line?

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Friday, October 16th, 2009 AT 2:25 PM

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Hi, Sorry for delay in getting back to you.

A hissing sound is usually and indication of a Vacuum Leak or possibly and Exhaust Leak.

The fuel return shouldn't have enough pressure to cause any noise.

Does it sound louder when you remove the gas cap?

If so it is most likely the fuel pump.

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Sunday, October 18th, 2009 AT 2:15 PM