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Do I Hear My Fuel Pump While Driving

tomseeley

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tomseeley Enthusiast

tomseeley

Posted
Posted

I know this is the kind of question you truck experts hate. It's from a truck newbie and it concerns a noise! I know you can't describe a noise right, but I'll try anyway.

 

While driving under normal conditions, but most often when the engine hasn't warmed up much yet, I always hear a rotating noise, speed-dependent, coming from the rear of the truck a bit more on the right than left. It's a 2002 GMC Sierra 2500HD duramax. I bought it used in 2005 with 45,000 on it. I tow a travel trailer a lot, and it has 113,000 on it now.

 

The noise has never turned into a problem and I'm not worried; just curious. I don't know squat about how it's put together, so I have no idea at all where the fuel pump is. I wonder if it's inside the fuel tank and that's what I'm hearing.

 

any thoughts?

 

Thx

merlin5577 Senior Enthusiast

merlin5577

Posted
Posted
I know this is the kind of question you truck experts hate. It's from a truck newbie and it concerns a noise! I know you can't describe a noise right, but I'll try anyway.

 

While driving under normal conditions, but most often when the engine hasn't warmed up much yet, I always hear a rotating noise, speed-dependent, coming from the rear of the truck a bit more on the right than left. It's a 2002 GMC Sierra 2500HD duramax. I bought it used in 2005 with 45,000 on it. I tow a travel trailer a lot, and it has 113,000 on it now.

 

The noise has never turned into a problem and I'm not worried; just curious. I don't know squat about how it's put together, so I have no idea at all where the fuel pump is. I wonder if it's inside the fuel tank and that's what I'm hearing.

 

any thoughts?

 

Thx

 

The truck has two pumps, an injection pump (on the engine) and a lift pump to move the fuel from the tank to the injection pump. You should not be able to hear the pumps with the engine running. I believe what you are describing is a wheel bearing going bad.

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted
I know this is the kind of question you truck experts hate. It's from a truck newbie and it concerns a noise! I know you can't describe a noise right, but I'll try anyway.

 

While driving under normal conditions, but most often when the engine hasn't warmed up much yet, I always hear a rotating noise, speed-dependent, coming from the rear of the truck a bit more on the right than left. It's a 2002 GMC Sierra 2500HD duramax. I bought it used in 2005 with 45,000 on it. I tow a travel trailer a lot, and it has 113,000 on it now.

 

The noise has never turned into a problem and I'm not worried; just curious. I don't know squat about how it's put together, so I have no idea at all where the fuel pump is. I wonder if it's inside the fuel tank and that's what I'm hearing.

 

any thoughts?

 

Thx

 

The truck has two pumps, an injection pump (on the engine) and a lift pump to move the fuel from the tank to the injection pump. You should not be able to hear the pumps with the engine running. I believe what you are describing is a wheel bearing going bad.

 

 

+1 on the wheel bearing also but you said it does it when cold, you maybe hearing the allison whine as they do whine when cold but goes away after warming up but if your still hearing it it maybe the pump inside the tranny ready to go out.

BlackSilver Senior Enthusiast

BlackSilver

Posted
Posted

You're hearing your Allison. They quit doing it now, but my first Duramax/Allison came with a video tape which explained several "sounds" which come from those beasts.

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