I have a question about my 04.5 truck. At idle there is a hissing noise like an air or vacuum leak. I traced the noise to a black part on the back of the fuel filter canister. This part has a hose coming out of the bottom of it going to the fuel tank. If I kink the line while the engine is idling the hiss noise goes away. Is this normal or should I take the truck in to the dealer? Thanks

 

Anyone?

 

I would be taking it in. This is my third CTD and never had anything like that taking place.

Matt

 

I think you're hearing the lift pump that supplies fuel to the CP3, it's normal.

 

I've had the same noise from the same place since day 1 on my '03. Near as I can tell, it's not an issue? However, if you take it in and they find something, please let me know!!

 

Hhhmm, maybe I need to get my hearing checked! I will see if I can hear this later when I start the truck, paying more attention for it, but it seems odd.

Matt

 

the noise is a electric transfer pump, more like a buzzing noise possibly, no more mechanical lift pumps.

 

gsdog1, did you hear anything on your truck?

 

Nothing like this. Unfortunately I am having an issue with relay chatter when I turn the key to the on position. When I start the truck, I have pinging going on. May be a trip to the dealer to look at injectors for me.

Otherwise, the only thing that I am hearing is the lift pump going through the prestart exercise. That all sounds normal to me, at least based upon what I got used to with my other two CTD's The sound is mechnical, and could be likened to a hissing noise I suppose.

Sorry, not much help I guess...

Matt