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I have a GMC 2500 sle hd with a 46 gallon Transfer Flow fuel…

I have a GMC 2500...
I have a GMC 2500 sle hd with a 46 gallon Transfer Flow fuel tank. I has made a sound after the truck is stopped and turned off (bong) for quite a while. I didnt pay much attention to it befcause a lot of the time I was out of the truck by then. Now lately, it bongs about every 1/2 mile or mile driving slowly aroung town. some times now after it is turned off I hear it two or three times. The truck has two fuel filters in the line. One
GMC and one Transfer Flow. the truck operates normally and I don't have any problem with the operation or motor.
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Answered in 11 hours by:
4/15/2012
Walt-Mod
Walt-Mod, Moderator
Category: GMC
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Hi,

I'm a moderator for this topic and I wonder whether you're still waiting for an answer. If you are, please let me know and I will do my best to find an Professional to assist you right away. If not, feel free to let me know and I will cancel this question for you. Thank you!

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Customer reply replied 6 years ago

I'm still waiting for an answer. I got an email about needing more information. And I was directed here. Happy to supply any information that you need.

Sometimes, finding the right Professional can take a little longer than expected and we thank you greatly for your understanding. We'll be in touch again shortly.
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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 30,421
Experience: GM Grand Master Technician 2007. 14 year experience.
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Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
Are you sure it is not the heat shields on the exhaust heating up and cooling down?
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Customer reply replied 6 years ago
the vehicle doesnt have to be warmed up for it to do it. I don't think so. and my mechanic says my exhaust system is okay. Although I would not rule out anything. Are there any issues with fuel pumps or pressure relief valves that you know of. Fyi, I cannot hear any noise from the fuel pump like hissing or hear it running like I've read about on other gmc issues.
They are common for fuel pump issues, but the type if noise is not one I have heard along with a fuel pump.
Can you check the heat shields and see if they are loose?
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Customer reply replied 6 years ago
No, I'm too old to climb under there. But I can make sure to tell the mechanic when I go back in. It is a hard problem to trace.
It is.
Let me know what you find, save the link as a favorite to make it easy to get back to me.
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 30,421
Experience: GM Grand Master Technician 2007. 14 year experience.
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Gm Tech (Cam) and 87 other GMC Specialists are ready to help you
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Customer reply replied 6 years ago

Okay, The guy at Transfer Flow had not heard of any problems with his product.

Give me a few days.

John

Customer reply replied 6 years ago
Cam, I got so neighbor help. Heat shields on manifold are tight and cover over muffler is also tight.
I worry then that the noise is a small fuel explosion since nothing else makes sense.
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