Gurgling sound coming from the rear of the vehicle?

JR47

MEMBER
2005 PONTIAC GRAND PRIX
3.8L
V6
2WD
AUTOMATIC
203,965 MILES

I test drove this vehicle earlier today and there's a noticeable gurgling sound coming from the rear of the vehicle. It's more noticeable if you're standing next to the rear or if you open the trunk. I want to get another opinion on what this could be and if it's easily fixable.

Friday, May 26th, 2023 AT 9:31 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,114 POSTS

Hi,

Does it only do this when the engine is running? I ask because the only thing back in that area that would make a gurgling sound would be the fuel pump. There is a chance the pump is failing.

When you drove the vehicle, did it run and accelerate normally? Is the check engine light staying on when the engine is running?

Let me know.

Joe

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Saturday, May 27th, 2023 AT 12:16 AM

JR47

MEMBER
102 POSTS

There's no check engine light and yes only while the car was running. It accelerated normally but I did also notice and slight sputter when letting off the accelerator at idle and while driving.

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Saturday, May 27th, 2023 AT 2:59 AM

JACOBANDNICKOLAS

MECHANIC
110,114 POSTS

It is very possible the fuel pump may be failing. What I would recommend is to check the fuel pressure to confirm it is within the manufacturer's pressure specifications.

Here is a link that explains how to check the pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

You will need a fuel pressure gauge, but most parts stores will lend one to you. Also, I attached the fuel pressure specs below.

Try this and let me know what you find.

Take care,

Joe

See pic below.

Image (Click to make bigger)