Stancor GPR installed
Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
I just noticed mine doing that yesterday.
It sounds just like you described and it seems to quit like its on a timer?
Its got a wire to it and some hoses sticking out of it.
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Posting Guru
Joined: Jul 2004
Posts: 1,686
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From: East Tn
Does the air pump gome on every time the key is on? I have voltage on the large terminal accross from the 12+constand for around 20 sec after startup and the other 3 have voltage while the engine is running. That is how it's suppost to be right???
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
That sounds right. The vacuum pump will come on and make a noise similar to what you're describing. It's on the passenger side fender and looks kind of like it might be an air filter or some type of container. Pop the hood before you start the truck next time, then check to see what's making the noise when you turn the key on. If it's the GPR you should be able to feel a vibration, if it's the vacuum pump, you can tell by leaning down close to it and listening.
Posting Guru
Joined: May 2006
Posts: 2,274
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From: Milroy, PA
To see if the GPR is being turned on, you need to put one probe of the meter on one of the little terminals, and the other probe on the other little terminal. When engergized, that should read around 12 volts. The air pump would come on every time you have the ignition on it you have a leak, or untill it makes enough vacuum to shut off. If you can, turn the key on, go under the hood, and see were the noise is coming from. If it is the vacuum pump, like said above, its on the passenger side, behind the battery.
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Posting Guru
Joined: Jul 2004
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From: East Tn
It the air pump under a piece of insulation on the passenger side fender? That is where the buzz is comming from. I could clearly hear the gpr click.
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Joined: May 2006
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From: Milroy, PA
Yeap, Chris and Blaine are right. Only one of our trucks has that flap of insulation, and thats were its hiding. Do you have a floor shifter tcase? Or push button. If the vacuum pump is continuously running, Id dare to bet you only have the defrost option. Not the floor, or vents. Which would mean you have a leak on the vacuum side of things.
Lead Driver
Joined: Jan 2007
Posts: 6,708
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From: Kiowa CO
Yes, you are hearing your vacuum pump.
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Posting Guru
Joined: Jul 2004
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From: East Tn
Yeap, Chris and Blaine are right. Only one of our trucks has that flap of insulation, and thats were its hiding. Do you have a floor shifter tcase? Or push button. If the vacuum pump is continuously running, Id dare to bet you only have the defrost option. Not the floor, or vents. Which would mean you have a leak on the vacuum side of things.
