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Hi fellas! I've done oil pumps on a lot of cars over the years, but this is the first time that I feel the need to replace it in my 2002 4.3 Silverado, and I just don't know where is it.
By the way, and before I get to it. I would like a few opinions from you guys with the experience or should I say expertise?
The engine makes a clunking noise like oil starvation usually in the morning or after the truck is been sitting for a few hours. I just noticed that tha oil pressure gage moves very slowly up while the noise is there and it takes a good 3 to 5 minutes to reach the max which is two lines over the 40 mark. Am I right to suspect the oil pump??? Or should I look for another offender?
 

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As most chevy engine , the oil pump is in the oil pan, like unplugged said!! Before you condemn the oil pump: How many miles on your truck?? What kind of oil are you using and how fresh is it?? What part of the world do you live in, how cold is it in your neighborhood??
Try changing your oil and filter with a thinner viscosity oil, and see if it helps. And if it is indeed your pump, Stay away from high pressure pumps, since they can wash out your bearings. I do recommend a high volume replacement, though!!
Doing and oil pump while the engine is still in the car is an absolute pain, I would make certain the problem is in fact the pump before doing it!!
Hope this helps!!

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