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If your pump is out you should not run the engine as this will ruin it very quickly. If you have an oil pressure guage and you have less than 10 psi of oil pressure you have a problem.

My 94 Chevy G20 van with a 5.7L had low oil pressure until I replaced the intake manifold gaskets, during which I cleaned the "gunk" between the cylinder banks. I also replaced the oil pressure sensor sensor which I broke while removing the manifold (oops). Now the engine has good oil pressure at all rpm's. Not sure which was the issue.

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16y ago

What else can I help you with?