How much does it cost to change an oil pump in 93 Chevy suburban?

deopends if you can do it yourself, you can buy one online for 50$ and put it in yourself, but be forewarned when you drop your gas tank you may have to replace the straps holding it up because they will probably be rusted so badly they break, although you can take this as an opportunity to drain out your gas tank, which is recommended by the manufacturer to do every year. but if you have it done professionally it can get quite costly, my friend had to pay 800$ for the pump to be replaced on his 1998 silverado