EGR VALVE...92 blazer

I've been given some advice to check/clean my EGR valve. I've done this before on other trucks but i can't seem to locate this one. Need help.
92 chever blazer 6cyl. 4.3 "W"

thanks Brian
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behind the alternator
might have an electrical plug

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Ok found it checked/cleaned it
one more question. I hear a hissing noise coming from the fuel pump/tank area above rear wheel
Is that normal?

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