Engine Codes

Kent's89SC

Registered User
Hey guys, having some problems with some codes. I know what they are, but can't figure out how to locate or fix the problem. First code is 31, which is EVP/PFE circuit below minimum voltage. I can't find info to locate this sensor or how to fix it. socond is code 96, which is Fuel pump secondary circuit/highspeed fuel pump relay open, which boggles me cause my manual doesn't say anything about a secondary circuit or highspeed pump relay. Anyone able to help me out?
 
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