Engine Performance problem
1998 Chevy S-10 4 cyl Two Wheel Drive Manual 216000 miles
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My pickup will crank but won't start. THe battery was dead for two months. Charged and Reconditioned the battery. Used starting fluid and it fired but would not stay running. Suspect fuel supply problem either fuel pump or filter. How can I check either for proper function? Any hints or suggestions would greatly be appreciated. Thank you!

First change the fuel filter, and then check the fuel pressure. If the fuel pressure is in spec. then it probably is your passlock system (security light). Being that the battery was dead the computer may have to be reflashed.