How do you reset the anti theft system

Question edited for clarity and order 'make model 'stuff'.
Question moved to model category.

Presumably, you disconnected the battery when you replaced the fuel pump? Did you reset the anti-theft immobilizer and security system?

https://www.google.com/search?q=1992+ford+ranger+reset+security+system

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probs your key unit.needs a new battery

You can't just change parts an expect it to work , software , modules won't let it work . You have to take it to the dealer or have a mobile lock smith fix it , reprogram it ETC...
Anti-Theft -Passive Anti-Theft System (PATS) The passive anti-theft system (PATS) contains the following components:

• theft indicator
• encoded ignition key
• PATS transceiver module
• powertrain control module (PCM)
• standard corporate protocol (SCP) communication network
• Passive Anti-Theft System (PATS) -Diagnostic Trouble Codes (DTC) Index Powertrain Control Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1213 Anti-Theft Number of Programmed Keys is Below Minimum PCM GO to Pinpoint Test F . B2431 Transponder Program Failure PCM VERIFY if using correct PATS key, if defective USE new key. B1342 ECU is Defective (EEFROM in PCM not working) PCM INSTALL a new PCM. REFER to Section 303-14 . B2103 Antenna Not Connected PCM GO to Pinpoint Test A . B1600 PATS Ignition Key Transponder Signal is Not Received PCM GO to Pinpoint Test B . B1601 PATS Received Incorrect Key-Code From Ignition Key Transponder PCM GO to Pinpoint Test C . B1602 PATS Received Invalid Format of Key-Code From Ignition Key Transponder PCM GO to Pinpoint Test D . B1681 PATS Transceiver Module Signal is Not Received PCM GO to Pinpoint Test E . - All Other DTCs PCM REFER to Section 419-10 .

To reset the anti-theft system, follow these steps:
1. You have a little red light on your dashboard-press it to disarm the alarm
2. Try turning the key and moving the shift from park to drive and back, then try starting it again
3. Disconnect the battery and let it breathe for 20 minutes and more, and reconnect it, that may do the trick
4. If all else fails, you may need to go down to the dealership to reprogram the key

Bobby, Ford Taurus anti theft system reset procedure. reset button below driver side dash. Check the attached links,instruction and guides, Good luck
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How do you reset securiLock anti theft system on 2003 Ford Taurus
How do disarm anti theft device on 2001 ford taurus
https://answers.yahoo.com/question/index?qid=20081101221926AAKSS8V

Unhook the battery for a couple of days and give the computer time to reset itself.

A factory anti-theft system does not have a reset button.

Have you tried a different key?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

passive anti theft wont let me start my 1999 ranger ? how do Ifix it