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93 escort wagon. Drives great in cooler weather, when it gets hot after a while car will die out then restart and go again, Has been doing this a long time, starting to get worse.
Ran the codes get a 542.
I checked fuel pressure as i was driving was good even with chech engine light on
 

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Fuel pump secondary circuit failure.

Ripped off from another website:
1. A service code 542 means a fuel pump secondary circuit failure....secondary circuit means the on/off circuit in the relay that supplies the 12-vdc voltage to the pump and is monitored by the Fuel Pump Monitor (FPM) pin or signal at the ECM.

2. Access ECM connector and check for 12-vdc at appropriate ECM pin, engine running….reading should be 12-vdc….Yes…replace ECM…NO…trace open wire to FP relay output to fuel pump and repair as required.

3. Clear codes, perform a 5-10 minutes drive cycle, and recheck the system for codes. If codes repeat, an intermittent wiring problem is present or the ECM is faulty.
 
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