99 le sabre hot no start

[rachet16]

Went to dealer this morning no open campaigns. Could not verify if fpr had been replaced. Went to the parts store replaced fuel pump relay still low pressure same as before 15psi koeo 26 psi running no change when I remove vac line to fpr. Replaced fpr pressure still the same still no change when vac line to fpr is removed. Didn't do the voltage / light check , it's raining today and I'm working in the driveway.
Really looks like the fuel pump is going but I'm not convinced thats causing the no start. I'll check fuel pressure the next time it won't start. The car is my wifes work car so its not here all the time. It always starts cold the problem only shows up after driving 20 minutes or so then sitting for 15-20 minutes. Wait 2 hours and it will start again.

[rachet16]

Drove the car approx. 25 miles this morning shut it off and restarted twice. I let the car sit 20 min.and tried to start it fired chugged coughed a couple times and stalled . I checked fuel pressure and it was still the same 15 psi koeo relieved fuel pressure checked again koeo still 15 psi relieved pressure again and restarted it ran rough for a couple minutes and smothed out. Then it would restart??????

[rachet16]

Does anyone know what is acceptable fuel pressure bleed down rate for this vehicle??? Mine went down
5psi in 30 minutes 11 psi in 1 hour. Could a leaky injector/ injectors be causing the no start after sitting 20 minutes????

[Blue Bowtie]

Pressure drop is less of a concern than running rail pressure. 37-44 PSIG is the standard.