1998 Chevrolet Suburban 2500 Q&A

1998 Chevrolet Suburban 2500 Question: i have a 6.5 diesel vin f engine it keeps shutting down i have replaced the pmd

i have replaced the pmd 3 times still shuts down could it be the lift pump? i also know it could be the oil sending sending unit. -
Answer 1
do fuel pressure test cold and while driving -
Comment 1
what should the fuel pressure be? could this be a bad lift pump? thanks for getting back to me i have been fighting this for weeks. -
Comment 2
approx 5 lbs all the time -