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

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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.
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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.
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