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pulled the fuel line to insure this is proper diagnosis?
you say running saturday; has it ever had this problem before?
owned the vehicle since '86? '90? or just purchased?
did you fill up recently? water in lines? fuel/water separator filter bad?
last time glow plugs cleaned and/or serviced?
three items for any internal combustion engine to fire:
air, fuel, spark
those would be the three things to start with.
hope this helps,
ctesla
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