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Hello, did you find any metal shavings when you drained the oil?
Did you check the pickup tube was not clogged up?
I dont think internal leak is the case. It could be a faulty timing chain tensioner too. did you check that ?
Do you hear any slack or chatter form the timing chain area?
Other than the fuel pressure guage what other symptoms are you having of low fuel pressure?
I'm sorry. I meant oil pressure. Are you sure your guage is accurate?
It is worth a try. Since it is not showing any traditional symptoms of a low oil pressure issue.
Ok. And if pressure is same than proceed with the timing chain tensioner check.
It calls for around 6 hrs by the book.
Ok, keep me posted.