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Fix the problem first before you go do a lot of changing. IMHO you are just adding more equations to the problem by changing everything when you do NOT even know what is wrong and causing the issue. Save a lot a time and money. The fuel filter base may be the issue. But it may NOT be the issue...

I service it. Remove it and replace it. Then it has been serviced. I have snapped cover bolts off a few also rendering them in-serviceable. I meant serviced as getting it rebuilt at a competent service center. Have a great day.

A word of caution. The 10/24 screws into the pump cover are steel. the pump is aluminum. What happens when steel screws are in an aluminum housing? 10/24 screws at that. Unusable core. I will say no more. Proceed with caution.

I use Diesel Care Products out of Memphis. I hear a lot of crap about them and everyone else. No one seems to have anything good to say about anyone anymore. I never had an issue. I did have issues with brand new pumps that I bought as NOS. So give them a call. If you search under 6.2 diesel...

My guess is if you never serviced the injection pump. It has called you out and needs rebuilt. Not a bad job about + - $400. and about 4 hours work. Good Luck. I change mine before they let me sitting. Mileage has nothing to do with pump. It is still over 30 years old and living on borrowed...