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edpdx, has the truck been smoking blue, white, or black smoke?

Fuel pump push rods do fail. I have seen one 6.2 diesel broken in 37 years, not likely but possible. But the cam eccentric can be worn down also to the point of no lever action. And the end of the rod can be scrubbed, but also a rare occurrence. That is another great reason to start all...

5 Micron filters are good but 1 micron sure does help cut down on injection pump issues. My 82' civi has a 5 and 1 micron factory filters. The 5 has a water separator on bottom of filter and drain petcock. Every now and then I will check fuel in jar for water. Buying fuel at a good fuel station...

Any and all "rubber" hoses are suspect. Collapsed hose is also possible. Any air in the gage and gage will not read correctly, at all. That spot is for air to bleed. When changing fuel filters, inspection of filter by pouring contents in to clear glass jar, do not close any glass vessel with...