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Hello David - With that crud showing up, change those filters! Also check the sediment bowl and the screen on the top of the bowl. You may also have some crud in the fuel tank itself. It would be wise to check that, and clean it out as well. Dirt and water are a real no-no, particularly in the diesel fuel systems. With gas, it just means cleaning the carb - with a diesel, if it gets through to the pump, it gets horribly expensive..... Water cost me a new injector pump - over $1000 in 1985.... There is one more screen - on top of the sediment bowl casting, up inside the tank. It sometimes goes missing or gets plugged. To check, turn the valve on with the glass bowl off - fuel should run through freely.
This means the screen is either clean or missing. If the tank is clean, I would not worry about replacing it if it is missing. If there is crud in the tank, I'd replace it. Probably means a new sediment bowl complete. The filter cans come off like the oil filter. The short can is the primary filter, and comes off with the top center nut or fitting removed. I think there is a fuel line fitting attached to that, but can't check it - I sold my 4 cyl a couple of years ago, and the parts book is not clear. Filter - MF number 1012 006M2, Wix 33114, AC ACD50, Fram C11838PL, CAV 44 (7111/44). There were two secondary can types shown in the MF manual. The one with the drain plug has a bolt up thru the bottom. The one with no drain plug has a nut on the top center of the casting that retains the can. Filter MF 1850 450M2, Wix 33194, Fram C11816PL.
NAPA or UAP should be able to source both of them. Both filters have springs in the bottoms of the cans, with washers and gaskets on top of the springs to ensure the bottom of the filters are sealed - to make sure they do the filtering job. If those are missing, fuel goes through withiout being filtered. See expensive comment above! There are also square sealing rings in the castings at the top of each can. These normally come with the filters, and should be changed. Be sure they are seated properly - they get twisted sometimes, and are hard to see and fit - you're working uphill, I always had poor lighting and the bifocals didn't work looking out the top.... After replacing, bleed the system with the two screws on the side of the injector pump - Big Dean's instructions are GREAT for that. My apologies for the lengthy reply. Hope it helps; if you need more info, just ask.
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