I think the 86 is TBI. Not sure but I think 85 had either a carb or TBI and
86 was all TBI. If its a carb, the filter is inside the fuel inlet on the
carb itself. If its TBI, the filter is on the inside of the drivers side
frame as described before.
I own an 86 K5, and it's carbureted. The fuel filter is located in the carb
inlet fitting. Remove the fuel line from the carb, then take out the large
"nut" that's left in the carb. The filter, a spring, and a small plastic
o-ring are inside. Take note on how they are installed. I would recommend
adding a larger inline filter right before the fuel pump where there is a
short piece of flex hose.
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