Should have a manual tap on that year (most countries). Definately consider rebuilding the pump and expect to change the filter again. You might go through a few filters in a short time as crap dislodges, so it would pay to clean out that tank. A thorough clean of the carbs is essential and if things stay dirty upstream you may have to clean them again. Gel and wax like material in aging fuel can seal up the filter medium. Check the mini strainer type filter in the carb inlet barb (I remove it). The lining of old fuel hoses can also dislodge.
Give that poor old girl a birthday.
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