Date registered: May 2010
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i would leave the 84 pump in, start switching them is not going to be fun.
U need to tear out oil filter too or else the pump cant go backward.
I have changed pumps in ford 6.9 , 7.3 one need to balance on the rad resting your pot belly on it like an acrobat.
mercs can be more forgiving, but i would leave it there and drive it, probably emission will go thru, dont say anything anyways.
just leave the connector out, cap it so it would not be grounded.
home of the 4,5,6 and 8 cylinders.
from happy British Columbia.