Join Date: Aug 2000
Location: Ft Worth, Tx USA
The GM pump gives so little trouble if I was you I would go to the wrecking yard and get a used pump. I have not had good luck with rebuilt pumps lately.
One might say that a early pump will be scarce used. The GM pump interchanges for many years, the things to watch for are; the big 1" nut where the line screws in can be for oring fitting, use the one out of your old pump it will fit. Under the big nut there is a spring and valve, use these out of your old pump also, as they match your car. Also if the can and return looks different use the orignal can on the used pump.
You can go to the local parts store and get a o-ring kit for the year of your car. You will need a special puller and installer for the pulley, unless it is a bolt on pulley, if it is, the replacement pump will need to be the same.
Upon assembly there are square o-rings, thick, and thin ones both come in the kit pay attention when taking it apart as to which are in it. Put these o-rings on the pump , with grease to hold in place, then installthe can.
The press reg under the big nut goes like this, spring, valve, then the big nut.