issue

[Bob Gaines]

After all of this debate on possible culprits, if the symptom continues to happen changing out the pump is the first thing that I would try. Of course that is just me that has had to deal with similar symptoms on many cars over decades. You do what you think best. I think that the rebuilt pump core is around 83.00 from NAPA with your core exchange. New is 220 with no core. Or you can send out your pump with your reservoir(if its the correct one) to Rodes Restoration (Roger Rodes)419-468-5182 who has been doing this for decades and you will get back what you sent. If you think it is original to the car that is important IMO and so confirm that you want yours back with Roger. I think the rebuilding of your original pump (if you think so ) is the best option  IMO.