You had the pan off right? and it's all too likely that in your swap some small enough crap out into the pump and into the check ball to hold it open and make for your issue, in fact I think you already had some crap caught up which was making for you jumping pressure readings as it was!
If I am wrong then the next possibility is that as posted already the pump drive shaft has failed .
Hearing only lifter tic many times means that the Bearings may still be ok, but either way you can't now just take that for granted, so you know where this all is leading, right?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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