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ZR-1 Mack · 12-17-2005

I bought one from a Chevy dealer on special order and I got the round filter.It took a coupl weeks week to finally get it.

Kurt White once told me that the older solenoids with the smaller internal square filter had problems so GM went to the larger round external filter. I swapped to the round filter without any problems on my 91. The way I could tell mine was bad was that if I put a vacuum pump on the one connection and my finger over the other tubing connection it wouldn't hold a vacuum. When I got the new one it would.

12-17-2005	#2
ZR-1 Mack Join Date: Dec 2005 Location: Mid Hudson Valley, NY Posts: 72	Re: secondary vacuum solenoid filter I bought one from a Chevy dealer on special order and I got the round filter.It took a coupl weeks week to finally get it. Kurt White once told me that the older solenoids with the smaller internal square filter had problems so GM went to the larger round external filter. I swapped to the round filter without any problems on my 91. The way I could tell mine was bad was that if I put a vacuum pump on the one connection and my finger over the other tubing connection it wouldn't hold a vacuum. When I got the new one it would.