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Did you apply silicone to the Burst Panel cages and plate?
As I was advised by Ron Hayes @ The Blower Shop: 80w-90 Gear Lube (just make sure it has Zinc included in it)
I had this same condition on a 110 pump last year. Engine would not respond to pill changes. Found pump inlet side o-ring torn. As preventative...
Sean, Check your PMs, please... Thanks, Mike