Problem with D5 Pump, advice?

[zeroibis]

If that is true I guess there is a reason for this product: http://www.frozencpu.com/products/12...kel_71126.html

Or possibly even this: http://www.frozencpu.com/products/16...l=g30c101s1382

If that really was what caused your issue it would in some ways perhaps be safe to say that pressure equalization can help protect your pump.