If you start disturbing all that sludge, It's gonna bite you in the *** eventually. You've just gotten lucky. We can debate all day but I've seen it first hand over & over again. We had 3 Techs in our dealership. Me Butch & another guy. Me & butch would never disturb the sludge and just carefully swapped the Pump & Screen. 100% success rate. The other guy insisted on scraping & flushing. he had a 50% success rate at best. Butch Grabinsky :prayer:is by far the best Tech I've ever known and he'll back me 100% on this. Scraping sludge = Blown engine:glasses7: