I have a rebranded Murray snowblower (Noma) with a Tecumseh 8hp engine. It's about 22 years old and besides a few rust spots here and there, it's been excellent. Yesterday, I was getting it ready for the upcoming season and noticed the plastic gas tank is cracking in several spots. It's not leaking yet, but I'm not taking any chances and have ordered a replacement. I've never had this happen on any of my OPE before. Is this common with Tecumseh?