newbie to the site

hello members new to the site .we have 2 acres in Elmendorf tx hard to get grass going cause extremely sand area I have a 23 hp b/Stratton z425 with only 22 hrs strange was running fine now wont start . my other tractor LA115 mower acted up too .may have got a hold of bad gas . changed it on my LA115 now runs fine gonnna do the same with z425 hope it works have a nice day