First, the law does not generally bar retaliation by a landlord, though it does for certain defined  reasons. It's not clear that those reasons would apply here.If anyone sues you without a plausible reason for it, you may have a counterclaim available for improper use of process. The question is, is the suit plausible--which does not mean that  it has to be winning lawsuit, just that there is some basis for it. So if you did cause damage to the premise, your landlord may sue you for it. If you used fuel to which you are not entitled, a landlord may seek payment for it. You can present you own evidence in defense, of course.