Hi all, I have craftsman 18.5 HP, mod# 31p777
type 0299e1
code 041004ze.
Fuel is flowing down to carb,( gravity fed) I have spark, engine turns over, but won't start, backfires when trying to start.
Fuel cap not blocked, put some fuel in carb, still no firing.
I cut grass for approx 45 mins...