Originally Posted by blue ridge lawn care
My brothers toro efi had a similar problem; they checked fuel filter, checked for clog in tank etc. his only acted up when the weather was hot, and heat shielding the fuel lines and remounting the fuel pump away from the engine block fixed it. Your problem may be different but thats what worked in his case. Good luck!
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It was an issue with them a few years ago. But we have no idea how old this unit is. Kohler redesigned the pump mount to add clearance away from the hot engine. Toro added the insulation on the line. Both things solved the problem, IF that is the problem. Again, this is where a competent dealer comes in.