I just purchased one of the 60" 28hp efi. Every time I run out of gas in one of the tanks I switch the valve over to the other tank and the motor just keeps sputtering and the check engine light comes on. After a few minutes the motor shuts off cause it is not getting enough fuel to run. Then I sit there and try to start the mower over and over. It usually takes about 20 or so tries to get the mower to start up. Then I really got frustrated yesterday. The mower was running out of gas so I switched it over to the other tank which was completely full of gas and of coarse it sputters then dies. So here I go trying to get the mower to start again. I tried for probably 30 minutes to start it. By that time I ran the battery dead from trying to start the mower so many times. I then had to leave the customers house to get something to pull the mower up on the trailer. When I got back I tried to start it again and see if there was enough juice left in the battery to try turn the motor over. The motor did turn over and after the 3rd time it started right up. Can someone help me out as to what the problem is here? It gets old having to sit there for 10 minutes or more trying to start the mower everytime one tank runs out of gas. I just wish both tanks stayed open all the time.