Df70 slow to start

[joeduke]

My DF70 starts first time when I put her in the water, we steam out for 15mins and fish for a while, when I go to start the ehgine again it does not start first turn, it take 2 or 3 turns of the key. It will do this for the rest of the day.. It start first time when cold but when shes warmed up it wont
any ideas??