I recently installed a Bosch Fuel pump. It ran fine at first, then after about a week It starts great when cold in AM, but if truck is shut off for approx. 10 min or more, when you go to start it, it just cranks then starts It will have a minor rough idle then clear out and runs fine This is 2nd pump in 4mnths there are no check engine codes In the past 1 1/2yrs I have replaced Converter,02 sensor, Igniter,Map Sensor. New exhust all welded no clamps, there are no cracks in exhust manifold. Timing chain/water pump installed 3yrs ago. What are the chances of another defective pump? Could it be a dirty fuel filter? be honest couldn't tell you when last replaced . Any advice will be greatly appreciated