I have taken it to a garage. They put in a new battery,new starter and replaced the fuel pump 3 times .It will start the first day,then it will start the second time and then it won't start at all.

What is your question?

Try to start it and it won't start the first time ,then it would the second time after the fuel pump is replaced but then two days later it won't start at all.

What makes this problem better or worse?

When engine is warm or cold.

How long has your 2008 GMC Envoy had this problem?

About 3 weeks