hard start when weather gets hot

[stahlhelm35]

I have a 2002 Sierra 1500 sle with the 5.3l. I experience this problem every year, when the outside temp gets hot, summer time. In the winter, its fine. What it does is not start like it normally does. Sometimes it takes three or four times of cranking it over, to get it to start. I know its fuel injected but pumping the throttle a few times seems to help. I cant figure why it does this. If it was a fuel pump issue, wouldnt it do it throught the year and not just the summer?

Jeb

[Morgan1986]

I am not really one to give advise because I don't know much . All I can think of is the basics air and fuel . In the summer the air is thinner maybe its a air thing. Some guy on here is just going to tell you to get it scanned and take it in to the dealer seems to be almost a common response now. There is a other guy that does give out pretty good advice on what might be the problem . Maybe he will chirp in . I am assuming since your on here like alot of us you dont have the money to just take it to GM and get them to scan and work on it .

[txab]

The first smart thing to do is to scan it for codes with a good scanner. Post any codes

 

Check fuel pump pressure. Key on, engine off. Post reading.

 

Check fuel pump regulator for presence of fuel at the vacuum line

[stahlhelm35]

If its one or all of the things you listed, wouldn't it do it when the weather is hot or cold outside? Or would the heat be affect the fuel more?

Jeb