hard to strart

[zsnowman]

I have a 2002 GMC 1500 with a 4.8, 186K miles. My truck is hard to start after it sits for more than 15 min, to include over night, engine temp does not make a difference.
To start it takes three or four attempts with a few seconds pause in between.
To start it, I start for second or two like you normally would, release the key leavening it in the run position, letting the fuel pump run. I have to do this three or four times. When it starts it stumbles for a few seconds, and then runs great until it sits again. I have tried letting the fuel pump run for 8 seconds first, this does not make a difference.
About two years ago I replaced the fuel pump with an after market one. In the past two months I have replace the fuel filter, air filter, cleaned the throttle body, replaced the fuel pressure regulator and replaced the plugs with AC Delco from the dealer.

Thanks for any help, Bill

 

[79MKII]

I'm having nearly the same issue...did you ever get it figured out??

 

[jwd2184]

I have a 2001 GMC Sierra 1500 with 270K and I'm having a similar problem. I'm having a hard time with the first start of the day, Fuel Pump was replaced a year ago and the fuel filter was replaced recently. The fuel filter was replaced around the same time I started experiencing this problem, has anyone ever heard of a faulty fuel filter. I'll be replacing it again since it's cheap and repost the results. Also I've noticed a slight sputter while in idle, I'll be replacing plugs, wires and fuel filter and repost results. Has anyone experienced an intermittent fuel pump? I put a pressure gauge on the fuel rail and I'm getting good pressure but this pump came from some unknown online site.

 

[jwd2184]

I had the same exact thing, believe it or not it was a weak battery that finally died. This was a EverStart MAXX battery from Walmart and it only lasted 7 month. Check for lighting fluctuations.