2003 chevy npt starting sometimes

[97 gmcguy]

ok so my dad has a 2003 chevy that has the 5.3L in it and it had the fuel pump and fuel filter changed out and new fuel lines put in. every once in a while it will try to start but never fire. if u wait 8 minutes it will finally start. sounds lik eit could be electrical but no clue what it could be. any help would be very helpful. thank you

[MR NASTY]

During this problem can you hear the fuel pump when you turn it on?

[97 gmcguy]

yes always

[97 gmcguy]

could it maybe have something to do with the computer?

[MR NASTY]

When it does it is it at a certain time. Like when you first start it or after a long drive?  Was the fuel line replaced front to rear?  If so is it possible some of the wiring got knocked loose?

[97 gmcguy]

it happens after short and long drives just randomly and it was just a section of the line.

[BIG DOG]

i know its lot of work but maybe a bad pump  presure test it when it wont start  get some gas in a squirt bottle see if it starts   from that.            is it loosing prime kind of thing  or  vapor locking

[97 gmcguy]

we had it pressure tested and thats all good. and the pump turns on everytime so not sure about loosing prime or vapor locking

[97 gmcguy]

it started using starting fluid in the intake so maybe vapor lock could be possible. if it is vapor lock how do u get rid of that on fuel injection?

[BIG DOG]

change the gas cap 6$    and i think there was a line that goes from fill tube to tank with a check valve thing   some body may recall this after reading it     i think you can smash it to break it loose  i think it was exspenvie.    call auto zone and see what they say about it     thers a few mach on the post lets see what they say befor you smash anything forsure.

[97 gmcguy]

oh alright well ill give that a try and if anyone has anything else in mind the help would be greatly appreciated. thanks big dog