Random won't start problem

[JirehCustoms]

I have a 2000 GMC 3500 that usually runs great and is a pleasure to drive. Sometimes when I hit the key it will start right away. Equally as often it will turn over for a seconds than start and run fine. 3 or 4 times now it has started and eminently died repeatedly to the point I had to either take another vehicle. One time I had no choice, I just kept starting it and prayed for about 10 min. until it started and ran. The first time it happened I thought it may have been the fuel filter so I changed it. I blew through the old one, and it blew easy so I knew that was not the problem. When it does this, I can hear the pump kick on when I turn the key on so I know it is pumping. Someone said it may be the pump relay. I havent had a chance to check that yet, just wanted to see what you guys thought.

[zach1990]

I'm gonna ask the obvious here. Did you test the battery and check the battery cables?

 

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[JirehCustoms]

Never considered that, doesn't seem to be a battery issue. Never has a problem turning over or even starting, just staying running. When it does this it will start and run for one to one and a half seconds and stops. I'll check it, just never considered it as a culprit for the problem. I have seen stranger things happen.

[txab]

check fuel pump pressure. Key on engine off.

 

What engine? 7.4?

[zach1990]

It's just I had a similar problem with my 2000 dying right after starting and dying going down the road and it turned out to be of all things a negative battery cable just barely loose

 

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