Will start then dies after 15-20 seconds

2004 CHEVROLET EXPRESS
330,000 MILES • 6.0L • 6 CYL • RWD • AUTOMATIC
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NET9
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My wife was driving down the road and the van just died. She tried to start it but did not start. It sat for 2 days as I was out of town, both of us went and the van started and ran for almost 30 seconds then it died. My company has had a similar problem with an older chevy express and it did the same thing. The crank case sensor was bad. It has proper fuel pressure when cranking so I know it's not the fuel pump. I plan on changing the fuel filter, good idea with 330,000 miles on it. In your professional opinion, do you think it is also the crank case sensor? If so, where is it located? Seen videos on line and they say it's under the starter. Is this true?
Aug 31, 2014 at 4:37 PM
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HMAC300
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scan for codes and check fuelpressure with a gauge first. autoparts rent it. try resetting your security system
Sep 1, 2014 at 6:14 AM
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NET9
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Checked fuel pressure it's at 66 psi and reset anti theft system and still doesn't start. Where is the crank case sensor located on this van? My company has the same exact year make and model van and this happened to one of those vans and it was the crank case sensor. Just need to know the location of it.
Sep 2, 2014 at 1:09 PM
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HMAC300
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it may or may not fix it that is why you scan for codes but see pic.
Sep 2, 2014 at 1:13 PM