Is this my fuel pump?

2005 CHEVROLET ASTRO
210,000 MILES
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AMORRILL
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After the car warms up (30 min drive) it will not start after sitting an hour but will start after 4 hour. never have a problem when the car sits overnight. dealer can not find the problem, the tell me te fuel preassure is good, and they did replace a fuel flow sensor (that seemed to coorect the problem but was back in two months). From what I am seeing on other web sites it could be the fuel pump or the air regulator. what is you take on this issue. have you seen it before?

Feb 21, 2012 at 10:25 PM
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RASMATAZ
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Next time it refuses to start don't wait for nothing look for fuel and spark-start here
Feb 21, 2012 at 10:41 PM
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AMORRILL
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Spark is ok, I can only go by what the deal told me, they tell me that there is fuel pressure.
Feb 21, 2012 at 11:07 PM
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RASMATAZ
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Is it the correct fuel pressure? Best check yourself to be sure if its within specs
Feb 21, 2012 at 11:48 PM
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AMORRILL
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I will need to get a fuel pressure gauge. Would the fuel pump explain not being able to start after one hour sitting but starts with not hisitation after 4 to 5 hours?
Feb 22, 2012 at 1:20 PM
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RASMATAZ
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Check the fuel and spark-could be spark problem instead of fuel verify both
Feb 22, 2012 at 2:52 PM
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AMORRILL
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It is not a spark issue, Also not that you have put this under an 05 Astro, this is an 05 OPTRA.
Feb 22, 2012 at 3:03 PM
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RASMATAZ
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Since its not a spark and fuel issue -check engine compression-this time I want some testing results when you comeback-
Feb 22, 2012 at 8:01 PM