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Have a 2000 gmc w4500 box truck that starts up and runs

Customer Question
sporadically but dies out after...
Have a 2000 gmc w4500 box truck that starts up and runs sporadically but dies out after about 30 seconds
Submitted: 2 years ago.Category: GMC
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Answered in 17 hours by:
11/7/2015
GMC Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: GMC
Satisfied Customers: 23,236
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

There are quite a few things that you could have going on. You may have a fuel quality issue, low fuel pressure, an exhaust restriction, or you could be losing spark.

The first step in diagnosing the issue is to see if any fault codes are setting. Have you checked for codes?

Have you checked fuel pressure cycling the key with the engine off, with the engine running, and while cranking after it dies?

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Customer reply replied 2 years ago
Ignition code and crank sensor came up originally
GMC Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Do you know the P code numbers?

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sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: GMC
Satisfied Customers: 23,236
23,236 Satisfied Customers
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

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