Question about 1999 GMC Sierra
Fill the tank to over 1/2 tank and add Chevron Techron fuel system cleaner
Do a fuel pressure test at the fuel rail.
The PSI should be 55-70 psi (or check the sticker under the hood)
Test fuel pump relay.
Check oil level and oil pressure. Low oil pressure,low oil pressure reading can stop the fuel pump from ran. It's a build in safety feature.
If it start and ran better the add only bottle of RED Iso-heat dry rule out water in fuel.
My bet is a weak fuel pump.
Fuel pump with over 110,000 miles will like to fail in a HOT day.
You are on the right track,
Posted on Jul 15, 2009
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Posted on Jan 02, 2017
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