2002 Chevrolet Trailblazer Vapor lock?

Tiny
KINSEYJAMES
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 317,000 MILES
My tbz sputters after I drive for about 20 min. The check engine light comes on. I had it checked on a diagnostic computer and nothing was wrong. Its fine when its cooled down, I know its not over heating or jerking when I stop so it can't be the water pump or fuel pump. Vapor locking is the only thing I can think of. How do I fix it?
Tuesday, June 30th, 2015 AT 6:28 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
Vapor lock is a thing of the past when we had mechanical fuel pumps. Now we have electric pumps pushing the gas. If you suspect fuel starvation, connect a fuel pressure gauge and hook it under a wiper arm so you can see what happens when the problem occurs. If the pressure drops off significantly, suspect the pickup screen inside the gas tank. They can collapse and block fuel flow, then stretch out and work again after the engine is off for a few minutes.
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Tuesday, June 30th, 2015 AT 6:43 PM

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