Vehicle wont start when raining or humid out?

2000 CHEVROLET BLAZER
100 MILES • 4.3L • 4WD • AUTOMATIC
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PDW
  • MEMBER
  • 7 POSTS
Vehicle wont start when raining or humid out. Replaced distributor cap,rotor, wires and plugs about a year ago. Also replaced ignition coil about 3 years ago. Starts and runs fine when the weather is sunny. It will start perfectly if its 30 below zero and sunny. But any moisture in the air and it just cranks.
Oct 12, 2026 at 8:20 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,694 POSTS
It sounds like the fuel pump in the tank is going out, when the engine will not start use a rubber mallet and tap the bottom of the fuel tank to see if it starts, this will confirm the fuel pump failure. Also, here is a video that can help as well.

https://www.youtube.com/watch?v=lXLJbuAZ4CE

Let me know what you find.
Oct 13, 2026 at 6:55 AM
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