Having problems with your 2003 Chevrolet TrailBlazer ?

Trouble turning over only in the Morning

\015 This is the strangest thing: My 2003 Trailblazer cranks, but takes much longer to start in the mornings. Have been told the fuel pump is failing, but it only does this in the morning. Doesn't stall, jerk, etc any other time. Fuel filter and relay switch have been replaced. Anyone have any ideas? I'm afraid I'm going to be stranded on the interstate.\015 Posted / edited by AnonymousUser on : 10-12-2018

Answers :

I would agree with the pump being the possible cause.
The fuel system runs on about 50 - 70 psi when the engine is running. When the engine is off, there is a check valve in the pump to "hold" the pressure and not let it back into the fuel tank. If the valve is weak, fuel pressure can flow back into the tank and then it takes a long time to build that pressure back up, especially after the truck sits overnight.
A mechanic would check the fuel pressure with a gauge before and after the engine is first started to confirm this.
Repair Help & Product Troubleshooting for 2003 Chevrolet TrailBlazer

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