1990 GMC Suburban 1500 350ci: Runs great 20 minutes....

PhyllisMs

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Runs great for 20 minutes and then just shuts off. No fuel. Will restart in 10 to 20 minutes (seems it restarts after cools a little) and will run perfect for 15 or 20 minutes before it shuts down again. Checked for fuel at injectors and wasn't shooting fuel in carb right after it shut down. Something is shutting off my fuel.

We have replaced the fuel pump, fuel filter, oxygen fuel sensor and have replaced the engine coolant sensor.

What could cause the fuel to just shut off but flow freely in 10 or 15 minutes after shutting down and run great for another 20 minutes?

Help!
 


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