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Re: Chevy Caprice does not start after driving in summer
Fuel bleed-off is also a possibility. This can be through injectors or a pressure regulator, although the regulator in an '06 may be in the tank, making that less of a possibility. If the leakage is through the injectors, the accumulated fuel will flood the engine. After several hours of sitting, the excess fuel tends to evaporate, allowing a normal start.
As the SandMan indicated, a pressure gauge will be very helpful. Not only should the standing fuel pressure be checked, but after the pump is off monitor the residual pressure to see how quickly it drops.
Another thing that may help starting after heat-soak is to invoke the Clear-Flood Mode by holding the accelerator to the floor while cranking. Be ready to release it IMMEDIATELY as soon as the engine starts. Opening the throttle past 80% not only admits more air to dilute any accumulated fuel, but also cuts off injector pulses while cranking to prevent further flooding.
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