When you have an engine running problem please tell us which engine you have.
You can't have vapor lock. The fuel constantly circulates back to the tank and any air bubbles would go with it.
When it doesn't start, check for spark first. If it's missing, you need to check if the automatic shutdown (ASD) relay is turning on during cranking. The easiest way to do that is to measure the voltage on the positive terminal of the ignition coil. You should see 12 volts there for one second after turning on the ignition switch, then again during cranking.
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Sunday, May 19th, 2013 AT 1:07 AM