Solenoid code for check engine light and now car won't start

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Brought my 2007 Subaru Forester to my local mechanic because the check engine light came on today. Code was for a solenoid issue. They reset the computer and told me to keep the fuel tank above half for now. I went to fuel up and when I try to start the car again it took me 4 attempts. Turned it off and on again with no problem, but I've never had that issue before...