engine cranks a while before it starts on 2003 Dodge Grand Caravan

when it starts there is a strong odor - not raw gas but like paint thinner

it sat for 10 days while on vacation in the garage and started right up without hesitation but now back to long cranking

1 answer
check valve, mine does the same thing. I put a guage on mine it dropped quick. Its supposed to stay above 30 psi for longer then 5 min if your check valve is ok. And its a newer pump.