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

Asked by for the 2003 Dodge Grand Caravan
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.