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Q:

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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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.