Medium and Heavy Trucks
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The most common cause of this is the check valve on back of cylinder head for fuel return leaks by overnight, draining cylinder head of fuel,,longer crank time is needed to refill head before it will start.
Change the check valve on back of head.
It's also possible the fuel pump or something on suction side is allowing fuel to drain back but not as common.
I have replaced a ton of these for the same problem, its kinda a known issue.
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