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spankyjr1, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 2597
Experience:  I worked on all types of equipment semis,forklifts,farm,ect.
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My 12.7 Detroit has developed a lazy starting condition

Customer Question

My 12.7 Detroit has developed a lazy starting condition mornings where I need to ether it to start , it's fine the rest of the day
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  spankyjr1 replied 1 year ago.

Hi, my name is ***** ***** you for your question, I will try and help you out.

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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