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Got a 2001 gmc topkick with 3126 in it. Was running fine.

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Got a 2001 gmc...

Got a 2001 gmc topkick with 3126 in it. Was running fine. Went to start long cranking. Had already run into bad inj actuation sensor couple weeks back. Fixed that. I unplugged the sensor again to test. Truck started and ran. Just to make sure hooked up sensor again truck started and ran. ? No back to no start again. Tried unplugging sensor now its no start again. Checked prime on fuel system. Its good to go.

Mechanic's Assistant: What is the complete model and serial number of your machine?

The cat motor is a 3126. Ill have to get the serial number in a minute

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

8YL80873

Submitted: 3 years ago.Category: Medium and Heavy Trucks
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Answered in 2 hours by:
1/5/2019
Technician: Cat Man, Cat Engine Expert replied 3 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 10,344
Experience: I am ASE Master Truck Certified.
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Thanks for asking you question. I will try and help you out.
Does the yellow check engine light come on when the key is turned to the on position?
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