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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 1634
Experience:  Owner at DJ Wilson
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I have a GMC 1999 school bus cat 3126 that was not cranking

Customer Question

I have a GMC 1999 school bus cat 3126 that was not cranking consistently when cold, always seemed to crank after warming up. Friend of mine thought that it was the primer fuel pump and we replaced it and now it want crank at all. Diesel mechanic came over and was trying to figure out and was going on and thinks that maybe the oil pressure is too low to ignite the injectors but he doesn't have a manual for that engine to see what oil pressure is expected
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 1 year ago.
Hi. Thanks for asking your question! I will try and help you out.
Are you saying the engine is a crank no start? Or it will not even crank over?
Does the yellow check engine light come on when the key is turned to the on position?