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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8679
Experience:  I am ASE Master Truck Certified.
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C15 2003 international 9400 fuel issues will run on starting

Customer Question

C15 2003 international 9400 fuel issues will run on starting fluid. Changed both fuel filters
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.
Could you elaborate on your question please?
Are you saying the engine will crank and not start?
Does it stay running after using the starting fluid?
Customer: replied 1 year ago.
Stays running on starting fluid
Customer: replied 1 year ago.
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Expert:  Cat Man replied 1 year ago.
Thanks for the information.
There are three things I have seen cause this.
The first is low fuel pressure while cranking. If it is below 30 psi. The engine will not start. This can be caused by a weak fuel pump or faulty fuel pressure regulator.
Second is low DC power to the engine ECM while cranking. When starting fluid is used, the starter is released and then the ECM gets enough power. If power drops below 7.5 volts, the ECM can not function.
Lastly is worn injectors. When the poppet seat in the injectors get worn. They can not make enough pressure at a crank rpm. But when starting fluid is used. The rpms get high enough so the injectors can make enough pressure.
Please reply back if you need more help or have more questions. I am happy to assist.

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