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Cat Man
Cat Man, Caterpillar Engine Expert
Category: Heavy Equipment
Satisfied Customers: 8811
Experience:  23 Years Caterpillar Engine experience.
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2002 c15 cat will not start. Turns over will not crank. Sensors

Customer Question

2002 c15 cat will not start. Turns over will not crank. Sensors are ok, no air in the fuel line, EMC is fine, getting fuel, just will not crank up. ANY suggestions?  It will crank with ether, but not stay running
Submitted: 6 years ago.
Category: Heavy Equipment
Expert:  Cat Man replied 6 years ago.
Hi. Thanks for using JA. I will try and help you out.

Does the engie smoke when you are trying to start it?

Also, when you say it is getting fuel, how can you tell? Does the engine have a hand primer pump?
Customer: replied 6 years ago.

no smoke, no primer pump


it is getting fuel from the main filter, and it has fuel coming from the return line going back to the tank ..pulled lines loose to see this

Expert:  Cat Man replied 6 years ago.
Thanks for the information.

The reason I asked about the hand primer pump is because it takes at least 35 psi to make the engine run. If you had a hand primer pump, you may be able to operate it and the engine may crank. But since you do not have a hand primer, the only way to verify this is to install a psi gauge in the fuel filter manifold and measure the pressure. If it is low, you either have a failed fuel pressure regulator or transfer pump. Since you seen fuel returning, I would lean more towards the regulator.

Customer: replied 6 years ago.
where is the fuel pressure regulator located? I have a "pick up" fuel pump that is gear driven, bolted to the front of the engine.
Expert:  Cat Man replied 6 years ago.
The regulator is located in the secondary fuel filter housing. It underneath the bottom beside the filter. It looks like a 1 inch plug.
Customer: replied 6 years ago.

Is there a way to check the regulator, without replacing it?



Expert:  Cat Man replied 6 years ago.
The only way would be to cap off or restrict the return line. If the engine starts. You'll know the regulator is bad.
Expert:  Cat Man replied 6 years ago.

Hey. I just wanted to see how things were going.


Please let me know if you need more help.