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Cat Man
Cat Man, Cat Engine Expert
Category: Construction and Road Equipment
Satisfied Customers: 8417
Experience:  I am ASE Master Certified.
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Cat c-15 MBN05728 Changed fuel filters will not prime. Need

Customer Question

Cat c-15 MBN05728 Changed fuel filters will not prime. Need to know location of line(recirculating line) to be removed
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Cat Man replied 1 year ago.

Thanks for asking your question. I will try and help you out.

There should be a valve at the return line on the secondary fuel filter housing. If your engine still has the recirculating line, the valve will need to be closed in order to prime the system.

Cat has advised to remove the line and cap off the ports it connects to as the recirculating line caused many more problems than it was worth.

Please reply back if you need more help or have more questions. I am happy to assist.

Customer: replied 1 year ago.
Can you provide a picture or schematic?
Expert:  Cat Man replied 1 year ago.

Let me see what I can find. Be back in a few minutes.

Customer: replied 1 year ago.
Thanks just trying to keep it simple(picture)
Expert:  Cat Man replied 1 year ago.

Here is a pick of the line near the transfer pump. IT runs up to the filter housing.

https://www.dropbox.com/s/u9gjyoo3zbzde49/1.jpg?dl=0

Let me know if you need more help. I am happy to assist.

Expert:  Cat Man replied 1 year ago.

Does your engine have this Line or has it been removed?

Customer: replied 1 year ago.
Thanks will check tomorrow and get back to you
Expert:  Cat Man replied 1 year ago.

You are very welcome my friend. I am happy I could help.

Customer: replied 1 year ago.
I am the original owner I would think its still there?
Expert:  Cat Man replied 1 year ago.

Ok sounds good. Keep me posted.

Customer: replied 12 months ago.
Please see attached pictures. If I understand correctly, it is the braided hose running down behind the fuel filter to the pump.I don't recall having this problem in the past when changing filters. Is there a check valve that would cause it to lose prime?
Expert:  Cat Man replied 12 months ago.

Yes that's it. It should run form there to the fuel pump. There should be a shut off valve at the top of the line. I would consider removing the line and plugging it off. It is not needed on the engine.

Customer: replied 12 months ago.
Did not find a valve but will remove and cap. What about engine loosing prime, don't remember experiencing problem in past.I will cap line and try hand primer.
Expert:  Cat Man replied 12 months ago.

I think that's a good idea. Cap it and be done.

As far as loosing prime. The fuel pump and the fuel pressure regulator under neath the filter housing are designed to hold fuel in the system when the engine is off. If it's loosing prime. One of the two items are the cause. The regulator is underneath the filter housing. Looks like about a one inch plug.

Expert:  Cat Man replied 12 months ago.

Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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