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Cat C12 crank no start again

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Jose Rita:
Hi all, my 2002 Patriot with Cat C12 is stuck at the mechanics with a no start.  Brought it in for service…wheel bearing,  now stuck in bay with a no start.  Cranks fine with no codes present. I have the Racor fuel system.   I did have a no start when filters were changed early this year but has been running fine since.  I have put in about 800 miles. I am lost.  Been in the shop over a week now.

Thank you

Eric Maclean Co-Admin:
Jose
A crank with no start is usually a fuel issue if the coach drove into the shop it's likely that there is air in the fuel system causing the no start.
The first thing to do is run the priming pump on your Racor fuel separator to bleed the air from the fuel system
The Racor fuel separators have a plastic sight glass which is sealed at either end with "O" rings which are known to leak allowing the system to suck air into it this may be the source of  your problem .

Eric

Jose Rita:
Eric, thank you for the suggestion, we will try purging any air out.  Hopefully that is the case and if it is, any recommendations or suggestions on replacing it with a more dependable system.

Eric Maclean Co-Admin:
Jose
The biggest problem like I said is with the o ring seals on that sight glass there have been many posts on the topic in the past which will give you part numbers for the o rings .
Some other posts will suggest replacing the fuel separator completely with a Cat part

https://beaveramb.org/forum/index.php/topic,10590.msg72127.html#msg72127

https://beaveramb.org/forum/index.php/topic,5891.msg44028.html#msg44028

Jose also check out the coach assist section of the forum library for the Racor manuals, and check common problems for the Racor issue and Cat replacement.

Hope this helps
Eric

Mike Hallgrimson:
Did you get this resolved? I had this happen on my 2003 Patriot Thunder C12. I had a relay on the ECM that was dislodged. The ECM board was next to the coach battery. Sliding the battery tray in hit the relay and dislodged it.

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