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Ford 650/750 Medium Duties Technical discussion of the new Ford Super Duty 650 and 750 series trucks with Power Stroke, Cummins, or Caterpillar engines.

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Old 01-13-2010, 11:43 AM   #1 (permalink)
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Cat C7 won't start.

Hi,

Hoping I can find someone here that knows anything about these CAT motors... I have a medium duty truck with a C7 in it that died and won't start back up. It was running fine, parked it and it was idling for a minute then started bogging and blowing black smoke then quit and won't fire back up. When cranking it sounds like it's trying to fire a little but won't take off. We have changed both the fuel filters at the engine and the water separator thats down on the frame. Air filter is clean and clear. No check engine light on either. Anybody got any ideas?

Thanks!
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Old 01-13-2010, 11:52 AM   #2 (permalink)
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Sounds like fuel starvation. What model and year is the truck and what is the fuel tank configuration?
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Old 01-13-2010, 11:53 AM   #3 (permalink)
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Originally Posted by ford_doctor View Post
Sounds like fuel starvation. What model and year is the truck and what is the fuel tank configuration?
Well... It's not a Ford. It's in a GMC C8500 2004. Has dual tanks, feed is off the driver's side tank. Both tanks have sufficient fuel in them.
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Old 01-13-2010, 03:47 PM   #4 (permalink)
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Try checking the transfer pump and the fuses.
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Old 01-13-2010, 06:11 PM   #5 (permalink)
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Need to take a fuel pressure reading while cranking the engine, should read over 600 psi or better in order to start, if lower could be hpop, or leaking o-rings on injectors!
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Old 01-13-2010, 11:22 PM   #6 (permalink)
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Need to take a fuel pressure reading while cranking the engine, should read over 600 psi or better in order to start, if lower could be hpop, or leaking o-rings on injectors!
This engine is not a PS it is a Cat. This system is not like the PS Ford. Check the fuel pressure regulator on the return side of the head and some of those of heavy equipment have screens in them. The other thing to check is the inlet restriction at the transfer pump. The screen on the heavy equipment engines are on the back of the head in a 90deg fitting.
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Old 01-13-2010, 11:27 PM   #7 (permalink)
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P.S. If you have to call a tech and ask for help call Cat or a class 8 truck shop not a Ford PU dealer. Most Ford dealers don't know much about that type engine. It is mostly used a medium duity truck and equipment the C7 ACERT is used in graders, loaders and smaller equipmet and it big brother the C9 is used in the larger ones.
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