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Cummins Diesel Fuel Cutoff Question

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Howard H.

07-20-2007 20:13:04

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Can anyone explain about the fuel cutoff on an 855 Cummins diesel?? It's a common truck motor and we have one in the 895 Versatile.

It's not getting fuel - not sure why. The fuel line is clean and flowing, new fuel filters, and the engine will start on ether but not run on diesel.

The cutoff is a small heavy electromagnet with a single wire to it. We're getting 12 volts with the switch on. The electromagnet apparently pulls a small quarter-sized disc against a springy plate that cuts the diesel on and off.

The magnet is throwing a field with juice - do they still "go bad" beyond that? Are they common to fail?

The cutoff seems to be plumbed more to the side of the fuel return line instead of the feed line after the filters on the tank side. I don't really understand why it would be designed like that.

Thanks for any info,
Howard

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Tim in OR

07-20-2007 20:22:23

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Re: Cummins Diesel Fuel Cutoff Question in reply to Howard H., 07-20-2007 20:13:04

If you look at the front part of the shutdown solonoid, there is a knob. if you turn it to the oposite extreme, that will put the pump on "manual". You will be able to run the engine if it is a solonoid problem. you wil not be able to shut it down unless you can kill it, or turn the knob back. Shutdown solonoid problems weren"t all that common on the 30 truck fleet I worked on, but they did happen ocasionally. Good luck
Tim in OR

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