Deutz Run On help

woodlandfarms · May 30, 2016

Okedoke, another new issue. I noticed that when I shut down my tractor (turn the key off) If I have the throttle up the engine keeps running. or takes a while to wind down.

Now last year I had a big issue with water in the fuel tank (came from a bad batch of fuel). What I did not know is that the water sat in the gas tank for a while and rusted the bottom. Since then I have been dealing with plugged filters from the rust coming off the bottom of the tank. That is now pretty much gone but I am wondering if maybe some grit got into something important on the deutz.

I don't know if the machine has a solenoid off or how the fuel system works. Any ideas willl be greatly appreciated. I am assuming something is sticky when it should be shutting off..

Oh I am running a lot of diesel fuel cleaner to make sure that there is no condendstion left in the bottom of the tank. Maybe that is causeing the run on ....

DT86 · May 30, 2016

First thing is to find the shut off solenoid and see what it is doing, or not doing.

ponytug · May 31, 2016

Carl- Sticky or bad fuel solenoid. If it were me, I would take it out, clean it, and try it again to make sure that it cycles well. If it is good, I would put it back in, if not, new solenoid.

All the best, Peter

woodlandfarms · May 31, 2016

Just learned something new.....

While it may very well be a sticky solenoid, Terry thinks it might be related to the cooling fan. He says that they can start to generate electricity when shut off. So, driving the tractor hard, fan is running, turn the engine off with throttle up a bit and the fan will back feed the solenoid keeping it on.

Hows them apples?

Industrial Toys · May 31, 2016

A diesel engine can't possibly run without fuel. If it is an old school injector pump, the shut off must not be closing. The fan generating power is a new one on me. Just look at the solenoid and see what it does. If it is the fan, you could probably put in a relay or maybe just a diode in a strategic location to isolate the fan from the solenoid. One would have to see a schematic.

ponytug · May 31, 2016

Easy to check. Leave the hood up, and yank the fan fuse.

It would only do so for a few seconds. How long a run on are you talking about? Does it stop all at once, or does it slow chug down to zero? The former could be the fan, the latter would seem more like fuel starvation from a sticky solenoid.

All the best, Peter