No fuel to injectors: Cub Cadet  -- Other Tractor Brands Discussion Forum and Review No fuel to injectors: Cub Cadet -- Other Tractor Brands Discussion Forum

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 02-07-2016, 16:17 Post: 194483
infobiker



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 No fuel to injectors

Hi, been a couple years since I posted. My Cub Cadet has been running fine until last Fall. It wouldn't start. It would turn over fine, but just not start. Very unusual since it always started right off even after sitting many months. I bled the fuel filter and line to fuel pump. It then started right up. After sitting in the garage for about 5 months, I tried to start it. Same problem cranked over but just would not start. I bled the lines again, getting fuel up to the fuel pump, but no go. I checked two of the three injectors. No fuel coming out when I crank it over, so looks like something wrong with fuel pump. I've read some of the earlier accounts of similar problems, but, not really being much of a mechanic, not sure what to try next. Are there any other possible quick checks or fixes that I can try before I call in a professional mechanic for lots of $$$ ?






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 02-07-2016, 17:50 Post: 194484
Imfedup



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 No fuel to injectors

Many different models of Cub Cadet out there. Hard to offer many suggestions based on brand name only. Does it shut off with the key? If so it has a solenoid near/on the injection pump which must have 12v present in order for the pump to deliver fuel.






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 02-07-2016, 19:28 Post: 194485
infobiker



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 No fuel to injectors

Thanks for quick response. Sorry, it's a 7275. Not sure what you mean about it shutting off with key. Everything shuts down with key. I'll check the solenoid voltage as soon as I figure out where it is.






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 02-07-2016, 19:45 Post: 194488
Imfedup



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 No fuel to injectors

If it turns off with they key then it also turns ON with they key. No power to the pump, no fuel to the injectors. Look for a cylinder near the rear of the pump with a single wire attached with a spade terminal. Should be battery positive with key in both "on" and "start".






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 02-07-2016, 20:00 Post: 194489
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 No fuel to injectors

OK, thanks much. I'll check it.






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 02-08-2016, 11:51 Post: 194492
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 No fuel to injectors

Found it. 12 volts when key on; none with key off. Is fuel pump not working? Specs say a Bosch M Plunger in line. Looked at a YouTube of disassembly and repair. If that's what it takes, it will go to the a professional to work on. Any other possibilites before that?






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 02-08-2016, 12:52 Post: 194493
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 No fuel to injectors

Just noticed something this morning. Last night I checked the wire detached from fuel pump and saw it delivered a 12 volt current. This morning I reattached wire and checked, no power measured with key on. I detached again and saw 12 volts. Is this normal that no current is detected when wire is attached....or am I seeing some kind of short? Checked fuses. They are OK.






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 02-08-2016, 13:58 Post: 194494
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 No fuel to injectors

Sounds like not a strong supply such as due to weak battery or poor connection. But if battery is turning the engine over good then not weak battery.

But the bleeding of the system as you mention also sounds like there could be a small leak that only shows up over time with the fuel being allowed to slowly drain.

You could try and see if quick shots of WD40 will start if when turning over the engine. If so you have a fuel supply issue. However you may get it to run and keep it running a short time (minute or less) this way and it have no issue to crank back up. If so I would suspect you have a very small leak.






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 02-08-2016, 14:09 Post: 194495
chashm



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 No fuel to injectors

No/low voltage when the wire is connected but voltage when it's disconnected usually means the wire is ALMOST cut through somewhere so the resistance at the cut is much higher than the internal resistance of the fuel pump.
'Cut' of course is just one possibility - it may be corrosion, a loose connection, where a mouse chewed (almost) through it,a connector has worked loose, etc.

If this is it, you get to trace the fuel pump power feed from the pump back through the ignition switch to the battery. You might try running a wire directly from the battery to the fuel pump to confirm that this is the issue before spending time taking apart the instrument panel, etc. to get to the back of the ignition switch.

Can you hear/feel the fuel pump running when the ignition is on (nothing else on the tractor should be making noise or vibrating if the engine isn't running)? If so, it's not the wiring. If the pump is running, is it actually pumping fuel - take the line off at the injector pump to check (remember to bleed the injector pump after this...)? Did you turn off the fuel at the filter bowl and forget to turn it back on? Is there junk in the tank blocking the line? As it's winter ice in the lines or fuel waxed up in the filter bowl will stop the tractor dead as well.

(War story: A local kid had dumped dirt in my neighbor's Kubota fuel tank; we had to blow the lines out and also drain & clean the tank to get all of the gunk out for it to run...)

The injector pump solenoid probably has 2 wires; one for Start and one for Run; the Start wire gets energized when the ignition switch is in Start, the Run is energized when the switch is in either Run or Start. (It takes a bunch more energy to pull the solenoid in vs. keeping it in, thus the Start wire.) No point in playing with this till you're getting fuel to the injector pump though.







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 02-08-2016, 15:01 Post: 194496
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 No fuel to injectors

Thank you guys for help. I tried a direct wire from battery (red)to single wire connection at solenoid. No sound of anything running and no starting when I crank it. The problem might be partially aggravated by the anemic starter turn over that I've seen others complain about here for these Cub Cadets. It will make a couple turns and then start clicking. It's done this for the past 10 years or so, though, and a couple turns is all it ever took to start in the past. In case it was due to a weak battery, I've been jumping it with our car, still just turns a little then clicks. If I were to try the WD-40 thing where do you add it? Directly into cylinders?






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