JD 3020 Diesel No Fuel to injectors

We're working on a 1965 3020 diesel. SN SNT123R078382R We have replaced fuel filters and we've bled lines to the injector pump but we are not getting fuel to flow from loosened injector lines on cylinders 1 and 3. The engine turns over and fires on ether. The manual fuel pump has produced good line pressure to the injector pump. This tractor is not used regularly and has sat in a barn for a few years. It ran briefly last summer, but after shutting it down we have not been able to get it started again. Today we tried towing it and still did not get fuel flowing to the injectors. Looking for possible solutions with pump rebuild being the last resort. Thanks, FarmKid

Your metering valve, and plungers are hung up. (stuck) This is a very common problem caused by ultra low sulfur diesel. Adding soy diesel to the blend or using (home brew) makes the problem much worse. It is common enough that I see at least one to two pumps a week from this. If this pump has many hours on it I would suggest its time for a reseal. This should run in the 400-450 range in my shop. A 3020 is a tractor that holds its value well. Putting a few bucks into repairs isn't a bad investment. Al

Did you check the fuel-pump by cranking the engine over or are you testing with the hand-primer? The latter can make a false test.

If you are dead-sure it is getting fuel to the injection pump - you need to verify the pump is actually turning. Just take off the timing
window and look inside when the engine is cranking. 1/2 of what you see should be rotating. If not, the driveshaft is broken and it is
likely the pump is shot.

If you ascertain the pump IS turning inside - I'd take the three-bolt cover off and see if the metering valve is free.

If that is okay - I'd then hook compressed air to one of the high-pressure discharge ports and rotate the pump until whatever port you use is
in inject position. The air will travel backwards and go against the two fuel plungers. Sometimes this will free them up.

What Al said, stuck internal parts from setting. Been seeing more of that lately on pumps in for service. HOPEFULLY the head is not seized and drive shaft broken..

(quoted from post at 14:21:13 05/06/18) Your metering valve, and plungers are hung up. (stuck) This is a very common problem caused by ultra low sulfur diesel. Adding soy diesel to the blend or using (home brew) makes the problem much worse. It is common enough that I see at least one to two pumps a week from this. If this pump has many hours on it I would suggest its time for a reseal. This should run in the 400-450 range in my shop. A 3020 is a tractor that holds its value well. Putting a few bucks into repairs isn't a bad investment. Al

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Thanks for the info. I'll check into these next chance I get to work on it.

(quoted from post at 19:31:47 05/08/18)

(quoted from post at 14:21:13 05/06/18) Your metering valve, and plungers are hung up. (stuck) This is a very common problem caused by ultra low sulfur diesel. Adding soy diesel to the blend or using (home brew) makes the problem much worse. It is common enough that I see at least one to two pumps a week from this. If this pump has many hours on it I would suggest its time for a reseal. This should run in the 400-450 range in my shop. A 3020 is a tractor that holds its value well. Putting a few bucks into repairs isn't a bad investment. Al

Click to expand...

Thanks for the info. I'll check into these next chance I get to work on it.

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It's been a few months, we've had a chance to check a few things. Here is new status.
1) We confirmed the pump is turning by viewing through the site cover.
2) We pulled the cover held by 3 small screws to try to free up the metering valve etc. Not sure where the valve and connections are in there, but couldn't diagnose anything sticking and everything seemed free.
3) After putting back together we tried again to start. We were getting diesel fuel leaking from 1st 2 cylinder injector boots, so we replaced all four boots. No leaks now.
4) Still no diesel fuel coming from the injector lines that we loosened when we started working on this.
5) Does anyone have a picture or diagram of the metering valve and plungers so we can be sure they are not stuck?

Thanks for the help.

New here, don't know if I should start my own topic or add to this, but symptoms sound the same as my situation, and I hadn't seen a resolution here.

Got a 67 3020 diesel T113R. Bought in ~99. I don't use it much, I've put probably ~200 hours on it since then.

First issue I had was leaky rubber boots at injectors several year ago. Replaced those, good to go. Probably 2 to 3 years ago, after sitting all winter in the shed, I'd charged up the batteries and went to start it. It was a no go. It's fire in ether, but then did. Wasn't really pressed to use it, so I blew it off until now.

I'm not getting fuel at the injectors, rather I've cracked all fittings loose on fuel line at each injector and cranked engine over quite a bit, but nothing.

Last year I was semi in the mood to tackle this and had drained the tank, changed fuel filter(has the lone glass looking square filter). Used primer to fill up filter and then some but still no go, so stopped until now.

This time I've topped off the tank. Loosened fuel in line at IP and hand primed fuel to that point. With that line off, I've cranked engine to observe fuel flow from transfer pump, it flows. I'd check transfer pump pressure, but can't find any specs. With IP line loose, gravity keeps fuel flowing.

So at that point is when I cracked fuel line at injectors to check for flow while cranking, nothing.

I loosened timing window cover to see if debris comes out, but it was only clean fuel.

Since my tractor isn't running at all, cept for ether starting, I'm assuming it has nothing to do with a clogged return line.

Any thoughts/advice?

Prior to sitting a couple years, tractor ran great!