4020 fuel system problem

nickg · Apr 27, 2015

Started 4020 other day ran 5min and died.
Wouldnt start. Tracked it down to what I thought
was an injector pump. Had it rebuild still not
starting. So far I have cleaned all the fuel lines and
return line. Cleaned filter housing and replaced
fuel filters and lift pump. I know its properly timed
and injectors bled good.still will not start and has
a lot of pressure on the filters. After trying to start
it and I crack the bleeder on the top filter fuel
sprays out everywhere with alot of pressure. Any
other time I have opened it fuel just seeps out not
spray out with pressure.

newgenjdcollector · Apr 27, 2015

(quoted from post at 16:34:03 04/27/15) Started 4020 other day ran 5min and died.
Wouldnt start. Tracked it down to what I thought
was an injector pump. Had it rebuild still not
starting. So far I have cleaned all the fuel lines and
return line. Cleaned filter housing and replaced
fuel filters and lift pump. I know its properly timed
and injectors bled good.still will not start and has
a lot of pressure on the filters. After trying to start
it and I crack the bleeder on the top filter fuel
sprays out everywhere with alot of pressure. Any
other time I have opened it fuel just seeps out not
spray out with pressure.

Nick, you had a previous post and probably checked a lot of things already. I'll throw something crazy at you--so don't bite my head off. To me, it sounds like the pump is in the off position when you are cranking, therefore resulting in a no-start situation. Can you tell if the actuator arm on the pump is moving when you reset the throttle? Perhaps the throttle linkage came apart somewhere. If you crack an injector line while you are cranking, you should get fuel spurting out. Pressure at the filters only means so much. In order to start, you need pressure after the injection pump. Can you verify?

nickg · Apr 27, 2015

Throttle is in on position and linkages are all
working fine. Getting fuel to injectors. Bleed them
very well. Im not sure how to verify pressure after
the pump except that im getting fuel to injectors. I
just know something is causing enormous
pressure before getting to injection pump

Bob · Apr 27, 2015

The diaphragm fuel lift pump is working and making enough pressure to spew some fuel when you open the bleeder. That's what it is supposed to do!

newgenjdcollector · Apr 27, 2015

(quoted from post at 17:47:20 04/27/15) Throttle is in on position and linkages are all
working fine. Getting fuel to injectors. Bleed them
very well. Im not sure how to verify pressure after
the pump except that im getting fuel to injectors. I
just know something is causing enormous
pressure before getting to injection pump

The lift pump is only going to build so much pressure. If you prime it by hand, after awhile the prime lever will build to max and go to no resistance on the lever. If you open a bleed screw on the filter it should squirt out rather convincingly. I don't feel this is your issue though unless there is a lot of air in the system. Is your tractor cranking fast enough to start it and have you tried a whiff of ether to see if it would fire at all. If your compression isn't up to snuff, sometimes lower temps like we've had can cause difficulty starting. Try plugging it in for a few hours or overnight and see if that helps.

David G · Apr 27, 2015

Is the pump turning?

Tx Jim · Apr 28, 2015

Are you 100% positive pump isn't 180 degrees out of time?

nickg · Apr 28, 2015

Im really at a loss here. Ive been over and over everything I know to do. Pump turns. Fuel to Injectors. Pump timed properly. Air bled out and Wont even attempt to start even with a shot of either. Either the pump shop messed up my pump or theres something major internal. My biggest issue is finding a deere mechanic who can still work on my old tractor. They can work on all our newer tractors at the farm but none if them know anything about our older deeres

nickg · Apr 28, 2015

Took the pumo out same way I did last time.
Tractor on tdc. Lines on pump lined up and timing
gear wear pump drive shaft fits had the arrow
pointing to the engine block. Ive taken it out twice
just to make sure it wasn't out. Maybe it is. Im
getting frustrated thats for sure

newgenjdcollector · Apr 28, 2015

(quoted from post at 04:54:20 04/28/15) Took the pumo out same way I did last time.
Tractor on tdc. Lines on pump lined up and timing
gear wear pump drive shaft fits had the arrow
pointing to the engine block. Ive taken it out twice
just to make sure it wasn't out. Maybe it is. Im
getting frustrated thats for sure

Have you had anything else on the engine apart recently? It really does sound like something is out of time. Might want to pull the valve cover to verify the valves are moving properly.

nickg · Apr 28, 2015

Haven't done anything to engine other than take
pump out

cornerpost · Apr 28, 2015

Are you sure it is getting air? Is it a dry air filter or oil bath? Amazing where critters can build a nest. You could take hose off at intake manifold and see if it runs. If so you know where too look.

DONMYEIL · Apr 28, 2015

Just a thought , After you bleed the injectors how long are you cranking the engine ? Sometimes it takes a lot of cranking to get fuel thru the nozzles . Also If the injectors are set at max pressure a worn pump wont crack them . And last but not least ,It must crank at 450 rpm, Not just turn over . My 2 cents

newgenjdcollector · Apr 28, 2015

What gets me is that it 'ran' 5 min and died and then wouldn't restart. The question is why? How was it being used at the time when it died? Were you on it, near it when it died? Did you hear any type of noise like starving for fuel or a bang or pop? The assumption to this point has been fuel/air delivery, but I am wondering if there isn't something else going on besides the pump.

nickg · Apr 28, 2015

Just went to start it up had not run in a few
months it ran and just died like it ran out of fuel.
No noises. Anything unusual

nickg · Apr 28, 2015

Actually thought bout that and going yo be next step when I get back to farm tonite

newgenjdcollector · Apr 28, 2015

Gotcha. How much fuel is in the tank and is it good fuel? Nobody could have put some foreign substance in your fuel could they?

nickg · Apr 28, 2015

Just emptied the tank out after this originally
happened and put fresh fuel in atleast half full. Im
only two people have key to the barn me and guy I
farm with. Im thinking something else goun on
here. Um gonna see uf I havae a clogged air
intake when I get back to the farm tonite or
tomorrow

mkuhns · Apr 28, 2015

Take the return line fitting out of the pump and see if it has debris in. The pump shop may have used a different fitting allowing fuel to flow and reinstalled your fitting. If no fuel comes out the return check valve fitting, IT WILL NOT RUN OR STAY RUNNING. Too much internal pressure causes these injection pumps not to inject any fuel. If the governor ring failed, chances are there is a piece of rubber in that return fitting.

gtx1967jewison · Apr 28, 2015

Junk in the return line check valve. As stated above- first answer.

nickg · Apr 29, 2015

Governor ring didn't fail. Metering valve stuck. Put new return fitting on pump when they rebuilt it

mkuhns · Apr 29, 2015

I have a hard time believing the metering valve just stuck if it was running when this all happened. They normally stick in the off position after they sit for awhile. The only other possibility is that the the assembled the head and vane pump the wrong direction of rotation and calibrated it that way. Does fuel come out the return at all????? NO RETURN FUEL = NO RUN. I'd pull the return fitting out and see if it is air locked. I've had these pumps before a few stupid problems like these too.

4020 fuel system problem

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