MF300 Fuel System Bleed--

[Campbell 2000]

I have a Massey 300 backhoe. It is new to me but it is an older machine.
Originally it ran when started but then one day it would not. I added fuel and repaired the fuel shut off with a new cable, removed and cleaned the fuel bowel.replaced the fuel filters and followed the bleed instructions.
I have fuel right through to the blled side of the injection pump but do not have any on the injector side. I have tried to bleed, even removed the lines at the pump but nothing. Is there a trick to bleeding through to the injectors? I have cranked it about 10 times for about 20 secondes each time. The only thing I see from other discussions was my throttle position was at half not full.

2000

 

[shona13]

G,day Campbell.
Sounds like the stop lever is stuck inside the pump,uness you know a bit about injector pumps it is best left to a fuel injection specialist.
Hutch.

 

[Campbell 2000]

Hutch
First, thanks for your input. I was starting to think nobody had a suggestion.
I wish I had a mechanical drawing of the pump to know if the stop is the next device in line to the actual injection side of the pump.
I did replace the caable for it as it was seized up. But the run stop leverseems to move freely, not to say it not snapped inside.
I was contemplating removing the end of the pump at the inject side to see if I can determine if there is anything not looking right but have been waiting to see if I got a response that would solve the issue. I have cracked all the inlet lines and have fuel there, just nothing going through to the injection side.
Maybe I need to find a local dealer who can get a reconditioned pump.
I really appreciate your feed back and thanks for writing.

2000

 

[shona13]

G,Day Campbell 2000.
Can I ask.
You have a good healthy flow of fuel to the injector pump and you have undone the two small bleed screws on the pump and pumped until there is NO AIR coming out, to make sure all air has been eliminated open both bleed screws on the pump say one turn each and operate the priming pump for at least two minutes( the fuel should squirt out about 12 inches if all is well ) if there is air present you will hear the hiss as it is pushed out of the pump,consider this to be the most important part of bleeding a diesel fuel system as the least bit of air in the pump will ruin a good battery only trying to start the engine,when you are totally sure there is no air in the system undo ONE injector pipe ,one turn is enough ,make sure all the other injector lines are tight ,with the engine stop in the run position and the throttle set at about half ,there is no need to set the throttle fully open this only increases the danger of high pressure diesel injection if you put your hand anywhere near the loosened injector pipe.
This done crank the engine as you have done do it in stages say 15/20 seconds at a time making sure the starter motor is not overheating and by doing it this way is much more kind on the starter motor .

The injector pump is a very precise piece of equipment which requires specialist testing equipment and KNOWLEDGE and I would like to suggest if you dont have either one seek the assistance of a mechanic with this knowledge it should not cost that much and it may save you loosing your hair
Your question about removing the pump end plate will not reveal anything except the low pressure pump priming vanes and it may possibly indicate the general condition of the internals of the pump but that wuold be all Do not remove it.
try all of this and dont be in to much of a hurry ,if after bleeding the fuel system your thumb is blistered you have bled the system properly:laughing:.
That all .
Regards.
Hutch

 

[Campbell 2000]

Hutch
Thanks for your input. Yes I have bled the fuel bowel, both filters, and the pump bleed screws. There is good fuel flow from the pump bleeders. There is nothing from the injectors. That was why I disconnected the injector line right at the injection pump. I wanted to see if there was any fuel from the pump to the injectors. I have tried the turning over of the engine with the started at least 12 times and not even a drop of fuel. I even went through the full bleed process at least 6 times. Lots of fuel to the pump and in the pump but nothing out of the pump. You mentioned in your first note the fuel shut off. I am going to make sure that the shaft turns freely without the arm attached and see if there is a possibility that it has turned 180 degrees while I had the arm off. If there is still no fuel to the injectors I am guessing there is an injection pump defect which will require a new one.
Thanks for the feed back.

2000

 

[shona13]

G,Day Campbell .
I would not look at buying a new pump it would cost nearly as much as the tractor , if it comes to it, remove the pump and have it serviced maybe and if you think it worth the expense do the injectors while you are at it.
The injector pump is very much a serviceable item.
Regards.
Hutch.

 

[Dieseltech]

If tractor has been sitting and not run for awile inj pump may have stuck plungers and/or a stuck metering valve and will need removed for repair. Worst case is head and rotor may be seized too. I see this on most pumps I repair on equipment that is not used often.

 

[shona13]

G,Day dieseltech.
I thought you had got lost we have not seen you around for a while ,Good to know you are still with us ,.
Regards.
Hutch.

 

[Campbell 2000]

Hutch

Well sir your very first comment on checking the fuel run/stop valve proved to be the problem. As I mentioned yesterday I was going to see about turning the valve 180. Well there is an interna stop as well so that did not happen. However with the lever off and a pair of piers on the valve it loosened something up as I imediately got fuel out of the injection side. Bled the injectors, sprayed some quick start and away it went.
However what ever was wrong with the stop is still wrong. The tractor will start up now which is the main thing. But when I pull the stop, the engine revs even more as if I am pulling the throttle. Plus the engine does not stop. I for now just place it in gear and stall it.
Regardless, you were very helpful and I thank you more than you know. This was a problem that was driving me nuts trying to figure out.
Thanks for your help.
Bruce
2000

 

[shona13]

Campbell2000.
No worries, now Get back to work and dont use that excuse again
Joking ,Only to glad to help .:thumbsup:
Regards .
Hutch.
P.S. Dieseltech is back he will be able to tell you what is going on Inside the pump.