I have answered this problem in the past but I would not know how to find it on the site ,so.
Start with the simple things first ,you have changed the fuel filters and the O rings??there is a copper /rubber washer under the bolt that secures the fuel filter canister replace the washer or make sure it is serviceable.
Turn the fuel of at the tank isolation valve and remove the fuel pipe ,it is a bit easier to remove the lower end of the pipe first ,it allows you to jiggle the pipe around a bit when trying to removing the valve end, also you may find it difficult to remove the pipe after undoing the tube nut ,if so use a pair of pliers and CAREFULLY twist and pull the pipe out ,after twenty plus years the sealing sleeves on the end of the fuel lines become hard and kind of lock the end of the pipe in there ,just take care when removing.I will talk about the seals later.
Next open the fuel valve ALL THE WAY and there should be a good healthy flow of diesel say enough to fill a coffee cup in fifteen seconds, LET THE FUEL FLOW FOR AT LEAST TWO MINUTES this will prove the supply is reliable.
If you find that either the fuel does not or is slow flow ,siphon or drain the tank and ,carefully unscrew the fuel valve from the tank,remove the small CIGAR SHAPED filter and inspect ,clean if required,you may find the filter is missing and possibly slopping around inside the tank this is usually the case when the part of the valve body that the filter locates on has corroded away ,you may decide to replace the valve anyway lets say the filter is good and there is no flow through the valve there is a small screw that STOPS the isolation tap from coming all the way out, remove this screw and screw the tap out of the valve body,use a piece of thin wire and poke around and clean the debris out ,when cleaned CAREFULLY blow the valve out with air thoroughly wash in gas and blow out again replace the O ring on the tap spindle this will fix another common leak on the Fergie reassemble using thread tape or sealer ,do not over tighten and make sure the valve is in the correct position to line up with the fuel line.
That is the fuel tap eliminated.
Next the fuel lift pump:
The Fuel Lift pump provides a low pressure fuel supply Approx 15/18 P.S.I. via the fuel filters to the fuel injector pump, the Fuel Lift pump includes the Glass Sedimenter fuel bowl and a fine mesh brass screen ,The screen is located under the glass bowl sealing rubber washer.
The Glass Bowl gives the operator a VISUAL on how clean or otherwise the fuel is, GOING to the filters and as you have experienced , if there is WATER/ RUST ETC in the fuel tank.
To test the lift pump :Remove the outlet/discharge fuel pipe from the fuel lift pump and with the fuel turned on at the tank operate the hand primer on the side of the pump body, every FULL stroke .
Note:
Before doing this check and make sure the priming lever is not SITTING ON THE CAM that is the pump is operated by a cam lobe on the engine and if as is sometimes the case the engine stops when the pump operating lever is ON TOP OF THE CAM the hand primer will not operate at full stroke ,if this is the case ,pull the engine stop out and crank the engine a little short burst and at the same time pushing gently down on the priming lever you will feel the lever going up and down as it FOLLOWS the cam,you want to stop the engine when the lever is at the lowest point on the cam,or the lever is at it,s highest point you will know what I mean when you do it.
The pump should produce fuel at pressure ,say 15 psi, Plug the discharge outlet with your finger and operate the hand priming lever and you will feel pressure ,slowly remove your finger and the fuel should come out under slight pressure ,this will tell you that the fuel pump is doing what it should do, there is another thorough test but this will do for now.
If there is no fuel being discharged from the pump,check the fuel line from the tank to the pump if this is o,k remove the lift pump ,strip and check BOTH the suction and discharge valves, the Diaphragm and the shaft seal Quite often the threads on the pump are a bit the worse for wear and unfortunately there is no real fix for that one so if this is the case replace the pump ,of course this would be your decision.
So we have fuel to the lift pump RELIABLE FUEL SUPPLY.
Next we remove the fuel line coming from the secondary fuel filter to the fuel injector pump,this is the line nearest the operator when sitting on the seat OR standing on the left hand side of the tractor looking at the engine and the fuel injector pump the supply line is on the extreme RIGHT HAND END of the injector pump,remove and operate the hand primer as before and you should get a GOOD STRONG SUPPLY of fuel ,again put your finger over the end of the pipe ,operate the hand primer and wait a couple of seconds slowly remove you finger and the fuel should still come out under pressure if not pressurize again and have l a look checking for leaks,if all is good up to here .
Bleeding the injector pump:
If one was to read the various instructions on Bleeding Diesel fuel systems one may end up somewhat confused so let me give you a procedure that I have used for many years as a Massey serviceman.
Just a note ,the most common thing I encounter with tractor owners and bleeding a fuel system is that most seem to be in a terrible hurry to get the tractor going,trust me the more thorough you bleed the system the more likely you are to be successful, so ,take your time catch the fuel in a bean tin and mixed with some grease ,painted onto machinery works great at keeping the rust away.
Filters replaced and primed that is undo the Banjo bolt on top of the primary fuel filter ,use a 5/8 a/f ring spanner undo half turn ,operate the primer lever till all air is out ,tighten the bolt.
Undo the BOTTOM Injector pump body vent screw (5/16 inch a/f ring spanner) ,This is the one you mentioned you got Diesel squirting across the fence into the neighbours yard anyway undo half turn, prime with the hand pump ,don,t be in a hurry the more air you get out the better,then do the same with the top vent screw.
Next undo ONE of the high pressure injector lines( use either a 5/8 or 11/16 inc a/f pipe spanner or an open ended spanner) at the PUMP pick one that is easy to get to 1/2 turn is enough then with the engine stop in the RUN position and the hand throttle set to give a high idle say 1000 rpm and with the battery fully charged crank the engine ,if you find that it is not going to start right away don't challenge the starter motor stop and let it cool for a minute in other words don't crank for more than 20/.30 seconds at a time.
When the engine starts you are now dealing with ultra high pressure atomised diesel fuel which if injected into your finger etc.. could see you loosing that limb so I suggest that when the tractor is running ,it will be running on two cylinders ,STOP THE ENGINE THEN TIGHTEN THE INJECTOR LINE This will remove any risk of exposure to the atomised fuel,restart and check for leaks.
That is the fuel system .
The only thing I have not mentioned is the Fuel injector pump internals but by your description of the events leading up to the breakdown I don't think it is the pump.
The CAV DPA injector pump requires specialist skills and knowledge and as an owner operator I would suggest that if there is a fault with the injector pump We have a RESIDENT Expert in DIESELTECH Who I am sure will help if required .
I know this is quite a long drawn out reply but I thought it may help others with similar problems.
There are a few things that could also cause problems ,things like fuel line repairs that are leaking,rubber hoses installed as a TEMPORARY FIX and as mentioned by one other member the sealing sleeves on the end of the fuel lines on the low pressure side of the fuel system, ALL lines have sealing sleeves ,Note: There are two different sizes of sleeves make sure you use the correct ones ,when replacing it is not necessary to tighten the fittings to much ,the rubber sleeves will expand with moderate pressure also be careful and make sure you don't cross thread the tube nuts when assembling which is very easy to do .
That's it from me .
As always .
happy Days.
Hutch.
