no fuel going to two injectors on 763

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Johnboy

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I bought a 763 that person said it ran out of fuel. Replaced fuel pickup tube and screen but cannot get fuel to the two middle injectors. Injector pump looks like it is cast as part of motor. Any idea what the problem could be. The injectors on the end seem to be getting fuel.
 

antfarmer2

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There is a shut of valve right by the pump open and pump the ball to bleed the air out shut the valve and start might take a few times
 
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Johnboy

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There is a shut of valve right by the pump open and pump the ball to bleed the air out shut the valve and start might take a few times
Thanks but have tried that already many times. The machine has sit for about a year and was wondering if seals in injector pump had gone bad or something. Bulb pumps up hard and we have drained fuel and air out but cannot get fuel out of pump to the two center lines to injectors.
 

antfarmer2

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Thanks but have tried that already many times. The machine has sit for about a year and was wondering if seals in injector pump had gone bad or something. Bulb pumps up hard and we have drained fuel and air out but cannot get fuel out of pump to the two center lines to injectors.
Did you loosen the nuts on the lines 17 mm I think the gently pull the steel lines then have some one crank it and see if the fuel comes out
 
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Johnboy

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Did you loosen the nuts on the lines 17 mm I think the gently pull the steel lines then have some one crank it and see if the fuel comes out
yes loosened up all lines blew them out and still not getting fuel on #2 or #3 out of injector pump. Is the injector pump cast on the motor because we could not see how to remove it from the engine.
 

antfarmer2

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yes loosened up all lines blew them out and still not getting fuel on #2 or #3 out of injector pump. Is the injector pump cast on the motor because we could not see how to remove it from the engine.
I have a 743 not sure how much differant yours is can't see it from here but if you can tell us all you have done and tryed there is a lot of great guys in here that can help
 
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Johnboy

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Anyone know where I can get a diagram of the injector pump for a 763.
First Thanks for all your help. We have changed the fuel tube, took all injector lines off and blew them out. We are getting fuel on 1 and 4 but with lines loosen up at injector pump nothing out of 2 and 3. we have turned engine over and pumped bulb but still nothing out of 2 or 3. we did not blow into injector pump for fear of damaging something. What is under the top of injector pump that has 4 bolts holding it down?
 

Tazza

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First Thanks for all your help. We have changed the fuel tube, took all injector lines off and blew them out. We are getting fuel on 1 and 4 but with lines loosen up at injector pump nothing out of 2 and 3. we have turned engine over and pumped bulb but still nothing out of 2 or 3. we did not blow into injector pump for fear of damaging something. What is under the top of injector pump that has 4 bolts holding it down?
I know it's been said, but the bleed screw must be closed, if that has been done, you have tried everything i would, it's possible something is stuck inside the pump. The problem is, the pump is not servicable by the general handy man, the parts inside are very precise and tuned so they all deliver the same abount of fuel. A diesel injector shop will need to do the work.
You can remove the delivery nozzles on the pump, there is a one way valve and spring under here, do not dig much deeper. You will see a round piece with a hole in it when looking down. This is the element, this is the part that is timed, if it pulls out, you have messed your fuel delivery up on that injector.
There are 4 bolts holding it down, as you noticed. I believe you need to remove the inlet manifold to get the pump out. Remove the 4 bolts and you need to remove the fuel shut off control or the throttle, i can't remember what one now, sorry. The pump should slide up, you may need to slide the rack across to get it out of the notch in the block. There is a spring at the left hand side that you need to watch when you re-install the pump too, this pushes the rack tot he right.
With the pump out, ensure the middle two segments with wheels on them move freely and not stuck upwards. If they are stuck, try and pull them down, if they are stuck tight, it has to go to a shop to get repaired.
 

Fishfiles

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The message you are replying to: Posted By: Johnboy on 12-04-2013 03:43 PM Subject: no fuel going to two injectors on 763 Message: I bought a 763 that person said it ran out of fuel. Replaced fuel pickup tube and screen but cannot get fuel to the two middle injectors. Injector pump looks like it is cast as part of motor. Any idea what the problem could be. The injectors on the end seem to be getting fuel. Do not allow replies to this post.
 

Fishfiles

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The message you are replying to: Posted By: Johnboy on 12-04-2013 03:43 PM Subject: no fuel going to two injectors on 763 Message: I bought a 763 that person said it ran out of fuel. Replaced fuel pickup tube and screen but cannot get fuel to the two middle injectors. Injector pump looks like it is cast as part of motor. Any idea what the problem could be. The injectors on the end seem to be getting fuel. Do not allow replies to this post.
The message you are replying to: Posted By: Fishfiles on 12-05-2013 03:33 AM Subject: try this , remove the tubes from all the injector pumps fittings , then loose the two fittings that are not pumping fuel , then pump the primer bulb till fuel flows out the loose fitting , reassembly and try it , there may be water or dirt in those two , i Message: The message you are replying to: Posted By: Johnboy on 12-04-2013 03:43 PM Subject: no fuel going to two injectors on 763 Message: I bought a 763 that person said it ran out of fuel. Replaced fuel pickup tube and screen but cannot get fuel to the two middle injectors. Injector pump looks like it is cast as part of motor. Any idea what the problem could be. The injectors on the end seem to be getting fuel. Do not allow replies to this post. Do not allow replies to this post.
 
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Johnboy

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The message you are replying to: Posted By: Fishfiles on 12-05-2013 03:33 AM Subject: try this , remove the tubes from all the injector pumps fittings , then loose the two fittings that are not pumping fuel , then pump the primer bulb till fuel flows out the loose fitting , reassembly and try it , there may be water or dirt in those two , i Message: The message you are replying to: Posted By: Johnboy on 12-04-2013 03:43 PM Subject: no fuel going to two injectors on 763 Message: I bought a 763 that person said it ran out of fuel. Replaced fuel pickup tube and screen but cannot get fuel to the two middle injectors. Injector pump looks like it is cast as part of motor. Any idea what the problem could be. The injectors on the end seem to be getting fuel. Do not allow replies to this post. Do not allow replies to this post.
Thanks everyone. That is what I was thinkink that center two are either stopped up or stuck up and not pumping. Will dig just a little deeper before carrying it to shop. Thanks
 
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Johnboy

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Thanks everyone. That is what I was thinkink that center two are either stopped up or stuck up and not pumping. Will dig just a little deeper before carrying it to shop. Thanks
I took the four fittings that go to the injector lines off and there is a spring, round bushing with a hole in it, a brass thin washer and a small shaft that goes inside the bushing. One was completely stopped up and stuck and other one was also had trash in it. I pumped the bulb and get fuel at all four holes in the injector pump. I think remember how they go back but has anyone ever had these parts apart before? Also what would be best to soak and clean these parts with, would carb cleaner be OK?
 

antfarmer2

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I took the four fittings that go to the injector lines off and there is a spring, round bushing with a hole in it, a brass thin washer and a small shaft that goes inside the bushing. One was completely stopped up and stuck and other one was also had trash in it. I pumped the bulb and get fuel at all four holes in the injector pump. I think remember how they go back but has anyone ever had these parts apart before? Also what would be best to soak and clean these parts with, would carb cleaner be OK?
If you did what Tazza said and did not go farther carb cleaner and fuel after to lube up should be good to go
 
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Johnboy

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If you did what Tazza said and did not go farther carb cleaner and fuel after to lube up should be good to go
Got all parts soaking overnight in carb cleaner and I blew out the fuel nozzles. I will reassemble tomorrow. I think first installing the round bushing with short shaft then copper washer, spring and fuel nozzle on top. I blew out all lines and vacumned the top opening of the fuel injectors just in case some dirt might be on top. Let me know if this is not the right order. I can look down in injector pump and see the round parts Tazza was talking about. Again thanks everyone for all your help.
 
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Johnboy

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Got all parts soaking overnight in carb cleaner and I blew out the fuel nozzles. I will reassemble tomorrow. I think first installing the round bushing with short shaft then copper washer, spring and fuel nozzle on top. I blew out all lines and vacumned the top opening of the fuel injectors just in case some dirt might be on top. Let me know if this is not the right order. I can look down in injector pump and see the round parts Tazza was talking about. Again thanks everyone for all your help.
Got fuel to injectors and some black smoke but still not running. I am taking injectors out and have them checked since I found so much dirt in check valves. I think some trash got in injectors before stopping up check valves. Does anyone know the correct voltage going to the glow plugs?? Thanks John
 

antfarmer2

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Got fuel to injectors and some black smoke but still not running. I am taking injectors out and have them checked since I found so much dirt in check valves. I think some trash got in injectors before stopping up check valves. Does anyone know the correct voltage going to the glow plugs?? Thanks John
Sound like your on the right track the best way to test glow plugs is to take them out and put on your battery should glow about at least a 1/4" all the way to the tip if any are bad I would replace all so they wear together make sure you clean all contacts good when you put it back together
 

Tazza

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Sound like your on the right track the best way to test glow plugs is to take them out and put on your battery should glow about at least a 1/4" all the way to the tip if any are bad I would replace all so they wear together make sure you clean all contacts good when you put it back together
They will be 12v
You can do a home test to check injectors. I have removed the injectors and tube lines, jung the shortest one from the number 1 injector delivery nozzle and hook up an enjector to the end of it. Crank the engine till it starts to spray. It will show you the spray pattern so you will know if they need cleaning or even plugged up.
I have found injectors can plug up from sitting for some time. You can dismantle them, clean and re-assemble with very good results, i have done it many timee without issues and great end results.
 
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Johnboy

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They will be 12v
You can do a home test to check injectors. I have removed the injectors and tube lines, jung the shortest one from the number 1 injector delivery nozzle and hook up an enjector to the end of it. Crank the engine till it starts to spray. It will show you the spray pattern so you will know if they need cleaning or even plugged up.
I have found injectors can plug up from sitting for some time. You can dismantle them, clean and re-assemble with very good results, i have done it many timee without issues and great end results.
Had two bad injectors and other two stopped up and had to be rebuilt. Hope this corrects problem. Thanks fof all the help.
 
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