gimmodog
Silver Member
- Joined
- Jul 18, 2010
- Messages
- 204
- Location
- Southville, Ky
- Tractor
- JD 316, JD 332, JD 430, JD 4200, 2-JD 4300, JD 4720 w/cab, Ford LGT16D
My JD 4200 has sat for a couple of yrs and now when I tried starting it it has no fuel coming out of the injector pump. It ran fine when I parked it. It has the Yanmar 3TNE78A-JT42 3 cyl engine. I do not think this is an air problem. I have installed an electric fuel pump so I know it is getting good fuel pressure to the injector pump without air and it is a self priming engine (which I know works because I have ran it out of fuel before and it primed itself). I took off the shutoff solenoid and found that the lever it controls inside the injector pump only moves maybe 1/16". Since I also have a running JD 4300 I took the solenoid off it to compare and the lever on it moved about 1/4". The 4300 would run with the shutoff solenoid off but this one (the 4200) will still not get any fuel out of the injector pump (the lines to the injectors have been removed for troubleshooting). would anyone know if 1/16" movement is enough to open the fuel shutoff inside the pump. I have read somewhere in my research about delivery valves possibly being clogged. I am assuming that these are the top section where the injector lines connect (the grey area of the picture of the top). My question about the delivery valves is "are they removable without causing any problems" in order make sure they are clean and operable. I did fill the delivery valves orifices with a diesel supplement and it did NOT drain down so I am assuming all 3 are in the closed position (again I assume they open and close), also there was no fuel in the lines to the injectors when I removed them. Other than air in lines this is the first problem I have had with fuel delivery therefore I am a novice with injector pump problems. There is what looks like a cover on the side of the pump that I am not sure if I should remove to have a look inside or not. Is it ok to remove this cover to get a view of the inside? I have attached pics of the pump. Any help would be appreciated.