TheIglu
Bronze Member
- Joined
- May 9, 2008
- Messages
- 77
- Location
- Royalston, MA
- Tractor
- 1962 IH B414 Diesel, 2008 Kubota B2620
So, she's a diesel. Yes, the wonderfully simple and easy to rebuild/tune CAV injector pump. :laughing:
Issues started last winter. She wouldn't fire. Glow plugs are happy, fuel is getting to the fuel filter without a problem. I've had luck before after pulling the fuel line from the first (front) injector, turning it over a few times to purge out the air, then firing it up. She runs happy.
Let it sit a few days, go to fire it up, she'll fire and run, then either die out or die as soon as I back off the throttle. It's like something is sticking inside the CAV pump or letting air in.
Is there a one way inlet valve on the fuel intake side of the CAV pump? It looks like it could have one, but I can't really tell from then drawings here on page two: http://l-36.com/manuals/CAV-DPA-Pump-Rebuild-Manual.pdf
I opened the top cover of the CAV pump expecting to find tons of grud/gum/baddies in there like so many others have experienced. Nope. Clean fuel. Clean parts. Spotless in there. Put the cover back on and ran out of juice from the battery to prime it.
So, that being said, before I head back out to try it again, anything I should be checking? Should I open up that inlet passage and see how things are looking in there? I imagine the whole pump is lubricated by the diesel fuel so I can only assume a small particulate is causing a clog if that's the case, or there is a seal gone that allows air in or a back-flow situation.
Finally, if one of my injectors is sticking open or mid-open, could that allow fuel to siphon back to the tank via the return line, allowing air into the system? I opened up one injector and gave it a good cleaning. It looked decent in there.
Issues started last winter. She wouldn't fire. Glow plugs are happy, fuel is getting to the fuel filter without a problem. I've had luck before after pulling the fuel line from the first (front) injector, turning it over a few times to purge out the air, then firing it up. She runs happy.
Let it sit a few days, go to fire it up, she'll fire and run, then either die out or die as soon as I back off the throttle. It's like something is sticking inside the CAV pump or letting air in.
Is there a one way inlet valve on the fuel intake side of the CAV pump? It looks like it could have one, but I can't really tell from then drawings here on page two: http://l-36.com/manuals/CAV-DPA-Pump-Rebuild-Manual.pdf
I opened the top cover of the CAV pump expecting to find tons of grud/gum/baddies in there like so many others have experienced. Nope. Clean fuel. Clean parts. Spotless in there. Put the cover back on and ran out of juice from the battery to prime it.
So, that being said, before I head back out to try it again, anything I should be checking? Should I open up that inlet passage and see how things are looking in there? I imagine the whole pump is lubricated by the diesel fuel so I can only assume a small particulate is causing a clog if that's the case, or there is a seal gone that allows air in or a back-flow situation.
Finally, if one of my injectors is sticking open or mid-open, could that allow fuel to siphon back to the tank via the return line, allowing air into the system? I opened up one injector and gave it a good cleaning. It looked decent in there.
