CAS Fuel Injection Pump Does Not Prime

My tractor is a 1986 Ford 2810 Type 1 Diesel:

I finally have leaks sealed good enough to where the pump should be priming, no excuses. The fuel pump has been bled properly and has good flow, not voracious, but good enough. The fuel filter has also been previously bled, and the fuel shutoff valve is wide open. So, there should be nothing preventing the pump from priming the fuel injection lines, but it won't.

To further diagnose the issue, I attached my vacuum test kit with bleed adapters to one of the lines leading from the pump to the fuel injectors in an attempt to manually bleed the line of residual air pockets. I pumped and pumped while the pressure kept building and building, finally before maxing out my hand pump, I stopped. The vacuum pressure held, which is a good thing if the ability to form a vacuum was the objective, but it is not. The vacuum should have pulled all the excess air from the line, and then continue to fill the bleed kit bottle with diesel. This did not change at all when I began to turn the engine over, which in turn, should have turned the pump on and begin to pump fuel through the lines.

This has me quite stumped. The pump should be building up pressure inside those lines, especially when the engine is cranking. It should not possess the ability to maintain a vacuum during that state.

Just if anyone asks, every fuel line has been removed and checked for clogs, and are clean.

This post was edited by Midnight_Gardener on 08/28/2021 at 06:10 pm.
 
I completely forgot to indicate my tractor is a [b:df0e941c97][u:df0e941c97]1986 Ford 2810 Type 1 Diesel[/u:df0e941c97][/b:df0e941c97].

-------

28 views and no replies...scary...[/u]
 
(quoted from post at 20:27:41 08/28/21) The CAV DPA injection pump does NOT prime that way at all. You probably have a metering valve stuck closed, or stuck rotor plungers, or both..

The metering valve was checked a few days ago, and reconnected in order to ensure the shutoff bar was attached correctly. It appears that the plunger is the most highly probable to get stuck. Either way, it appears I need to remove the pump from the tractor. Disassemble the pump, clean it thoroughly, and then check out the plungers.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top