Won't Start or Run Without Injector Pump Bleed

Riddler · Jul 16, 2015

My TN75VA stops running or won't rev past minimum after operating normally for a period (e.g., 30 minutes). Often, just before the engine quits altogether, it suddenly drops rpm to bare minimum and won't respond to movements of the throttle. Then, after the engine dies and won't restart, we often, but not always, can get it running again by disconnecting the feed to one of the injectors while we turn the engine over. However, this last time, disconnecting the injector feed didn't enable the engine to start back up. Instead, I just let the tractor sit for a week and it started back up without disconnecting the injector feed.

It has been suggested to me that intermittent symptoms of the type I am experiencing can arise after the injector pump is exposed to water tainted fuel. I do change the fuel filter from time to time, and the old ones have always been intact following removal.

Anyone else experience similar symptoms? Intermittent problems can be so difficult to diagnose simply because they are intermittent.

TractorTech · Jul 16, 2015

Is the flow from the tank to filter to the injection pump decent? It sounds like something is plugging the line.
Also, is the lift or primer pump pumping?

Riddler · Jul 20, 2015

TractorTech said:
Is the flow from the tank to filter to the injection pump decent? It sounds like something is plugging the line.
Also, is the lift or primer pump pumping?

This weekend, I will check the feed from the tank to the fuel filter bowl to make sure there is no blockage there.

Not familiar with the "lift" or "primer pump" on this model (TC45DA), but I'll take a look at the service manual and do the necessary tests.

Thanks.

jaotguy · Jul 20, 2015

also blow air back from the filter to the tank ... may have some crud in the tank that sloshes around till it finally clogs the fuel pickup ...

not sure , if that unit has a mechanical low pressure pump that feeds fuel to the injector pump ... it may be failing ....

TractorTech · Jul 22, 2015

Riddler said:
This weekend, I will check the feed from the tank to the fuel filter bowl to make sure there is no blockage there.

Not familiar with the "lift" or "primer pump" on this model (TC45DA), but I'll take a look at the service manual and do the necessary tests.

Thanks.

You started the thread with a fuel problem on a TN75V, now you're not sure about a lift pump on a TC45DA. Which one has a fuel problem?