Lift pump

[brooster]

Is there a way to check a lift pump to see if it’s ok? Will filling the bowl with inlet and outlet lines up work?

 

[GreensvilleJay]

hmm, should be able to disconnect the outlet side, plumb into a big pop bottle, turn key to on.....
it should fill the bottle....
be SURE to secure th ebottle BEFORE turning the key on though....

 

[North Idaho Wolfman]

Just temporarily eliminate it and see if you still have a fuel in oil issue.
This can be done on most models of tractors by just keeping the tank full, gavity will do the work.
if the tank level is lower then the injection pump inlet, then just add a low pressure, low flow, electric pump, or bottle / jug feed it from above the the injection pump, you will also need to reroute the return line if you do a jug above the pump or you'll just fill the original tank.
Also note if you leave a jug connected to the injection pump and the level of the jug drops then the injection pump is leaking.

 

[brooster]

hmm, should be able to disconnect the outlet side, plumb into a big pop bottle, turn key to on.....
it should fill the bottle....
be SURE to secure th ebottle BEFORE turning the key on though....

I have the pump off the tractor because I’m getting fuel in the crankcase, I am wanting to find if the diaphragm has failed

 

[North Idaho Wolfman]

I have the pump off the tractor because I’m getting fuel in the crankcase, I am wanting to find if the diaphragm has failed

That's an easy test. Compress the pump with a fuel feeding it and the outlet blocked.
If fuel comes out the wrong places it's bad.

 

[PoTreeBoy]

Assuming, related to your other posts, you're concerned with it leaking into the crankcase; take both hoses off, plug the outlet port, blow into the inlet port (with your mouth, no more than 10 psi), there should be no flow. If you detect leakage or hear any, the diaphragm is leaking.

If the oil level is rising with the engine off, bypass the lift pump with a hose from the separator/filter straight to the injector pump. If the level still rises, the problem is the injector pump, or possibly an injector.

Are you sure this is fuel and not hydraulic oil?

 

[brooster]

Just temporarily eliminate it and see if you still have a fuel in oil issue.
This can be done on most models of tractors by just keeping the tank full, gavity will do the work.
if the tank level is lower then the injection pump inlet, then just add a low pressure, low flow, electric pump, or bottle / jug feed it from above the the injection pump, you will also need to reroute the return line if you do a jug above the pump or you'll just fill the original tank.
Also note if you leave a jug connected to the injection pump and the level of the jug drops then the injection pump is leaking.

So what you are telling me is that if the oil level increases over night just sitting that my injection pump is most likely the culprit for the fuel in my oil

 

[North Idaho Wolfman]

So what you are telling me is that if the oil level increases over night just sitting that my injection pump is most likely the culprit for the fuel in my oil

Yep

 

[brooster]

Assuming, related to your other posts, you're concerned with it leaking into the crankcase; take both hoses off, plug the outlet port, blow into the inlet port (with your mouth, no more than 10 psi), there should be no flow. If you detect leakage or hear any, the diaphragm is leaking.

If the oil level is rising with the engine off, bypass the lift pump with a hose from the separator/filter straight to the injector pump. If the level still rises, the problem is the injector pump, or possibly an injector.

Are you sure this is fuel and not hydraulic oil?

The oil smells of diesel, where would hydraulic fluid get into the crankcase?

 

[brooster]

Yep

Thanks

 

[PoTreeBoy]

The oil smells of diesel, where would hydraulic fluid get into the crankcase?

You probably have an engine-mounted hydraulic pump, which also has a seal. But, assuming you relieve the hydraulic pressure when you shut down and since it smells like diesel, it probably isn't hydraulic oil.

 

[North Idaho Wolfman]

You do know that the oil will always smell like diesel, it's normal.
That's not any indication that you have fuel in the oil.
Is the oil gaining volume significantly?

 

[brooster]

You do know that the oil will always smell like diesel, it's normal.
That's not any indication that you have fuel in the oil.
Is the oil gaining volume significantly?

In the past 2 days after approximately 20 min run time and the sit time the level has increased about 1/4”

 

[PoTreeBoy]

In the past 2 days after approximately 20 min run time and the sit time the level has increased about 1/4”

Did you try bypassing the lift pump? It'll still start and run at low load without the lift pump if you have a fair amount of fuel in the tank.

 

[North Idaho Wolfman]

In the past 2 days after approximately 20 min run time and the sit time the level has increased about 1/4”

Yes like PoTreeBoy said, you need to do it again without the lift pump in the system.