TC-30 Fuel Flow problem

   / TC-30 Fuel Flow problem #11  
I'm the original poster, and i never did fix this problem. This tractor is only used in the summer.

Problem still exists heres what ive done

1) removed sediment bowl, cleaned it out, put in new filter
2) blew compressed air up the flexible hose to the tank
3) confirmed fuel flow from tank to flexible hose is rather fast.....
4) confirmed that with sediment bowl removed, and valve is in ope, there is a steady flow of fuel, it seems slow, its a very light trickle....
5) confirmed that the air vent at the top of the sediment bowl/fuel shutoff valve is clear.
6) blew air from the tank side of the sediment bowl (intake side) to make sure its clear

To recap, if im in low i dont have any problems. If Im in med with PTO or in high with or without PTO, eventually the fuel level in the sediment bowl will slowly drop depending on throttle, until the engine starves fuel, then of course it may start, or i may have to bleed the system.

In high i can reproduce the problem by driving at full speed, full throttle for about 100 yards and then slow down to look at the level of fuel in the sediment bowl.

I'm now thinking the problem is in the sediment bowl/shutoff valve?

What is the screw (rusted) thats on the top of the sediment bowl directly over the shutoff valve?

Mark

Mark,

Have you checked the gravity flow from discharge of sediment bowl to pump intake? It appears the fuel pump is doing what it should and there exist some restriction in the intake side not allow full flow. I had a bit similar situation where a piece do rubber from, the cap partially blocked the valve port, as the result tractor idled just fine but if I gave it a bit more gas it then it hesitated and would go faster.

JC,
 
   / TC-30 Fuel Flow problem
  • Thread Starter
#12  
JC,
Well theres no fuel pump on this tractor, its all gravity feed i believe. The sediment bowl has three hoses, one to the injectors, one to the fuel tank, and a vertical one that looks like an air vent hose. doesnt look like any of these are clogged. I can easily bleed air out of the system until the sediment bowl is full of fuel, but a 'high fuel use" the fuel level drops. I wonder if it may truely be a vacuum situation pulling air in, I thought i tried with the fuel cap off. Either way ive learned alot about this tractor.
 
   / TC-30 Fuel Flow problem #13  
Have you tried removing the fuel cap/? It may be plugged causing the drop in sediment bowl.
I would run hose from tank to injectors direct and see if problem goes away.
Make sure you have no air leaks at all fittings.
 
   / TC-30 Fuel Flow problem #14  
JC,
Well theres no fuel pump on this tractor, its all gravity feed i believe. The sediment bowl has three hoses, one to the injectors, one to the fuel tank, and a vertical one that looks like an air vent hose. doesnt look like any of these are clogged. I can easily bleed air out of the system until the sediment bowl is full of fuel, but a 'high fuel use" the fuel level drops. I wonder if it may truely be a vacuum situation pulling air in, I thought i tried with the fuel cap off. Either way ive learned alot about this tractor.


Mark,

How could you not have a fuel pump? If your tractor is a TC-30 and for sure diesel then you have a fuel pump. The fuel is not lifted in to the injection pump but it is available to pump inlet by gravity.

JC,
 
   / TC-30 Fuel Flow problem #15  
"I'm the original poster, and i never did fix this problem. This tractor is only used in the summer.

Problem still exists heres what ive done

1) removed sediment bowl, cleaned it out, put in new filter
2) blew compressed air up the flexible hose to the tank
3) confirmed fuel flow from tank to flexible hose is rather fast.....
4) confirmed that with sediment bowl removed, and valve is in ope, there is a steady flow of fuel, it seems slow, its a very light trickle....
5) confirmed that the air vent at the top of the sediment bowl/fuel shutoff valve is clear.
6) blew air from the tank side of the sediment bowl (intake side) to make sure its clear

To recap, if im in low i dont have any problems. If Im in med with PTO or in high with or without PTO, eventually the fuel level in the sediment bowl will slowly drop depending on throttle, until the engine starves fuel, then of course it may start, or i may have to bleed the system.

In high i can reproduce the problem by driving at full speed, full throttle for about 100 yards and then slow down to look at the level of fuel in the sediment bowl.

I'm now thinking the problem is in the sediment bowl/shutoff valve?

What is the screw (rusted) thats on the top of the sediment bowl directly over the shutoff valve?

Mark "

I think your #3 rules out the fuel cap.
Looks like #4 is your problem.
I believe that your shut off valve is restricted. And I think that (rusted) screw is the stop for your shut off. I would take that assembly apart and clean it.

The TC30 has an injection pump but not a fuel pump, not quite sure what JC was explaining. But it is Sat. night after watching Arizona lose to Uconn, nothing makes sense.........
 
   / TC-30 Fuel Flow problem #16  
Fuel pump and fuel injection pumps are both pumps. Fuel injection pump can develop much more pressure that let's just say automotive fuel pump for an engine with carburetor. All I'm saying if OP has good fuel flow to inlet of the pump, part #13 or pump inlet. if there is restriction between the fuel bowl and inlet to the pump can cause fuel starvation to the pump or fuel pump can not suck fuel as much as it is able to discharge.

JC,
 

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   / TC-30 Fuel Flow problem #17  
I'm the original poster, and i never did fix this problem. This tractor is only used in the summer.

Problem still exists heres what ive done

1) removed sediment bowl, cleaned it out, put in new filter
2) blew compressed air up the flexible hose to the tank
3) confirmed fuel flow from tank to flexible hose is rather fast.....
4) confirmed that with sediment bowl removed, and valve is in ope, there is a steady flow of fuel, it seems slow, its a very light trickle....
5) confirmed that the air vent at the top of the sediment bowl/fuel shutoff valve is clear.
6) blew air from the tank side of the sediment bowl (intake side) to make sure its clear

To recap, if im in low i dont have any problems. If Im in med with PTO or in high with or without PTO, eventually the fuel level in the sediment bowl will slowly drop depending on throttle, until the engine starves fuel, then of course it may start, or i may have to bleed the system.

In high i can reproduce the problem by driving at full speed, full throttle for about 100 yards and then slow down to look at the level of fuel in the sediment bowl.

I'm now thinking the problem is in the sediment bowl/shutoff valve?

What is the screw (rusted) thats on the top of the sediment bowl directly over the shutoff valve?

Mark

Is the tank vented through the fuel cap or otherwise? Make sure the tank vent is clear.

What's your fuel delivery system look like? Is it tank to tank valve to hose to sediment bowl/filter to injector pump?
 

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