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Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 26026
Experience:  Technician turned service manager on multiple lines of trucks and engines, used in industry.
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I have an international diesel tractor it will run fine 2

Customer Question

i have an international diesel tractor it will run fine for about 2 hours then it runs rough at high throttle
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Curtis B. replied 1 year ago.

Check the fuel supply from the tank to the injection pump.

Expert:  Curtis B. replied 1 year ago.

The engine seems to be starving for fuel.

Customer: replied 1 year ago.
i checked the fuel lines and looks like the pump is geting fuel
Expert:  Curtis B. replied 1 year ago.

I think you have restriction at the tank, as this is gravity flow system, and the most likley p;ace is where the fuel shutoff valve screws into the tank! I would remove it and clean tank and v;ave.

Customer: replied 1 year ago.
ok i checked the valves thay were fine but i unscrewed the fuel line at the tank that runs to the pump and no fuel came out. so i cranked the tractor and let run while i unscrewed the fuel line just a little bit and fuel was coming out.
Expert:  Curtis B. replied 1 year ago.

No fuel coming out the fuel valve from tank? Fuel should be free flowing.???

Customer: replied 1 year ago.
but fuel flows ween tractor is running. which is kinda weird.
Expert:  Curtis B. replied 1 year ago.

Did you remove the fuel valve from the tank?

Customer: replied 1 year ago.
no it does,int have a valve its just run straight in the tank
Expert:  Curtis B. replied 1 year ago.

Is there a screw in fitting in the tank that line attaches to?

Expert:  Curtis B. replied 1 year ago.

Parts book showed a valve with screen screwed into the tank.

Customer: replied 1 year ago.
there is a fitting but no valve.
Expert:  Curtis B. replied 1 year ago.

Remove the fitting, and see if it has a screen on it.

Customer: replied 1 year ago.
i removed the fitting no screen. so i drained the fuel tank also i removed an injector and the end is covered in black soot the injectors are brand! new also i forgot to tell you that ween tractor runs rough it blows lots of smoke.
Expert:  Curtis B. replied 1 year ago.

oK, so we know tank is clean! How is the air cleaner? Oil bath, does it run any better with air cleaner disconnected?

Customer: replied 1 year ago.
the air filter is ok i just replaced it. i don,t know how it does with the air filter off cause like i said it only runs rough sometimes.
Expert:  Curtis B. replied 1 year ago.

Did you find any debris in tank?

Expert:  Curtis B. replied 1 year ago.

Intermittent running bad, always seems to be fuel.