International B275

[TractorTroy]

International B275 diesel will run for an hour or so and then die requiring me to bleed the fuel system so it will start. I've replaced the fuel filter and the fuel tap bowl assembly because the old one was leaking badly where the bowl seats to the fuel tap. I was unable to find a rubber seal to fit the old one so I bought a new fuel tap assembly from tractor supply. The one I bought was not for a B275 but was for an international tractor and screwed in perfectly without modifications. What I noticed after I installed the new fuel tap was fuel would not flow into the glass bowl if the glass bowl was attached and the peacock opened but when I removed the bowl fuel would flow freely. Is that normal? The bowl stays full of fuel at all times either with the engine running or not. I assume that the fuel bowl is staying full due to the small fuel priming pump attached to the engine block. When I do prime the fuel system after it dies there are air bubbles. I assume air is getting into the fuel system somewhere or is an air lock occurring because of the new fuel tap assembly not allowing the free flow of fuel? Thanks in advance for your help.

 

[Janicholson]

The fuel delivery components to the priming pump, should be free of air leaks. Though they should be under only the tanks gravity related pressure, If the issue started after replacing the sediment bowl, I would start there. The lack of filling is usually an indication of no leaks from there toward the pump. Air is trapped. Was the threaded fitting into the takn clean when the new part was inserted? Jim

 

[TractorTroy]

First thank you for your prompt reply. It's been giving me fuel problems before I installed the new fuel tap assembly. I unscrewed the fuel tap assembly and it had rust flakes stopping up the fuel entry hole. I thought I had cleaned the tank well but obviously I had not. I'm going to refill the tank with fresh fuel and see how it runs. Again I thank you for your help you guys are great!

 

[Janicholson]

If the filter assembly Oring is leaking, it can also suck air. Some filters need to have the Oring removed by surgery with a dental pik. Jim

 

[JimB2]

Hi Troy, been there many years ago. Had a similar problem on a B414D which has the same fuel system as B275. Does the engine start to surge before it dies or if you pull the throttle open it only runs at idle?
You have to determine if problem is before or after the lift/primer pump.
First try try loosen the fuel tank filler cap just in case the air hole is plugged in the cap.
Next with a clean bucket remove the line from the fuel tank at the input to lift pump and let drain into bucket. The fuel should flow in a steady stream. Be careful not to lose the brass washers on the banjo bolts. Also check the banjo bolts that the center and the cross holes are not plugged. Work forward from lift pump.
In our case it was a small strip of rubber probably from inside of filler hose from the bulk tank that was inside on of those banjor bolts and every once in a while it would block the holes and stop fuel flow.

Good luck
JimB

 

[TractorTroy]

It runs fine at first startup for about an hour then it starts to "miss" then when you pull the throttle open speed does not increase and it will die. I unscrewed the fuel tap assembly from the tank and their was some junk plugging the hole. When I unscrewed the fuel tap with the fuel cap still on the tank the fuel gushed out. When I looked in the fuel tap threaded end that screws into the tank I saw a rather large flake of what appeared to be rust or scale. I thought I had cleaned it fairly well a while back but I guess I didn't get it all. Anyway I'm going to put in fresh fuel and try again. Thank you for the quick response.

 

[TractorTroy]

I had some difficulty removing the o ring it was stuck tight.