CASE-IH fuel problem

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   Friend has a CASE-IH about 25 years old. Front wheel assist , 6 cyl diesel, maybe 80 HP and I think it is a 4230 ???

In the past few months the tractor seems to loose prime to the fuel pump after setting for a  few days. This is a manual shut off tractor. You pull up on a knob to shut off the fuel. I can see the cable and link on the fuel pump move open and close. I don't think the shut off is the problem, but im not sure. It has a plunger primer pump mounted on the tractor frame by the fuel filters. If I pump it 20 times, it will eventually start back up........ is there a check valve leaking off, or does the hand priming overpower a stuck valve...... or ? ......... im open for ideas on where to start.

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steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 86148	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Topic: CASE-IH fuel problem Posted: 10 Mar 2016 at 12:41pm
	Friend has a CASE-IH about 25 years old. Front wheel assist , 6 cyl diesel, maybe 80 HP and I think it is a 4230 ??? In the past few months the tractor seems to loose prime to the fuel pump after setting for a few days. This is a manual shut off tractor. You pull up on a knob to shut off the fuel. I can see the cable and link on the fuel pump move open and close. I don't think the shut off is the problem, but im not sure. It has a plunger primer pump mounted on the tractor frame by the fuel filters. If I pump it 20 times, it will eventually start back up........ is there a check valve leaking off, or does the hand priming overpower a stuck valve...... or ? ......... im open for ideas on where to start.
	Like them all, but love the "B"s.

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DMiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 33302	Post Options Post Reply Quote DMiller Report Post Thanks(0) Quote Reply Posted: 10 Mar 2016 at 12:53pm
	Start by looking to debris screens in the fuel tank outlet, then for hoses or tubing that may have a slight pinhole that will not always weep but will suck air like a braided hydraulic hose. Next look at that priming pump for it may leak around the packing on the plunger and while may re-prime the system could suck air when running. My 180D had a outlet screen in the sediment bowl, was darn near locked tight with crud.

steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 86148	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 10 Mar 2016 at 5:27pm
	I will check the hoses for cracks Dave... im not sure about the pluggage as it runs fine once it starts up. Just seems to run out of fuel after setting a few days. Once primed, it runs fine... I will check for "wetness" on the lines and fittings......... I was hoping there was some "secret" specific to these old CASE-IH motors.
	Like them all, but love the "B"s.

DMiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 33302	Post Options Post Reply Quote DMiller Report Post Thanks(0) Quote Reply Posted: 10 Mar 2016 at 7:33pm
	Should be old standard American Bosch or Roosa system fuel delivery, if it is a Stanadyne/Roosa Master then look for the pump to be failing otherwise welcome to low sulfur diesel issues as we all get to play with.