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900B Fuel Problem

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caseman-d

06-22-2003 03:32:51




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Getting no fuel to the final fuel filter. It ran good when I parked it about 3 months ago.

Here is what I know of the tractor. I was told that you could crank on it all day and it wouldn't start on it's own, if you pulled it 10 feet it would run great. The tractor had set for 2 years and when we went to start it we pulled it about 50 feet and it started. The tractor would only run at a very high idle. After I got the tractor home it still ran at a high rpm no matter where the throttle was set. After it run a bit the muffler turned instant red and it started to slowly lose it's rpm till it died. I pulled started it and after awhile it started to run great and then thats when I parked it. I did shut it off by moving the throttle to the off position. Now it will not run again.

I had the fuel tank off to change a frost plug on the head. After I put fuel back in the tank I let the fuel run out to the primary filter to eliminate air. I tried to start it but no smoke. That was a week ago, I went back this weekend and tryed either on it and it would run on either but then die. I checked for fuel at the final fuel filter and was not getting fuel to the pump so I thought that was the problem. I decided to check all the filter. I cleaned the primary (it has the washable one), then the secondary filter was terrible so I just removed it and put in a new final fuel filter. When I put the filter housings on I put clean fuel in them with clean fuel. I even filled the final fuel filter. After doing all that I pulled the tractor around for about an half hour and still no smoke.

After all that I started to trouble shoot my problem. I took fuel lines off and blew through them checking for blockage. I seem to have fuel past the secondary filter but not up to the final filter. When I remove the bleed screw at the secondary filter I have fuel and then when I crank the engine it increases the flow but not by much and it never reaches the final filter. I pulled the cover off the lift pump and everyting looked good there. When I turn the fuel on it gets fuel to the pump. The pump turns when cranking the engine, applied light pressure to gears and they seem good. I have had all the injector lines cracked loose at the injectors and no fuel.

The pump is the rotary American Bosch PSB type. I got to thinking on the way home that maybe when I shut the tractor off a couple months ago that what ever shuts the fuel off is stuck? How does a person check this? Would not having a fuel filter in the secondary housing cause the problem? I never checked the fuel pressure at the secondary filter but know it's not much. Throttle seems to work alright, nothing really seems sticky. The fuel was old but it has new fuel in it now. I do have another pump off a Case 500 or would I be better off taking the inline pump off my stuck 900B. Would appreciate any solutions on this. Thanks in advance
caseman-d

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Kelly

06-29-2003 23:08:03




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 Re: 900B Fuel Problem in reply to caseman-d, 06-22-2003 03:32:51  
My 500 did a similer thing when I got it. It sat for some years and the fuel shut off mecehnism was froze up. Pulled the side cover off the shut down and used some Kroil on it. Runs like a champ now.



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laipuller45

06-23-2003 09:50:03




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 Re: 900B Fuel Problem in reply to caseman-d, 06-22-2003 03:32:51  
i have another bosch psb mystery on my 500. getting fuel pressure into the head of the pump and pressure on the return side of the head, but nothing into the distrubution ports...I have tried bleeding the whole thing and still nothing.. any ideas????? i am at a loss on this one.



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RobertTX

06-23-2003 05:29:26




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 Re: 900B Fuel Problem in reply to caseman-d, 06-22-2003 03:32:51  
When I first got my 500, it acted similar to yours. I ran clean fuel with one of the cleaner additives through it, that seemed to help very much, the more I ran it, the less problems I had. I decided that the shut off mechansm in the pump was sticking. Someone has posted about this before, and I believe they did find the shut off to be the problem. Good luck, that system with all the filters, pump bypass, and lines can be frustrating.

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Pat T

06-22-2003 06:06:23




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 Re: 900B Fuel Problem in reply to caseman-d, 06-22-2003 03:32:51  
I'd try checking the line between the 2nd and 3rd fuel filter. Don't know about the 900B, but on the 400 there is a relief valve on the outlet of the 2nd stage filter to return fuel to the tank if the third filter gets plugged, could be stuck open. Stale fuel that's been sitting in the lines and tank get that algae in everything from water and really gum up the works. You might need to flush the whole fuel system with a biocide and change the filters again.

Pat

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