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Case Tractors Discussion Forum
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DB 990

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UP Oliver

09-08-2013 13:25:31




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Hello and thanks to all that have been giving me some help.

If you don't know the story, I have been getting fuel in my engine oil on my DB 990.

I drained all the oil out on Tuesday and did not refill. When I check the drain all I get is engine oil from what I can tell; that stuff is black and doesn't smell for fuel oil at all. I would think I would have some fuel there by now.

I have my lift pump off the tractor but connected and have operated the lever 30+ times and do not have a drop of oil in the can I have underneath.

So before I go at the injection pump, I wonder if anyone can tell me if I would get fuel through the manifold heater, inj. pump, or lift pump only when the tractor is running.

Thanks.

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Bret4207

09-09-2013 04:55:32




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 Re: DB 990 in reply to UP Oliver, 09-08-2013 13:25:31  
Yes, you could. There are vibrations, pressure and vacuum in the engine when it's running that aren't there sitting still.
Too bad you didn't find an easy answer with the lift pump. I think if it was the heater you'd have excess smoke when it was running. I can't think of any way for it to get to the base while running, it's going to go into the cylinders.



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UP Oliver

09-09-2013 15:19:28




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 Re: DB 990 in reply to Bret4207, 09-09-2013 04:55:32  
I took the manifold heater off one more time and stuck my pinky down in there; it got wet with fuel oil. Why it didn't drip into the can I had under it for 24+ hours I don't know.

I contacted a guy that knows way more than me about David Browns and he thinks that is the problem.

I will find out here in the next week and half or so. I'm going to block that thing off (I have never used it anyway; have a block heater) and put new oil in and see how it reads as I do some field work.

Thanks for the response.

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