Posted by JDseller on December 02, 2011 at 00:23:24 from (208.126.196.144):
In Reply to: Case 580sk posted by Stage Coach on December 01, 2011 at 22:44:52:
The electric pump in front of the filters will not hurt a thing. Just bypass the mechanical pump. If you leave it in line it can leak and fill the pan with fuel. A big advantage with an electric pump in this way is that it makes bleeding the filters much easier. You just open the bleed screw and turn the key/electric pump on and wait for the air to be pumped out.
I have done this on several different things. The most common was the older Allis-Chalmers end loaders,545s and 645s. They used a Roosamaster injection pump without a separate mechanical fuel pump. The Roosamaster pumps will pump fuel up from lower tank but not very well. So as the injection pumps wore it made bleeding them very hard. Easy solution was just installing an electric pump to push fuel up to the injection pump. Many of the JD Combines(6600,7700,6620,7720,8820) had an electric pump under the fuel tank that pushed the fuel up to the engine. So they can be found used.
Many of the newer tractors have an electric pump to push the fuel to the injection pump. This was before the fuel rail fuel systems.
So to Bob Huntress, I would leave it alone if it is working. There may be a problem in the injection pump that lets things leak off or bleed out. The electric pump pressurizing things would let it still work. Where the mechanical pump may not.
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