Posted by JD Seller on December 07, 2015 at 18:48:18 from (208.126.198.123):
I am working on a Willmar Wrangler loader. It has a JD 4239 four cylinder diesel motor in it with a CAV injection pump. It was low on fuel and there is a barrel of diesel fuel, that was drained out of a larger tractor, that we are just hand pumping into the Wranglers, to use up the fuel. The fellow got the wrong barrel and pumped about five gallons of hydraulic fluid into the diesel fuel. It only ran maybe fifty feet when the filter plugged up and killed it.
So we pulled it back into the shop and drained all the mixed fuel out an flushed the fuel tank out real good. Changed the fuel filter and bleed the system. The engine will run for a few minutes and then the filter starts to fill with small air bubbles. It has the square glass Stanadyne filter on it. It will then die and you have to bleed it all over again.
The bottom of the fuel tank is only 12 inches below the transfer pump. The fuel line is only 16 inches long from the tank to the transfer pump. It is just 5/16 rubber line. So while I was cleaning/flushing the fuel tank I replaced the line with a new one. The transfer pump just did not seem to "feel" right when using it to manually bleed the filter. So I replaced it with a new one. I removed the steel line from the pump to the filter base and cleaned/inspected the entire line for holes/cracks on the flanges/line, it is OK. I even replaced the new filter with another one as I have seen the glass ones leak air around the steel base. This did not help it at all. I removed all the fittings in the inlet side of the filter and cleaned them and reinstalled them with tape AND thread paste. Still getting air.
The total fuel system from the tank to the filter base exit is not 24 inches long and 12 inches in elevation. The tank outlet is in the side of the tank about inch from the bottom of the tank. There is not stand pipe on the inside. The tank has 11 inches of clean fuel in it. So the fuel level is about at the height of the filter inlet.
I can not figure out how I am getting air bubbles into the fuel inlet side of the filter. I am about ready to try a small external fuel tank that would be above the whole system. I am just about out of ideas.
PS The return line goes straight to the tank. It does not join the inlet system. I have seem the ones that tee the return and inlet get air through the return side.
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