[AT] Case diesel

[drupert at seanet.com]

Just an off-the-wall thought/suggestion -

Does the fuel system on this tractor have a low pressure pump between the
fuel tank and the fuel filter?

The reason I ask is this.  A certified technician and I (well OK the
technician) changed the fuel filter on my Dodge Cummings engine. 
Afterward we couldn't get it started.  Very quickly he realized/discovered
the low pressure pump was not working.  Apparently the high
pressure/injector pump on this engine is not very good at sucking/creating
a vacuum to draw in sufficient fuel under sufficient pressure to the high
pressure pump even though the filter housing appeared to be full of fuel. 
The technician immediately stuck an air hose (with the right pressure)
into the fuel tank though a large rubber gasket and with a couple of ten
second bursts on the starter we had it running fine -

As I say just an off-the-wall thought -

Dudley



> Case diesel guys--I need some help!
>
> I'm working on a Case 431 (I think) tractor with a Roosa Master model DB
> fuel injector pump. According to the service manual it is a 188 series
> engine. The owner changed the fuel filter (aftermarket) and now it won't
> run. It will crank on starting fluid (we are not using the glow plugs, he
> never has in the 17 years he has owned it) but that is it. I am assuming
> an air-lock. There is a good supply of fuel going to the filter. When I
> open the supply line at the pump there appears to be a reasonable supply
> of fuel there also. I can't figure out where to bleed the pump itself. He
> has a Case IH service manual and it mentions nothing about bleeding the
> fuel system other than at the filter. I've checked and have nothing coming
> out of the bypass line from the pump to the tank. I have noticed a pretty
> substantial leak around the throttle shaft on the pump, wouldn't that
> indicate its pumping? Any ideas?
>
> John Hall
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