Quote:
Originally Posted by Tubularfab
How much flow and pressure should I have at cranking speed? Is there an inlet screen in the injection pump itself?
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The fuel should kind of burble out. It's pretty low pressure, you can hold it back with your finger, it's only a spring pushing out the fuel. No inlet screen that I know of.
Quote:
Originally Posted by Tubularfab
In extreme air bubble problems are there any last resorts? Is there any kind of bleed screw to get air out of the pump itself? What next?
Thank you!
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No air bleed screw. Best thing I did for mine was to replace all the O-rings. I'm not sure what else you can do. Generally, if you see bubbles moving through the fuel lines, you can press down on the connections that are upstream of the bubbles and sometimes you can see them quit or at least diminish.
One thought occurred to me today on the way home. Have you verified the glow plug operation? I know these engines really depend on the glow plugs, even when it's warmer outside.
Finally, the next thing I'd do is remove the side cover and visually verify the motion of the rack. You can literally take your finger and hold it wide open (forward) and see if it purges any air out of the injectors while cranking. You can use your finger to keep it running if it starts and once it settles down, you can release the rack and the computer will take over.
The computer sends a square wave signal to the rack electro magnet and that's what pushes the rack forward. A spring pushes it back. If you move it with your finger, you'll feel the computer fighting with you a little but it can't hurt you beyond maybe a little pinch of the finger tip.
