Quote:
Originally posted by P.E.Haiges
SNIP
Also, the IP does not get air bound. The over flow is at the top of the IP and any air goes out there and back to the fuel tank as long as fuel is being pumped to the IP. Any air in the lines goes out the bleeder hole in the in the top of the secondary fuel filter. If the hole in the fuel line is so large that air is sucked in by the fuel pump instead of fuel, then fuel starvation to the fuel pump is the problem.
P E H
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I have had a situation where the IP had air in it, and despite operating the primer pump more than 100 times, and cranking for extended periods, could not get it to fire. I loosened the banjo bolt at the IP "fuel in" line and operated the priming pump until air stopped coming out (about 5 - 10 times IIRC). I then tightened the banjo bolt and the engine started normally.
I called this "air bound", as fuel was not being delivered to the injectors because of the air in the IP. It may have a more correct name, but this was caused by air getting into the IP, nothing else.
I know several 300D drivers who also state that when air gets into the IP, you then need to bleed it manually.