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The fuel shut off should be very easy to push back and fourth. There should be no resistance.

I assume you tried all the easy stuff first and are getting plenty of fuel to the HH, but no fuel pumping out. I'm probably not the best one to answer this as I've only pulled the HH once due to a cracked HH. I did nothing other than swap the HH. I didn't look at any maintenance books. I just...

Hey now.... I never said that the fuel couldn't bypass. The fact is that the secondary filter when they become clogged, fuel will bypass the filters and return to the tank. That is all I was trying to point out.

Good point. There should be excess fuel returning to the tank.

FYI, here is shomething you should check. There is an easy way to prevent run-away diesel. Make sure that the fuel shutoff is actually working to shut OFF the fuel. I do this every time I have to install an injection pump. I do this by spinning the engine over without the injection lines on and...

I doubt that there is a problem with the IP HH. Most likely the fuel is not getting to the IP because the fuel shutoff lever is stuck or a filter is clogged. The fuel shutoff can be checked in a couple minutes. If the tank is too low, you can be sucking air and not getting enough fuel pressure...