So Flu Farm, did you ever chase down that fuel line air leak issue one of your trucks was having? Mine may be coming down with the same bug. I'm waiting for new fuel filters to be delivered before I start troubleshooting.
You might as well start your trouble shooting. In my case I ended up having to change the filter housing anyway - likely because I wasn't the first one to use the bleeder screws excessively.
Anyway, you inspired me to try again. It was a mixed bag.
Fuel gets to the pump, and to the bleeders, but not in massive quantities. It ran great for maybe 20 minutes, played with the loader and backhoe a bit to put some load on the engine, then it started crapping out again.
Tried leaving the electric pump running, not knowing if it lends itself to being in line, but not powered. No difference. If anything, it got worse.
On the positive side, the high idle switch has decided to start working (I don't think it used to). Another odd thing is that it seems like the tool hoses are under pressure whenever the engine is running. One of the QDs leak a bit. The switch is frozen, so while it doesn't give high idle, it might feed the reel.
Looks like I'll have to go through the system, tank to filters, to figure this one out. Put a healthy dose of "miracle additive" in the tank, which has very little fuel in it since I was about to drop it. Hopefully that elixir will break up whatever gunk might be in the system.
Of course, it could be as simple as a kinked hose between the strainer and pump. It has been replaced, but is bundled in with various conduits and not visible for the most part. The low pressure pump I'm using puts out so little that it's hard to find a restriction with it.