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Fuel issue has been resolved. The #5 injector seat was leaking by causing the fuel to become aerated. Reseated all the injectors and adjusted the fuel rack. Runs great now.

I've not installed a check valve yet. I'm waiting for the water separator base to come in. Fuel is clean and free of algae. I've pulled the pickup tube as well. No obstructions from the tank to the injector pump. I'll be putting a pressure gauge on it to check the condition of the pressure...

I've replaced all the rubber lines and notice little to no change. I have a new water separator ordered. Local Parker Store told me they couldn't get it.

I'll change all the lines. The supply line appears to be newer than the others but also looks smaller in diameter? What is the correct size supply line? Can't imagine that it should be smaller than the return.

It appears to be. I've also noticed that if it sits for a couple days, it sounds like it's getting some air in the system when I first start it. The primer bulb doesn't feel tight either after it sits.

My M1090 seems to have very low fuel pressure at the IP as it almost stalls under any load. It acts like it just isn't getting enough fuel. I've changed both filters with no change at all. It runs at wide open throttle while sitting still in neutral but as soon as I start to drive it empty, it...