Quote:
Originally Posted by phlfly
Same thing pitch black even fuel pure clean is coming out fuel tank. Some components in fuel system might be has leak intake air. May be ALDA?
This is reason I will be installing oil separator later.
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The ALDA works off of the intake manifold pressure. It has no connection to the fuel system other than operating a lever inside the injection pump.
Air in the fuel system will come from leaks, old hoses, or loose clamps. The hard lines under the car are also known to develop pinholes from rust. Be looking mainly on the suction side of the lift pump for air ingress.
Why do you need an oil separator? There's a baffle built into the valve cover that does a pretty good job of separating oil, even if the PCV valve has given up the ghost like mine has. If you're blowing oil out the valve cover, you need to address why, the 603 is a relatively low blow-by engine. Excessive oil in the intake manifold is likely from the turbocharger.