In follow up to the long saga regarding my fuel starved 84 300TD wagon....and after a stint in a local garage, which didn't fix the problem. I just cant figure it out. No need to go into the long details....at this point, the crux of the problem is that the car behaves as if fuel starved. Both filters are new. As the car is running, when viewing the fuel flow through the small initial filter (the little one just before the fuel pump) fuel flows through slowly, even when revving the engine. Then the filter will fill up as it should, with only a normal little bubble at the top, then again it will draw down, and bubbles come in from the fuel supply line.....this happens every several seconds.....the net result is a lot of air going into the secondary filter. If I drive it like this, it will start to stall, as if not able to get fuel.

This morning I drained the fuel tank and removed the strainer....no fungus buildup at all. With the tank empty, I used a compressor and blew out the fuel supply and return lines from the engine compartment. No apparrent blockage. Everything seemed fine.

Then, since I had every thing disconnected, I ran the engine with fuel from a jar in the engine compartment, with supply and return hoses in the jar....when running like this, the engine ran great, with fuel gushing through the little filter as it is supposed to do. I then ran a can of diesel purge full strength, since I had everything set up for it. The diesel purge ran very clean, just gushing through the lines, as it should.

So then I re-connected all fuel lines, put 5 gallons of fuel back into the tank, started her up, and the same old thing happens....air bubbles from the fuel supply line, and fuel barely coming in from the supply line. I haven't checked the tank vent, but the same thing happens when the fuel filler cap is off.

I will now go out and check the entire length of the fuel supply line for sources of air coming in....but there are no fuel leaks, and this is actually a New Mexico car with no rust, very clean, so I dont expect to find rusty fuel lines.

Any other suggestions????? I just cant figure it out.

Thanks

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)