if your tank is full or at least above 1/2, you can reverse the fuel supply lines, and blow out the tank screen while drawing fuel from the tank return line. if that fixes the car, you've solved the issue. if it makes no difference, try driving with the fuel cap off. if THAT solves the issue, then your vent tube is blocked.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Interesting. I will check that out.

Thanks
Mark

Bustedbenz no dial I guess it was reserved for the turbo motors.

OK a little update after speaking with Gus Pfister at Pacific Fuel Injection in California it was determined that why the performance of my diesel is so lackluster is that it is not getting enough fuel. As i mentioned the PO had the pump rebuilt but upon install I don't think it was set up properly. The full load adjustment screw (behind the plate at the the back of the injection pump) needs to be backed out to increase the fuel flow.

With the car in neutral if I punch I don't get much smoke at all.

Any input as to the easiest way to get to it short of pulling the pump would be appreciated.

Mark

First off, great thread, the first one I have seen on the NA 603 motor besides a few I posted on the hydraulic lifters a few years back.

While these motors are definitely not "power houses", they certainly have more than adequate power at highway speeds. Mine will easily cruise at 70 mph and maintain speed up steep grades. I also have plenty of power to accelerate to extra legal speeds - 90+ if I'm feeling frisky. It feels like it could pull beyond 100 but I haven't tried it because the RPMs are pretty high. The only time I wish I had more power is in the 30 - 50 MPH range where the gearing is less than desireable.

Please keep us updated. I would love to hear about any power mods for this motor.

__________________
Mike

82 Spider
86 560SL (For Sale)
87 CX25 TRD Turbo 2
89 Milano Verde
89 Mondial t Coupe
92 300D
94 E420

Well I addressed the entire fuel system today.
1. Changed out the filters.
2. Blew at 10psi compressed air back through the fuel inline to clear the screen. This is a temporary fix to see is the screen had some algae growing that is hindering flow. (thanks VSTECH for pointing me in this direction.)
3. Replaced the return lines, as they were old and weeping.
4. I took the end plate off the FI pump and adjusted the lower left fuel enrichment screw. You unlock the 10mm nut then back out the screw. Run the engine with the plate off. (yes there will be some engine oil that will come out) and keep adjusting till you start to get the over-rich black exhaust. Then back in the screw a bit till there is minimal smoke. Then lock down the securing nut, put the plate back on and off you go. I have attached a photo that I borrowed from another poster.
5. Additionally I took out my fuel sender and went fishing in the tank for possible algae blooms. None were to be found.

I took it for a test drive and definitely noticed an increase in power.
One more added bonus to the FI pump adjustment: the engine has, since I bought it idled at 500 rpm. Now it idles at what the factory calls for 750 rpm.

Thanks all for the assistance/input.
Mark

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