Just for grins , try driving it WOT with the fuel cap removed .
If no help , park where you can make a mess and disconnect the fuel feel line and observe how the fuel _GUSHES_ out , it *must* be a strong 7MM stream and make a BIG mess in a matter of seconds else there's a fuel flow problem , could be a stone dented the feed pipe underneath the car .
DO NOT stupidly reverse the feed & return pipes for testing ~ this is how folks ruin the injection pump ( !$!$! ) .
Surging & loosing power @ speed is almost always a fuel supply problem , try some Startron by Starbrite at your local boat store . maybe a full bottle of DIESEL 911 by power Service , at your local BIG RIG Truck Stop .
If you have a translucent intake screen , get ride of it RIGHT NOW ! replace with a clear plastic one , my buddy's 240D lost power like this right after he replaced the intake screen , I looked at it and saw no fault but it's didn't flow enough , he replaced the old clean one and all was well again .
I wanted to test it in my 300D but he was pi$$ed off and so tossed it out in a fit of pique .
I hope this helps .
-Nate
Mark wrote:
>
> My friend has an '85 300SD with about 210K miles. He bought it a year,
> or so, ago and has had a recurring problem that is driving us crazy. We
> went on an 800 mile round trip "adventure" this weekend that allows me
> to share the problem accurately.
>
> Shortly after he bought the car he went on a trip and experienced a loss
> of power which reduced the top speed to ~45 mph. He returned home and
> changed the fuel filters thinking that was the problem. Since we have
> taken a few 400 mile round trips in the car and it would lose power
> intermittently but never limit the speed to less than about 60 mph. He
> discovered that topping the fuel off seemed to help with the problem,
> however, the problem has occurred more and more frequently as time has
> passed. This weekend the problem was so bad that any overpass the car
> would lose power and speed would drop to 40-45 mph and a couple of large
> bridges it would only top them at 15-20 mph. Top speed on level ground
> (I-10 in southern LA and Texas) was 40-45 mph the entire return trip.
> That, my friends, SUCKS! One bridge in LA and one over the Houston ship
> channel, on the return trip, the speedo would barely indicate movement
> (as confirmed by our sight!). Houston to New Orleans is usually a 6 hour
> trip, each way, but we spent 10.5 hours getting there and 12.5-13
> returning. Unacceptable!
>
> We have checked the fuel system from the tank strainer to the injector
> pump and it is not plugged. The car surges at WOT similar to a "hit and
> miss" type engine (see YouTube for example). I suspect the problem is
> the injector pump but do not know of a way to troubleshoot it.
>
> The car is otherwise a beautiful example of a vintage SD and has been
> well cared for it's entire life.
>
> Any suggestions?
>
> Thanks,
>
> Mark in Texas
> --
>
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