I'd try the oring on the fuel filter first, then try replacing every
hose on the suction side from the tank to the transfer pump, and the
transfer pump to the filter. If the line from the filter to the IP
was not replaced, replace that also, along with all 4 aluminum rings.
My guess is the line from the transfer pump to the filter. If these
are 124 300D's then there are the fuel heater lines also.
At 07:01 AM 11/6/2008, you wrote:
It has been rumored that some of the listers have some knowledge
about these cars, below is a question from a very frustrated Ozbenz
member, thought I'd ask here to see if anyone has any further
suggestions, the thread can be viewed here
http://ozbenz.net/viewtopic.php?f=5&t=7299&p=46313#p46313
Hendrik
whose last fuel starvation issue was crap in the pipes
As most of you know, my wife and I have several 300Ds.
My wife's car (Josephine), an '83 300D, has been losing power on the
hill climb which is the highway from town to our home. Normally our
300Ds can manage 80Km/H up this road with no problems.
The car runs well downhill and on level ground, but when it is under
full power for more than a couple of minutes (when hot or cold), it
suffers from fuel starvation.
* As a matter of course, the first thing I have done is to replace
both the fuel filters - no improvement !
* I swapped the fuel supply and return lines to eliminate a blocked
tank strainer issue - no improvement !
* Just to be sure, I have test driven the car using a 10 litre
container of fuel in the passenger's foot well and run the fuel
lines to it, eliminating the fuel lines and hoses to the fuel
tank. - No improvement !
* I have replaced all fuel hoses (some were 10mm where they should
have been 8mm - no improvement !
* I have fitted a fuel pressure gauge, teed into the fuel line from
filter to IP. It maintains a positive pressure at all times,
usually around 0.8 - 1.0 Bar, so I am sure that there is no air
being sucked in, or restriction in the fuel filter, after the fuel
pump !
* When the engine is suffering this issue, if I turn the engine off,
and check the return line for air, it is clear - no air bubbles,
even if I pump the fuel pump a number of times, so it is unlikely
that there is an air leak on the suction side of the fuel pump. I
have also crimped the fuel hose at the fuel tank outlet and
pumped, with no air appearing in the pre-filter or return line,
even after allowing fuel to flow.
* I have swapped the IP (complete with fuel pump) with another from
a spare care I have here - no improvement !
* I have pumped the fuel pump by hand and watched the fuel flow from
each of the banjos (fuel delivery and return) at the IP, with the
bolt loosened and plenty of fuel flows from these locations.
* I have used B100 in the tank with no improvement !
* I have used petroleum diesel (the 10 Litre container held diesel)
with no improvement !
I am fast running out of ideas on this issue.
The engine is suffering from fuel starvation, of that I am sure. I
just don't know why, or where it is happening :?
What have I missed?
Does anyone have a suggestion on what to test for next?
Regards,
Tony
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Loren Faeth
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