+! for starters. You may have other problems, but start here. I think
i found the best deal at autohaus AZ. At least check their shipped price.
Peter Frederick via Mercedes <mailto:mercedes@okiebenz.com>
December 26, 2016 at 2:32 PM
Lift pump is shot, it has a leather seal, and it's leaking air in.
Replace with the new style "thumb" pump, it's internally sealed with
o-rings and will not leak air.
The old one will leak air even if screwed down when the seal fails.
Pretty sure it failed last time the filters were replaced, it's a
common thing.
Won't start or run reliably until you replace and re-prime.
Peter
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Floyd Thursby via Mercedes <mailto:mercedes@okiebenz.com>
December 26, 2016 at 2:09 PM
So the other night (Christmas eve) I had to drive up to Sparkleburg
and fetch the girl because her 300SD was not starting. I had a coupla
hours to kill while she finished work so I fooled around with it in
the dark. She got a new battery as the old one was getting a bit
weak. I put the battery charger on it with the START setting engaged
to get a bit more juice. I cranked on it for 3 or 4 minutes after
glowing 3 times, and after awhile it would catch and run for a coupla
seconds then die. I got to thinking it was a fuel issue, she put in
new filters at the engine so that should be OK. I pumped the primer
several times and noticed 2 things: 1) it was leaking some and 2) it
was kinda weird in that it had a big plastic top, not like the ones
with the little round metal top. I had never used it so never really
noticed it, it must be some aftermarket thing. I did notice a bit of
weeping around a coupla the injectors, might have been coming from the
return lines, I will have to replace those.
Anyway I did that a coupla times, pump, crank, and it would fire for a
bit but then die. There was smoke coming out so I figured it was
getting fuel. After about the fifth or six try it finally lit off and
ran OK but was not idling very well, quite rough, but it kept
running. So that was success. Restarting a coupla times it took
maybe 5 seconds of cranking to get it to light off. So I am thinking
there is more to the issue than whatever was going on in trying to get
it to start.
I had asked about this some time ago, I recall that valves adjustment
would be useful (I have never done it on this car but did on the TD a
coupla times so I know how to do it) and there were some other
suggestions too. Anyone care to recap what I might need to do? She
might be able to bring the car down to me at some point so I can work
on it, I would like to do whatever might get it starting and running
better, get it all done at once. Might the pump be leaking and
getting air in the fuel line?
On another aspect the alternator belts were really loose, I tightened
up the alternator and then it sounded like either the bearings were
going bad or the fan thing on the pulley was scraping and making huge
noise. The alt is maybe 3 years old, a Bosch, so it should be OK.
The pulley seemed tight so I don't know that that is about.
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