Yes that is correct only the problem started about a year ago. Who
is still looking for rusty lines and leaks in the system.
Mike
On Jun 17, 2010, at 6:39 AM, Dillon, Meade M CIV SPAWARSYSCEN-
ATLANTIC, 53310 wrote:
I don't know of a mechanism that would cause the system to lose prime
when hot but then regain prime after it cooled off. That's not to say
that it doesn't exist, but I'd love to hear how that works.
Let me restate your problem to make sure I understand. 123 turbo
diesel
- OM617.952 engine. Cold engine - fires right up with no priming and
'normal' cranking. Hot engine - no start unless you operate the
priming
pump. Once running there are no other symptoms (power is fine,
mileage
is normal, idle is smooth). History of the problem - it has existed
for
years. Seasonal influence - problem is worse in warm months.
Have I got it right?
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Mike Esh
Sent: Wednesday, June 16, 2010 7:20 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] Hard start problem returns- Update
Steel pipes and car are very good condition with minimal rust.
I checked all connections on filter assembly and made sure all
fittings
had both washers.
O-rings are new on the bolt for the filter. There are two of them,
the
lower one is smaller than the upper one.
I hear nothing when operating pump manually. Could this be allowing
fuel to return when the engine is hot and correct itself as the engine
cools?
No rising oil, I usually add a quart between changes.
Thanks for the input,
Mike
On Jun 16, 2010, at 6:26 PM, Dieselhead wrote:
Assuming that all the steel pipes are not rusted. .. Some fuel
filters have o-rings on the bolt that holds the filter in place,
older
ones have an aluminum seal under the head of the bolt. I think yours
has orings. Maybe someone else can say for sure. Air can leak in at
these orings. Any loose banjo fitting at the filter can leak. The
banjo fittings into the IP and out of the IP can leak. All banjo
fittings are supposed to have an aluminum ring under the bolt head
and
under the fitting. Absence of any aluminum seal ring can allow air
in
the lines.
There is a check valve on the backside of the IP at the exit line
banjo fitting. It is possible somebody removed this. When it is
very
quiet, you can hear the check valve operating when you pump the hand
primer pump.
Do you have a rising oil level? It is possible, but very rare, for
the IP shaft to leak fuel into the crankcase.
I checked/replaced all connections and hoses and cannot determine
where anything is leaking. Everything is dry and clean. I can
actually see the fuel level in the clear filter level drop. I
appears to be draining toward the spin on filter. Is there check
valve somewhere that is allowing the fuel to drain back when it is
hot. Is the injection pump going bad? I am getting so frustrated.
Anyone within 200 miles of Whitehall, MI that has knowledge of how
to
fix the issue? I would be willing to travel to solve this.
Thanks,
Mike
On Jun 11, 2010, at 3:21 PM, John Reames wrote:
Check to see if your vent line is plugged... Either fighting to
pull
the filler cap or hearing air go in.
I had an 84 sd that was taking on air until I blew out the vent
line...
--
John W Reames
jwrea...@comcast.net
Home: +14106646986
Mobile: +14437915905
On Jun 11, 2010, at 14:05, Dieselhead <126die...@gmail.com> wrote:
A stream of bubbles in the clear filter only indicates an air leak
in the suction line. An air leak after the clear filter, in
lines,
transfer pump, filter, IP, or return lines do not indicate by
bubbles in the clear filter. You can use the presence or absence
of bubbles to focus your efforts before, or after the prefilter.
If the hoses are old, OFTEN, there are multiple air leaks. If the
hoses are all less than 2-3 years old, it is likely to be a clamp
that is not tight.
It is a good idea to change all the fuel hoses every 5 years or
so.
(yes the original hoses lasted 10-20 years.) I have not had MB
replacements last that long. FLAPS hose is usually good for 5
years.
I only use OE or OEM radiator hoses. They are still noticeably
better than any third party hoses.
Also note that the hand priming pump only moves fuel into the
injection pump, NOT out the injection lines to the injectors.
You
operate the priming pump about 50 to 70 times to prime the
injection pump; you will know that it is primed when the noise
changes and the pump action firms up.
How does the car run once you get it started? Can you reach top
speed or does it lose power at highway speeds? Watch the clear
in- line filter
- is there a stream of bubbles entering?
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Dieselhead
Sent: Friday, June 11, 2010 12:58 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] Hard start problem returns
Try bleeding the fuel system at the filter (Top bolt, or line
out) while
you pump the primer. It sounds like air is getting into the fuel
system somewhere. A leak at the filter can cause a leak. Bad
copper seals in the delivery valves can cause problems.
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