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.
_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
