Keep it simple, would a leaking return line let air into the fuel system?
The correct answer is: Yes.
Air in the fuel lines does not directly keep fuel out of the injector
lines. Air in lines lead to air in the IP. That means air in the
plungers, and that means no fuel is pumped into the injectors lines.
That means no fuel injected. That means that "engine no runny."
The plungers are fed by fuel in the body of the IP. When air in the
system allows fuel to drain back into the tank, the fuel also drains
out of the IP.
Do you notice any difference if the tank is full vs, nearly empty?
One other thing you can do is fill the tank, then pull off the line
TO the clear filter. On an 84 123 sedan, the tank is behind the
seat. Fuel should run out at the prefilter when the tank is full.
It is possible there is some other weird problem, but do check and
eliminate all the simple things first.
Would leaking return lines cause loss of fuel pressure to the
injectors after shutting down the engine?
Mike
On Jun 11, 2010, at 5:02 PM, John Reames wrote:
What does the closing cap for the return lines look like on the
last injector? It's oft neglected, or worse, lost and replaced
with an improper replacement.
You can cut the old hose off the plug and insert it into a new
short piece of hose.
--
John W Reames
jwrea...@comcast.net
Home: +14106646986
Mobile: +14437915905
On Jun 11, 2010, at 15:28, Mike Esh <michael...@me.com> wrote:
Car runs great! Cruises at 75 mph easily. In-line has one small
bubble in it, and it does not seem to be pumping a stream of
bubbles.
Mike
On Jun 11, 2010, at 1:32 PM, Dillon, Meade M CIV
SPAWARSYSCEN-ATLANTIC, 53310 wrote:
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.
If you get air out at the filter, you have a leak. 95% of the time, I
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