83 240D stalled and won't restart. ideas? - Page 8 - PeachParts Mercedes-Benz Forum

Brian Carlton · #**106** 04-03-2008, 10:07 AM

Quote:

Originally Posted by Dionysius

Low Pressure Fuel Supply Bleeding Procedure

1. Acquire a jar and place circa one inch of diesel fuel into it.

2. Disconnect the cigar hose from the fuel return line to the tank and seal with finger to prevent air ingress

3. Submerge the hose end into the fuel in the jar and release finger

4. Using hand primer and/or cranking continue until bubble-free flow is established

5. Reconnect the cigar hose to the return line keeping it finger sealed as before

Notes:

a. The Injector Pump (IP) fuel supply line circuit should now be air free.

b. Confirm this by pumping the Primer Pump and listening for the characteristic check valve chatter chirp sound. A vibration at the check valve can also be felt when this sound occurs. If this checks OK then proceed. If not troubleshoot the cause.

I'm not grasping why the hoses need to be disconnected and placed in a jar. The only benefit of this extended procedure is to verify flow without air. The tank can just as well supply fuel and accept return flow..........you just don't know how many times to operate the primer.

funola · #**107** 04-03-2008, 10:53 AM

I agree, besides it's messy. I'd prefer to splice in a short section of clear hose between the filter head and cigar hose. This way you can instantly see if there are bubbles anytime you like.

Quote:

Originally Posted by Brian Carlton

I'm not grasping why the hoses need to be disconnected and placed in a jar. The only benefit of this extended procedure is to verify flow without air. The tank can just as well supply fuel and accept return flow..........you just don't know how many times to operate the primer.

Dionysius · #**108** 04-03-2008, 02:31 PM

Quote:

Originally Posted by Brian Carlton

I'm not grasping why the hoses need to be disconnected and placed in a jar. The only benefit of this extended procedure is to verify flow without air. The tank can just as well supply fuel and accept return flow..........you just don't know how many times to operate the primer.

Brian Funola et al: Thank you for the feedback. This is a method I thought up because a novice (not you guys!!) is more likely to succeed if he/she can positively see air being removed and positively establish when that air removal is completed. It is a single hose clamp screw and very simple.

The contributors to this thread are not in need of this pedagogy however.

Translation: In other words if you know the f**k what you are doing do it your own way but I wrote this for the masses.

Can you see any improvement apart from this to the procedure??? I must have overlooked something. And did anybody find the mythical MB procedure??

P.S. I noticed that the 4-way terminology was used to describe the Union banjo.

Dionysius · #**109** 04-03-2008, 03:10 PM

Quote:

Originally Posted by Brian Carlton

I studied the OM603 manual for some info. This connection is referred to as a "choke orifice" and it's .8mm (.031") in diameter.

Purpose is not stated.

Why would one name something a 'Choke Orifice'. Call the thing a 'Bleed Orifice' if that is what it is.

Get it...... Choke is the opposite of Bleed. Maybe Bleed in German is Choke???

tcaron · #**110** 07-30-2008, 11:59 PM

Is the fuel pump and lift pump one in the same on the 240d?