[W126 Coupe] no fuel flow

[Dick Spellman]

Here is the image from the cd manual 07.3-269through 285.  You may be 
right in just buttoning things up and seeing what happens.  The pump 
system will have little to do with the previous fuel dump issue I would 
think.  I would change the filter and crush washers for good measure.  
Far more likely that the original fuel regulator, fuel distributor or 
cold start valve (or temp sensor that switches this on/off) were faulty 
in some way.  If you have all fresh cis gear then you should be okay.

fingers crossed.....

Dick

 




The check is in the pump and connects to the metal line running between 
pump, filter and accumulator.

Markus Meyer wrote:

> Actually now that I think of it, I believe the line from regulator to 

> fuel cooler is connected.  But yes, I could still be sucking air, 

> since the engine was disconnected for a while in the car I got it out 

> of, and the lines in the car were disconnected as well.  Maybe I 

> should just hook it all up and see what happens??

>

> Markus Meyer

> mfm at meyerprobateproperties.com <mailto:mfm at meyerprobateproperties.com>

> www.meyerprobateproperties.com <http://www.meyerprobateproperties.com/>

> Meyer Probate & Properties, LLC

> 484-919-9762

>

>

>     -------- Original Message --------

>     Subject: Re: [W126 Coupe] no fuel flow

>     From: Dick Spellman <spell.yy at verizon.net>

>     Date: Fri, January 11, 2008 8:11 pm

>     To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>

>     Actually Markus. If the return line is open would you be sucking

>     air and

>     loosing the prime on the fuel pumps??? Never having tested with both

>     lines open, I have no way of knowing if this is what you dealing

>     with so

>     just a guess.

>

>     Dick

>

>     Markus Meyer wrote:

>     > Hi Dick,

>     >

>     > I think you misread, or I didn't communicate well. The "toasted

>     > engine" is outta there. I put in another motor from KNOWN GOOD CAR

>     > that ran fine! I do NOT have the lines hooked up to the engine

>     yet, I

>     > am simply testing that fuel gets FROM the tank TO the fuel

>     > distributor. The supply line coming from the tank to the

>     distributor

>     > is hooked into a bottle for now. I thought the accumulator in the

>     > back by the pumps/filter is for warm starts. I thought running the

>     > pumps in constant on should cause fuel to flow. I am NOT trying to

>     > check starting the car yet, that's the next step. I wanted to make

>     > sure fuel was flowing first, since the car itself was an

>     unknown, but

>     > the engine is not. Make sense? So I am not trying to test pressures

>     > or any of that. I am just trying to make sure fuel flows from

>     pump to

>     > fuel distributor, which right now, it is not.

>     >

>     > Markus Meyer

>     > mfm at meyerprobateproperties.com <#Compose>

>     > <mailto:mfm at meyerprobatepropertie%0A%20s.com>

>     > www.meyerprobateproperties.com

>     <http://www.meyerprobateproperties.com/> &l

>     t;http://www.meyerprobateproperties.com/>

>     > Meyer Probate & Properties, LLC

>     > 484-919-9762

>     >

>     >

>     > -------- Original Message --------

>     > Subject: Re: [W126 Coupe] no fuel flow

>     > From: Dick Spellman <spell.yy at verizon.net <#Compose>>

>     > Date: Fri, January 11, 2008 7:29 pm

>     > To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com <#Compose>>

>     >

>     > Hi Markus,

>     >

>     > Flow. You have a fuel regulator on the supply line before

>     > connecting to

>     > the fuel distributor. That's where I'd test for fuel flow. Also the

>     > return line and damper can be checked which if blocked would

>     restrict

>     > flow on the supply too. Disconnecting at the fuel regulator will

>     tell

>     > you if you have fuel.

>     >

>     > Markus you need a set of gauges for most the pressure tests. Read

>     > 07.3-120 and follow the steps. Given that the engine may have had

>     > excess fuel dumped in there I be sure check the pressures & cold

>     > start

>     > valve plus temp switch that drives this valve and hope the engine

>     > is not

>     > toast from r aw fuel mixing with the oil.

>     >

>     > Dick

>     > not a mech, just a diy'r remember

>     >

>     > Markus Meyer wrote:

>     > > I have an 89 560SEL I just finished transplanting an engine and

>     > trans

>     > > into. I know the motor is good, it came from a good working

>     car. As

>     > > a quick test, I wanted to verify I had fuel coming out of the fuel

>     > > line going into the fuel distributor. That line is what I stuck

>     > into

>     > > a bottle to do the test. Then, I jumpered pins 7&8 on the fuel

>     pump

>     > > relay, and no fuel.

>     > >

>     > > I tested voltage at each of the pumps (there are 2) and each read

>     > > about 10.5 volts. I also tested continuity on each pump, both read

>     > > about 2 ohms. I can hear both pumps "buzzing/humming". I know

>     > > there's gas in the tank for two reasons - I added about 2-3

>     > gallons,

>     > > and just to make sure it made it to the first pump, I pulled the

>     > hose

>     > > from the tank to the pump off and fuel poured out. Also, when I

>     > got < BR>> the car, I was told the engine might be bad because

>     > "too much fuel"

>     > > was dumping into the engine, so I know there was flow at one

>     point!

>     > > ;

>     > > There doesn't seem to be an easy way to remove the "out" on each

>     > pump

>     > > one by one to test flow, considering the out on each pump is

>     > where the

>     > > wiring connections are, and I don't w ant fuel to pour onto the

>     > live wires!

>     > >

>     > > So what can I check/test? What could be the problem? I should be

>     > > getting fuel flow by doing this test, right? What the heck am I

>     > missing?

>     > >

>     > >

>     > > Markus Meyer

>     > > mfm at meyerprobateproperties.com <#Compose> <#Compose>

>     > <mailto:mfm at meyerprobateproperties.com <#Compose> <#Compose>>

>     > > www.meyerprobateproperties.com

>     <http://www.meyerprobateproperties.com/>

>     > <http://www.meyerpro%0A%20bateproperties.com/

>     <http://www.meyerpro%0a%20bateproperties.com/>>

>     > <http://www.meyerprobateproperties.com/>

>     > > Meyer Probate & Properties, LLC

>     > > 484-919-9762

>     > >

>     >

>     ------------------------------------------------------------------------

>     > >

>     > > The MB Coupes Website!

>     > > W126 SEC Mailing List

>     > > Postings remain property of MB Coupes, L.L.C.

>     >

>     > The MB Coupes Website!

>     > W126 SEC Mailing List

>     > Postings remain property of MB Coupes, L.L.C.

>     >

>     >

>     ------------------------------------------------------------------------

>     >

>     > The MB Coupes Website!

>     > W126 SEC Mailing List

>     > Postings remain property of MB Coupes, L.L.C.

>

>     The MB Coupes Website!

>     W126 SEC Mailing List

>     Postings remain property of MB Coupes, L.L.C.

>

> ------------------------------------------------------------------------

>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20080111/ccfbec91/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: moz-screenshot-26.jpg
Type: image/jpeg
Size: 365990 bytes
Desc: not available
Url : <http://www.pairlist.net/pipermail/mbcoupes/attachments/20080111/ccfbec91/attachment-0001.jpg>