[W126 Coupe] no fuel flow

[Dick Spellman]

forgot to mention check valve is identified as 32 in the diagram

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

>     > >

>     >

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