[W126 Coupe] no fuel flow

[Dick Spellman]

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 

> <mailto:mfm at meyerprobatepropertie%0A%20s.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 7:29 pm

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

>

>     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 want 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>

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

>     > www.meyerprobateproperties.com

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

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

>     > Meyer Probate & Properties, LLC

>     > 484-919-9762

>     >

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