[diesel_mercedes] E- Fuel Pumps

 



Yes , of _course_ the Germans used a fuel pump safety relay ! .

In D-Jetronic equipped cars it's a small thing .

If your car has the CIS ? k-Jet ? system with the air flow box , it has contacts in the air box , the left most two IIRC , easy to jumper with an unbent paper clip but serious FIRE HAZARD when you do this if it gets any leak _anywhere_ in the fuel injection system .

-Nate
       <attymw@...> wrote :


I do not believe there are electrical shut off mechanisms.  Don;t know about the connection to the pump itself.

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[diesel_mercedes] Re: I'm Stumped

 



The (square , plastic IIRC) fuel filter next to the pump needs to be changed ASAP .

Bosch electric fuel pumps use the fuel they're pumping through (at a rather high pressure (32 #)  and volume) to lubricate and cool them ~ back in the day , every time a Customer ran their Bosch fuel injected car out of fuel , it needed a $300 new pump....

Change that filter every 12 months or 10,000 miles or you'll be doing this a  _LOT- .

-Nate
        <attymw@...> wrote :

So the 77 280SE stopped while driving and I got towed in.  It would not restart.  Very cold day and it would not start again.


Here's what I did:


1. Took old fuel pump out and put it back in again (tried to buy a new one.  Three tries none fit).

2. Replaced the fuel injection hose with a little larger one.

3. Recharged the battery (it wore down from so many attempts to start).

4. Drained all fuel and put a gallon of fresh fuel in.


Car starts and runs fine now.


Vaccuum stuff?  Air in fuel system?
Any thoughts why it stopped like that on the road would be so greatly appreciated.  I'm so lost.





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[diesel_mercedes] Re: Draining Fuel 77 280SE

 



That's right ~

The fuel tank drain is just that : it drains almost every drop of fuel , it only leaves a quart or so behind .

Didja enjoy the   GAS bath ? , that actually hurts , the new Foo-Foo fuel crap attacks your skin badly as well as the ground water .

But her it's O.K. because rich republicans don't care if your drinking water is carcinogenic .

Next time , ther'es a tool to pinch closed the flexible fuel hose whilst you have " fun " (not) changing the electric fuel pump and filter....

-Nate
         <attymw@...> wrote :

I went to drain the fuel to change the fuel pump.  It drained all  8 gallons in the tank??

I thought there was only supposed to be enough in reserve and that is what would have to be drained.  The dealer said 2-3 gallons.

If anyone knows what is going on or where I am confused please set me straight.

Thanks!


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[diesel_mercedes] 4.200 RPM Tranny Shifts

 



Kiss your fuel economy GOODBYE .

Plus , you're operating the engine way in excess of it's basic design parameters , don't be upset when it begins leaking oil from every joint and the piston rings begin to go.....

Thrash it all you want but don't complain about needing another quart of oil every fillup .

I can't imagine it being any smoother unless it used to shake like a paint mixer .

My Mercs all chirp the tires up shifting  when I stand on it .

-Nate
      Max     wrote :

So, whats the thinking on a 4200rpm shift? Max

 












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Re: [diesel_mercedes] Fuel injection hose (77280SE)

 

I don't know this car, but my guess is that it is fuel injection so it will have a high pump pressure. You will need to get really good clamping on both ends.  I would try to find an inch of the half and put it in the 3/4 hose.   (Maybe you can reuse part of the old hose.)

Guys at parts houses I have talked to seemed to understand that fuel injection hoses have to be "good stuff" to deal with the pressure.  Ask them for help.

Good luck,
 Bobby

On Sat, Feb 7, 2015 at 4:11 PM, attymw@yahoo.com [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:


That connections to the fuel pump is like braided weeve.  It appears that it is about 1/2. 

Can one that is about 3/4 inch substitute for it if it is the right clamp?

The reason is the bosch fuel pump needs the 3/4 but the connection to the car is 1/2.

Also I could not come up with the 1/2.

Thanks again as always.







--
Toward freedom,

Bobby Yates Emory

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Posted by: Bobby Yates Emory <liberty1@gmail.com>
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Re: [diesel_mercedes] I'm Stumped

 

I'm not entirely familiar with the W116 gasser fuel system, but, it's predecessor, the W108/109, used a vane-type pump that would begin to intermittently seize before finally cashing it all in.  It's possible that when you removed your pump, and shook it, set it on concrete, maybe dropped it, just generally handling it, it freed up.  Adding half a cup of transmission fluid or a few ounces of Marvel Mystery Oil per tank upon fill up will lubricate the vane and get more time out of a worn pump.

The other thing is, the fuel filter may be clogging up.  Turning the car off for 20- or more minutes will have the contaminants falling off the filter element, allowing the engine to start up again, until it re-clogs.  Could also be the same scenario at the strainer in the tank, though, if you pulled the drain plug, the strainer would come out allowing inspection and cleaning.

Mark
From: "attymw@yahoo.com [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Saturday, February 7, 2015 5:47:50 PM
Subject: [diesel_mercedes] I'm Stumped

 

So the 77 280SE stopped while driving and I got towed in.  It would not restart.  Very cold day and it would not start again.


Here's what I did:


1. Took old fuel pump out and put it back in again (tried to buy a new one.  Three tries none fit).

2. Replaced the fuel injection hose with a little larger one.

3. Recharged the battery (it wore down from so many attempts to start).

4. Drained all fuel and put a gallon of fresh fuel in.


Car starts and runs fine now.


Vaccuum stuff?  Air in fuel system?
Any thoughts why it stopped like that on the road would be so greatly appreciated.  I'm so lost.





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Posted by: "Mark in Lakewood, CO" <beeser750@q.com>
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Re: [diesel_mercedes] I'm Stumped

 

I hooked up the pump to the battery directly.  I heard whining but I think I am hearing only the FPR.

Would the pump run without the relay in when connected to the battery?  If not then I think the fuel pump is to blame.

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Re: [diesel_mercedes] I'm Stumped

 


I do not believe there are electrical shut off mechanisms.  Don;t know about the connection to the pump itself.

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Re: [diesel_mercedes] I'm Stumped

 

are there any electrical shut off mechanisms? intermittent short/lost
connection?

On 2/7/2015 4:47 PM, attymw@yahoo.com [diesel_mercedes] wrote:
> So the 77 280SE stopped while driving and I got towed in. It would not
> restart. Very cold day and it would not start again.
>
>
> Here's what I did:
>
>
> 1. Took old fuel pump out and put it back in again (tried to buy a new
> one. Three tries none fit).
>
> 2. Replaced the fuel injection hose with a little larger one.
>
> 3. Recharged the battery (it wore down from so many attempts to start).
>
> 4. Drained all fuel and put a gallon of fresh fuel in.
>
>
> Car starts and runs fine now.
>
>
> Vaccuum stuff? Air in fuel system?
> Any thoughts why it stopped like that on the road would be so greatly
> appreciated. I'm so lost.
>
>
>
>
>
>

---
This email has been checked for viruses by Avast antivirus software.
http://www.avast.com

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[diesel_mercedes] I'm Stumped

 

So the 77 280SE stopped while driving and I got towed in.  It would not restart.  Very cold day and it would not start again.


Here's what I did:


1. Took old fuel pump out and put it back in again (tried to buy a new one.  Three tries none fit).

2. Replaced the fuel injection hose with a little larger one.

3. Recharged the battery (it wore down from so many attempts to start).

4. Drained all fuel and put a gallon of fresh fuel in.


Car starts and runs fine now.


Vaccuum stuff?  Air in fuel system?
Any thoughts why it stopped like that on the road would be so greatly appreciated.  I'm so lost.





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[diesel_mercedes] Fuel injection hose (77280SE)

 

That connections to the fuel pump is like braided weeve.  It appears that it is about 1/2. 

Can one that is about 3/4 inch substitute for it if it is the right clamp?

The reason is the bosch fuel pump needs the 3/4 but the connection to the car is 1/2.

Also I could not come up with the 1/2.

Thanks again as always.


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Re: [diesel_mercedes] Draining Fuel 77 280SE

 

Well maybe didnt remove it right.  It all came out not trained from the tank but upon removal of the pump.

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Re: [diesel_mercedes] Draining Fuel 77 280SE

 

2-3 gallons is about right for the reserve, but, that reserve light may come on before the fuel level gets that low.  As Bill in Corvallis wrote, if you pulled the lowest drain plug, nearly all the gas will be out, save for some residual, maybe a quart.

Do you need to remove the fuel to change the pump on the SE?  I thought the pump on those was external, right next to the tank....

Mark
From: "attymw@yahoo.com [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Saturday, February 7, 2015 7:09:59 AM
Subject: [diesel_mercedes] Draining Fuel 77 280SE

 

I went to drain the fuel to change the fuel pump.  It drained all  8 gallons in the tank??

I thought there was only supposed to be enough in reserve and that is what would have to be drained.  The dealer said 2-3 gallons.

If anyone knows what is going on or where I am confused please set me straight.

Thanks!


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Posted by: "Mark in Lakewood, CO" <beeser750@q.com>
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RE: [diesel_mercedes] Draining Fuel 77 280SE

 

If the drain plug is at the lowest point in the tank, you’ll get all the diesel.

If not, or if you had the car jacked up high in the back, there may still be some in there.  Bill in Oregon

From: diesel_mercedes@yahoogroups.com [mailto:diesel_mercedes@yahoogroups.com]
Sent: Saturday, February 07, 2015 6:10 AM
To: diesel_mercedes@yahoogroups.com
Subject: [diesel_mercedes] Draining Fuel 77 280SE

 

I went to drain the fuel to change the fuel pump.  It drained all  8 gallons in the tank??

I thought there was only supposed to be enough in reserve and that is what would have to be drained.  The dealer said 2-3 gallons.

If anyone knows what is going on or where I am confused please set me straight.

Thanks!

 

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[diesel_mercedes] Draining Fuel 77 280SE

 

I went to drain the fuel to change the fuel pump.  It drained all  8 gallons in the tank??

I thought there was only supposed to be enough in reserve and that is what would have to be drained.  The dealer said 2-3 gallons.

If anyone knows what is going on or where I am confused please set me straight.

Thanks!


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Posted by: attymw@yahoo.com
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