Re: [MBZ] 300SD lift pump

[Curt Raymond via Mercedes]

I wonder if the replacement will work on a big OM372. The one on the Pisten 
Bully leaks terribly when in use. Seems fine when locked down though.

 -Curt

On Wednesday, March 15, 2023 at 10:09:48 AM EDT, dan penoff.com via Mercedes 
 wrote: 





If the primer pump is bad it’s DOA no matter what due to air getting into the 
system or no fuel flow.

As I recall, when these fail the engine will not start.

Is it possibly the original “mushroom” style pump with the white plastic knob 
that you have to unscrew to release it or the updated version with the black 
(fixed) knob?

If it’s the original version I would change it to the updated pump on principle.

-D

> On Mar 15, 2023, at 9:53 AM, Andrew Strasfogel via Mercedes 
>  wrote:
> 
> My 1985 300SD was running fine until I drove it onto the sloping driveway,
> with the car facing uphill.  Now it won't start.  It attempts to fire but
> isn't receiving fuel.  I have ruled out the fuel filters and glow plug fuse
> and relay (the pre glow light functions normally).
> 
> Could this be a lift pump problem?
> tinyurl.com/2624bc78
> Or a defective primer pump?  Something else?
> 
> Andrew
> 1985 300SD cabernet red
> ___
> http://www.okiebenz.com
> 
> To search list archives http://www.okiebenz.com/archive/
> 
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com

> 
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Re: [MBZ] 300SD lift pump

[Jim Cathey via Mercedes]

> If the primer pump is bad it’s DOA no matter what due to air getting into the 
> system or no fuel flow.

In a pinch you can re-seal the originals.  My 2006 notes on the 240D we had:

Had a look at the manual fuel primer pump.  Not as leaky as I'd
thought.  A little exercise seems to have helped it out too.  I pulled
it off and had a closer look at it.  Really quite a simple device.
The big worry is that if it leaks fuel when you use it it's in danger
of leaking air when you're not using it, and causing starting or
running problems as a result.  The knob on top screws down against a
sealing ring that's on the shaft of the pump, it's very easy to see
how it works and what kind of condition it's in (when off the engine
that is).  The air seal on this one was marginal, but still intact.
Figuring that it was worth a shot, I got out my gasket punch set and
punched a clean 3/4" hole in a sheet of Buna-N rubber scrap I got
from a supply house.  (They couldn't figure out how to sell me such a
small piece, yet it's probably a lifetime supply for my needs.)  Then
I cut out a circle around this, with scissors (the OD is non-critical)
and substituted this for the very tired seal that was on the pump.
Fits fine, and works fine too.  That should reset the clock on that
pump.

-- Jim


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Re: [MBZ] 300SD lift pump

[dan penoff.com via Mercedes]

I beg to differ. Not brilliance, experience.

I’m amazed that one of the mushroom style pumps is still in service. Those 
things have gone the way of CRT TVs from what I know.

Thankfully, an easy fix. Swap it out and all should be well regardless of how 
the car is parked.

-D

On Mar 15, 2023, at 10:25 AM, Andrew Strasfogel  wrote:


And, you are certifiably brilliant. That is exactly my problem. It has the 
original primer and when I pump there is no resistance.

On Wed, Mar 15, 2023, 10:09 AM dan penoff.com via Mercedes 
mailto:mercedes@okiebenz.com>> wrote:
If the primer pump is bad it’s DOA no matter what due to air getting into the 
system or no fuel flow.

As I recall, when these fail the engine will not start.

Is it possibly the original “mushroom” style pump with the white plastic knob 
that you have to unscrew to release it or the updated version with the black 
(fixed) knob?

If it’s the original version I would change it to the updated pump on principle.

-D

> On Mar 15, 2023, at 9:53 AM, Andrew Strasfogel via Mercedes 
> mailto:mercedes@okiebenz.com>> wrote:
>
> My 1985 300SD was running fine until I drove it onto the sloping driveway,
> with the car facing uphill.  Now it won't start.  It attempts to fire but
> isn't receiving fuel.  I have ruled out the fuel filters and glow plug fuse
> and relay (the pre glow light functions normally).
>
> Could this be a lift pump problem?
> tinyurl.com/2624bc78
> Or a defective primer pump?  Something else?
>
> Andrew
> 1985 300SD cabernet red
> ___
> http://www.okiebenz.com
>
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>
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Re: [MBZ] 300SD lift pump

[Andrew Strasfogel via Mercedes]

And, you are certifiably brilliant. That is exactly my problem. It has the
original primer and when I pump there is no resistance.

On Wed, Mar 15, 2023, 10:09 AM dan penoff.com via Mercedes <
mercedes@okiebenz.com> wrote:

> If the primer pump is bad it’s DOA no matter what due to air getting into
> the system or no fuel flow.
>
> As I recall, when these fail the engine will not start.
>
> Is it possibly the original “mushroom” style pump with the white plastic
> knob that you have to unscrew to release it or the updated version with the
> black (fixed) knob?
>
> If it’s the original version I would change it to the updated pump on
> principle.
>
> -D
>
> > On Mar 15, 2023, at 9:53 AM, Andrew Strasfogel via Mercedes <
> mercedes@okiebenz.com> wrote:
> >
> > My 1985 300SD was running fine until I drove it onto the sloping
> driveway,
> > with the car facing uphill.  Now it won't start.  It attempts to fire but
> > isn't receiving fuel.  I have ruled out the fuel filters and glow plug
> fuse
> > and relay (the pre glow light functions normally).
> >
> > Could this be a lift pump problem?
> > tinyurl.com/2624bc78
> > Or a defective primer pump?  Something else?
> >
> > Andrew
> > 1985 300SD cabernet red
> > ___
> > http://www.okiebenz.com
> >
> > To search list archives http://www.okiebenz.com/archive/
> >
> > To Unsubscribe or change delivery options go to:
> > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
> >
> ___
> http://www.okiebenz.com
>
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>
>
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Re: [MBZ] 300SD lift pump

[dan penoff.com via Mercedes]

If the primer pump is bad it’s DOA no matter what due to air getting into the 
system or no fuel flow.

As I recall, when these fail the engine will not start.

Is it possibly the original “mushroom” style pump with the white plastic knob 
that you have to unscrew to release it or the updated version with the black 
(fixed) knob?

If it’s the original version I would change it to the updated pump on principle.

-D

> On Mar 15, 2023, at 9:53 AM, Andrew Strasfogel via Mercedes 
>  wrote:
> 
> My 1985 300SD was running fine until I drove it onto the sloping driveway,
> with the car facing uphill.  Now it won't start.  It attempts to fire but
> isn't receiving fuel.  I have ruled out the fuel filters and glow plug fuse
> and relay (the pre glow light functions normally).
> 
> Could this be a lift pump problem?
> tinyurl.com/2624bc78
> Or a defective primer pump?  Something else?
> 
> Andrew
> 1985 300SD cabernet red
> ___
> http://www.okiebenz.com
> 
> To search list archives http://www.okiebenz.com/archive/
> 
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
> 
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Re: [MBZ] 300SD lift pump

[Buggered Benzmail via Mercedes]

Did you try pumping the primer?

Did you CHANGE YOUR FILTERS?

—FT

Sent from my iPad

> On Mar 15, 2023, at 9:53 AM, Andrew Strasfogel via Mercedes 
>  wrote:
> 
> My 1985 300SD was running fine until I drove it onto the sloping driveway,
> with the car facing uphill.  Now it won't start.  It attempts to fire but
> isn't receiving fuel.  I have ruled out the fuel filters and glow plug fuse
> and relay (the pre glow light functions normally).
> 
> Could this be a lift pump problem?
> tinyurl.com/2624bc78
> Or a defective primer pump?  Something else?
> 
> Andrew
> 1985 300SD cabernet red
> ___
> http://www.okiebenz.com
> 
> To search list archives http://www.okiebenz.com/archive/
> 
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
> 

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