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Old 08-08-2016, 10:44 AM
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Join Date: Nov 2012
Location: South Africa
Posts: 11
M hand primer pump on OM605 engine?

Greetings, all

I have a W202 C250 Diesel with a OM605 engine. She's powerful, smooth and quiet (when her plastics aren't falling apart...).

I do have one complaint, though:

Replacing the diesel filter is a scary exercise. I'm pretty sure the previous starter was ruined in an attempt to prime the fuel system after replacing the filter. I typically replace the oil, oil filter and air filter, then I reverse her onto the ramps to elevate the fuel tank before replacing the fuel filter.

The Euro-spec W123s sometimes came with M pumps rather than MW pumps. These pumps had hand primer pumps as well. So I'm thinking about installing such a primer pump onto my OM605. I'm also considering installing an electric fuel pump from a gasser, but I'm not sure that that has the pressure to prime the diesel system.

What say you? Is there any reason why the OM605 will not work with a hand primer?


1995 W202 C250 Diesel, OM605 NA engine, 5-speed manual
1986 W123 200, OM617 NA engine, 5-speed manual, rev counter
1989 W126 300SE, 5-speed manual
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Old 08-08-2016, 10:59 AM
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Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 8,065
I would install an electric pump inline either below the tank or near the engine. They are cheap, reliable and depending on how you set if up can give you a performance boost. Most modern EFI gasoline pumps are overkill for ours cars. A diesel solenoid pump will do the job. It's also handy if you ever need to drain the tank or remove air bubbles from the system. On the w210/om606 the powerful lift pump tends to pull in air bubbles through various fuel line connections so adding some positive pressure near the tank aleviates that problem.

I'm using a Delphi fd0040 pump on my om603 and om606. It makes 12psi. I can switch it on manually or automatically over 2.5psi manifold pressure.

CENSORED due to not family friendly words

Last edited by tjts1; 08-08-2016 at 12:09 PM.
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