how long does a diesel injection pump last?

Welcome to the Mercedes-Benz Club of America Forums
Here, you'll find members en masse who can talk, guide, answer or listen to your Mercedes-Benz related questions and comments. Participation in the forums is free to Club members. If you're a guest of this site, you'll have access to our read-only discussions. Like what you see? Join the Club to get full Q&A privileges. If this is your first visit, be sure to check out our FAQ page.  To start viewing messages, select the forum that you want to visit from the selection below.

Forum Jump

2 replies [Last post]
merrill's picture
Austin, TX
Joined: December 15th, 1997


1998 C230
1978 300D
1966 230SL

Hi all,
I have a 78 300D,  199,000 miles on it.  I was wondering how long the diesel injection pumps last before requiring a rebuild?


Share this

Jeff Klepac's picture
Olathe, KS
Joined: March 8th, 2005


2013 C300 4MATIC
2004 SLK230
1976 240D
How long does a Diesel Injection Pump last?

Good evening Matt...

As far as I know, there is no scheduled rebuild interval for the diesel injection pumps.
The IPs used on your car (and mine) are precision devices that provide many years of service.  

Other than a couple of leaky o-rings, mine has been pretty much trouble free.

There are two things that I can think of that will ensure a long service life.  Those being; 1. Always using clean diesel fuel and 2. Engine oil changes done at the proper service intervals.  The engine oil in your 300D also circulates through your injection pump to lubricate the IP internals, so that's another reason to keep the engine oil changed on a regular basis.  

Some of the injection pump problems I've read about are often brought on by someone who 'fiddles' with the pump while trying to repair a leak.  Although their attempts are made with good intentions, they often remove internal parts and get them out of proper sequence (or lose some of them altogether) and from there on their problems begin to escalate.  

If this happens, or if for some reason you do need to have an IP rebuilt, choose your rebuilder carefully. Not everyone has the know how and tools that are needed to do it properly.    


 Jeff Klepac - Past President | Mercedes Benz Club of America | Kansas City Section
'76 240D   'Silverstar Preservation'  class
'13 C300
'04 SLK230

Stygimoloch's picture

The injection pump will last

The injection pump will last beyond the life of the engine unless it is abused with improper fuels (WVO) or run dry of oil.
The vast majority of injection pumps sent in for rebuilding are because of misdiagnosis. The problem is almost always related to injectors, fuel filters, engine compression or dirty fuel.

For those wanting to modify their pump to get more power, here is an aid:


AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

Forum Jump

Share this