My IP is leaking diesel, help - PeachParts Mercedes-Benz Forum

BLACKCDI · #1 10-07-2009, 06:38 PM

The injection pump on my 1987 300D sprung a pretty sizable fuel leak coming from the side plate that is secured with regular bolts with flat head screw driver slots in them. It seems to me it's a pretty straight forward access. What type of seal does it take and where can I get one?
I pretty much tackled all the small oil leaks, and now this!

Diesel911 · #2 10-07-2009, 07:59 PM

Quote:

Originally Posted by BLACKCDI

The injection pump on my 1987 300D sprung a pretty sizable fuel leak coming from the side plate that is secured with regular bolts with flat head screw driver slots in them. It seems to me it's a pretty straight forward access. What type of seal does it take and where can I get one?
I pretty much tackled all the small oil leaks, and now this!

The above describes the Cover Bolts. In the attached pic below a red arrow points at the Fuel Inectin Pump cover. There is no Fuel behind that cover. That part of the Fuel Injection Pump is lubricated by the Engine Oil.
(In order for Fuel to come out of that cover you would have to have a serious leak inside of your Fuel Injection Pump and you would be getting Fuel mixed in with your Engine Oil. Check your the Engine Oil level in your Engine; if it is rising above what it was you yave such a leak.)

More likely Fuel is runing down from the top of the Fuel Injection Pump and onto the cover. Clean and degrease the (Cold) Fuel Injection Pump. When it is dry run the Engine a see where the leak is coming from.

Here is the site where I got the pic from; select your vehicle:
http://www.detali.ru/cat/oem_mb0.asp?TP=1

babymog · #3 10-07-2009, 08:23 PM

Yes, check oil level.

I can tell you from experience that having fuel/oil mix fill the crankcase to the point where the crank hits it, is a bad case of runaway that the fuel shutoff will not affect.

scottmcphee · #4 10-07-2009, 08:36 PM

If it's coming out the side cover, get the gasket from MB parts.
There are 2 styles of plate, therefore 2 gaskets. I bought both not knowing, so in the end I have a spare gasket I will never use.. if you need the part, it's yours.

babymog · #5 10-07-2009, 09:27 PM

Like your sig Scott.

BLACKCDI · #6 10-07-2009, 09:57 PM

I am starting to get worried, checked my oil lever on cold and it seems higher than normal but not by much. I really don't have time to take out the ip pump, this would be a real bummer! I will monitor the level. Checked the top of the ip, looks clean. But I will clean it and check again!

BLACKCDI · #7 10-07-2009, 11:48 PM

Just cleaned the IP and it seems the fuel leak is actually coming from some kind of valve gasket right below that cover, in the pic below it has an arrow ponting to it. That valve has a fuel line going right to it. The cover does have a small oil leak it seems, but can't really tell right now so Scott I sent you a pm for that spare gasket! Thanks!
Keeping my fingers crossed that I don't have an internal fuel leak, cause that would suck!

babymog · #8 10-08-2009, 09:46 AM

Lift pump.

Diesel911 · #9 10-08-2009, 11:05 AM

Take an even closer look. The older Fuel supply/Lift Pumps had Copper or Aluminum Crush washer type gaskets and if so on yours you sould be able to see the Copper or Aluminum. If it has this type of gasket carefully tighten it a little.

If not your Fuel Supply Pump uses rubber O-rings to seal that area and if it is leaking you can replace the O-Ring; tightening it would not help.

You take the numbers from the Number Plate on your Fuel Injection Pump and if the Fuel Supply Pump has its own number plate and go to any Boach Autorized Fuel Injection Shop and they can get the parts you need.

Also some of the new models usse O-rings to seal their Fuel Line connections; so that could be another source of leaks.

Oldwolf · #10 10-08-2009, 11:48 AM

I think Peach Parts here has a rebuild kit for your pump.