PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)
-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   1996 E300 Injection Pump Help Needed (http://www.peachparts.com/shopforum/diesel-discussion/398143-1996-e300-injection-pump-help-needed.html)

oilslick 03-24-2019 09:03 PM

1996 E300 Injection Pump Help Needed
 
The car sat for two years with the hard metal lines removed. The system primed easily enough, but line #3 has a terrible amount of air coming through it even after the engine has run for a good while. When the fitting is cracked open there's an enormous quantity of foam spewing from the line. None of the other cylinders exhibit this behavior. It seems this would be an internal issue with the pump. Any suggestions?

Father Of Giants 03-24-2019 09:28 PM

If it was sitting exposed, my guess is that element is toast. Either rebuild or good used pump.

gmog220d 03-24-2019 09:55 PM

The delivery valve could be held open by a chunk of dirt, allowing fuel to push/pull instead of just pushing out. I'd take it apart and have a look. Might be as simple as cleaning it up and putting it back together with a fresh o-ring and crush washer.

oilslick 03-24-2019 10:38 PM

Possibility
 
Quote:

Originally Posted by gmog220d (Post 3903179)
The delivery valve could be held open by a chunk of dirt, allowing fuel to push/pull instead of just pushing out. I'd take it apart and have a look. Might be as simple as cleaning it up and putting it back together with a fresh o-ring and crush washer.

I was hoping that was a good possibility. I'll check that out tomorrow. I'm glad I have a few extra o-rings and new washers around. 👍🏻

oilslick 03-24-2019 10:44 PM

Thanks!
 
Quote:

Originally Posted by Father Of Giants (Post 3903170)
If it was sitting exposed, my guess is that element is toast. Either rebuild or good used pump.

I'm hoping that it's not that drastic. I sure hope not, but that's a real possibility.

jake12tech 03-24-2019 11:07 PM

Probably dirt or rust inside

Diseasel300 03-24-2019 11:49 PM

If it sat open and exposed to the air for years then I'd suspect the delivery valve as the most likely culprit. Probably dried out and formed a ring of rust and/or sediment that's preventing it from seating. Pull the #3 DV holder and pull the DV and take a look. If that's all it is, you can probably just polish the seating faces and be back in business.

oilslick 03-25-2019 12:40 AM

Oh well...
 
I removed the DV holder to inspect and found there were two crush washers installed at some point. I cleaned the barrel and pintle. I couldnít really see anything wrong with them. I installed a new washer and O-ring then put it all back together. I fired it up and still had the same air foamed fuel spewing from the line when cracked. Iíll investigate further when I have more time tomorrow. I do believe that itís a rust/debris issue. I also plan to speak with the local Bosch repair shop and see what light they can shed on the subject. Thanks for the replies and suggestions.

oilslick 03-25-2019 11:50 PM

Solved!
 
It appears that I solved the issue...just by chance. I decided to hook up my auxiliary tank I use when doing a purge. I filled it with diesel and hooked up the supply and return hoses that are attached to my auxiliary tank and the issue went away. Apparently the supply hose on the car was pulling air. I pulled it off the car and inspected it closely. Sure enough, it was full of hairline cracks. I installed a brand new supply hose and now sheís nice and quiet.


All times are GMT -4. The time now is 06:03 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website