Random misfire/no start om617 - Page 2 - PeachParts Mercedes-Benz Forum

tangofox007 · #16 03-06-2011, 02:59 PM

Quote:

Originally Posted by ashedd

I did try to "pump" the primer on the TD and noticed the primary filter would sorta fill with fuel then "leak" back down(away from the pump).

That would be consistent with the suction valve not closing. The valve and spring are behind a plug on the bottom of the lift pump, below the supply line connection.

The valve is operated by a very "light duty" spring. It doesn't take much to gum it up so it doesn't close. The 617 FSM mentions the importance of cleaning the pump valves.

jt20 · #17 03-06-2011, 03:11 PM

which one is the 'suction' valve?

wouldn't both plastic valves have to be leaking?

tangofox007 · #18 03-06-2011, 03:19 PM

Quote:

Originally Posted by jt20

which one is the 'suction' valve?

Discharge valve is to the front, suction valve to the rear.

ashedd · #19 03-06-2011, 04:09 PM

no joy on the crows foot, tried three different places.

I will order a new primer pump, since both mine are the old style. Tomorrow I will attempt to remove the pump ass'y and see what I can do. Are there any words of caution in reference to loosing parts when I take the pump off?

I think my 300d will be ok to get me around town. There is a whine from the rear diff at speeds over 50.. I will stay away from the highway.

I hope it gets a little warmer out

whunter · #20 03-06-2011, 10:17 PM

Quote:

Originally Posted by jt20

which one is the 'suction' valve?

wouldn't both plastic valves have to be leaking?

Fastlane: REBUILD KIT, DIESEL LIFT PUMP/FUEL PUMP, DOES NOT INCLUDE THE LARGE PLUNGER SPRING OR LARGE PLUNGER COVER SEAL RING, APPLICATION: OM616.912, OM617, 910, 912, 950, 951, 952
http://catalog.peachparts.com/item.wws?sku=0000900210
pictures on install are here.
OM617.951 and .952 Lift pump Repair kit W126.120 300SD W123.133 300D
http://www.peachparts.com/shopforum/mercedes-parts-reference-library/183451-om617-951-952-lift-pump-repair-kit-w126-120-300sd-w123-133-300d.html#post1461282

ashedd · #21 03-07-2011, 04:38 PM

lift pump off. suction valve looks fine. I will get the rebuild kit and a new primer. I don't think I want to yank the lift pump off my SD.

ashedd · #22 03-16-2011, 04:27 PM

Replaced the primer pump and bought the "rebuild" kit from fastlane.

Same thing!!!

I am tempted to call a salvage yard and tell them to come get it. I got rid of two cars in two days, I am on a roll. Right now I am charging the batt since I ran it down. If it doesn't start and idle normally... well I dunno, but I am REALLY sick of messing with it.

Still on the hunt for a w124 wagon as a daily driver. Found some.. either not nice enough or too expensive.

ashedd · #23 03-16-2011, 04:52 PM

ok, now that I got that out of my system.

It's running fine off a container of kerosene. That is all I had laying around. I put a little oil in there for good measure.

So it seems the tank screen in clogged or something.

whunter · #24 03-16-2011, 05:39 PM

Quote:

Originally Posted by ashedd

ok, now that I got that out of my system.

It's running fine off a container of kerosene. That is all I had laying around. I put a little oil in there for good measure.

So it seems the tank screen in clogged or something.

We have a winner...

It's ALIVE...

Emptying the fuel tank
Emptying the fuel tank

Why do I have vacuum in my diesel tank.....................?
Why do I have vacuum in my diesel tank.....................?

MB diesel filtration, how it works.
http://www.peachparts.com/shopforum/diesel-discussion/141211-mb-diesel-filtration-how-works.html#post1055075

Diesel filters, no tank strainers please.
http://www.peachparts.com/shopforum/diesel-discussion/140349-diesel-filters-no-tank-strainers-please-post1046422.html?posted=1

Algae/Fungus fixation...
Algae/Fungus fixation...

Biobor, what is it, why do I need it???
http://www.peachparts.com/shopforum/diesel-discussion/105304-biobor-what-why-do-i-need.html#post723857

Filters, Fungus, Biocide, etc.
http://www.peachparts.com/shopforum/diesel-discussion/115952-filters-fungus-biocide-etc-post823378.html

Algae Clogged Filter Pic StarTron WORKS !
Algae Clogged Filter Pic StarTron WORKS !

240D fuel tank removal and cleaning
Good for any W123 sedan.
http://www.peachparts.com/shopforum/diesel-discussion/92826-240d-fuel-tank-removal-cleaning-post813925.html

Check out this fuel pickup screen
Check out this fuel pickup screen

W123 Fuel Tank Screen Replacement
W123 Fuel Tank Screen Replacement

.

ashedd · #25 03-16-2011, 05:41 PM

I have not found a source, but I did go look under the car...

Let me guess.. I need to drop the tank to get to the screen on a wagon?

Now I need to order that down pipe and get those studded snow tire off there.

whunter · #26 03-16-2011, 06:21 PM

Quote:

Originally Posted by ashedd

I have not found a source, but I did go look under the car...

Let me guess.. I need to drop the tank to get to the screen on a wagon?

Now I need to order that down pipe and get those studded snow tire off there.

Fastlane: Fuel Screen
http://catalog.peachparts.com/item.wws?sku=W0133-1627133

Cheap 22mm allen Tank strainer tool
Cheap 22mm allen Tank strainer tool

FYI: Allen wrench fuel tank screen tool
FYI: Allen wrench fuel tank screen tool

.

ashedd · #27 03-16-2011, 06:27 PM

So it's on the bottom of the tank? I did not look all that hard. I have like 3/4 of fuel too. Might have to get my little 12v pump and pump it out. At 300k miles I am sure the tank is full of junk.. clean it out with that bio(?) stuff?

Thanks

whunter · #28 03-17-2011, 12:46 PM

Quote:

Originally Posted by ashedd

So it's on the bottom of the tank? I did not look all that hard. I have like 3/4 of fuel too. Might have to get my little 12v pump and pump it out. At 300k miles I am sure the tank is full of junk.. clean it out with that bio(?) stuff?

Thanks

Picture attached.

ashedd · #29 03-17-2011, 01:32 PM

Thank you very much!

whunter · #30 03-17-2011, 02:29 PM

Quote:

Originally Posted by ashedd

Thank you very much!

You are welcome.

Always happy to help keep a Mercedes where it belongs, driving down the road.