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  #1  
Old 09-07-2007, 05:23 PM
muleears's Avatar
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Join Date: May 2006
Location: Windsor, VA
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W210 wouldn't start, bubbles in fuel lines

I went for a drive today, added about 7 gal of fuel to an almost empty tank and stopped at walmart. Just before stopping the car seemed to be idling somewhat rough. Upon my return to the car it would not start I immediately suspected a load of bad fuel. I pulled the primary filter and it was clean. Then I noticed air in the fuel lines. Not just one but all of them. When I tried to start the car it would just pop and sputter, occasionally running for 5-10 sec. at 4-500 rpm. Immediately upon shutdown the bubbles would come back as if the fuel were draining somewhere. No puddles under the car. My guess is bad O rings on the clear fuel lines. I have had it towed to my Indy and that is what he will check first. What do you guys think? Possibly a bad lift pump, injector pump or just leaky fuel lines?

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'07 E320 Bluetec 133K my DD
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  #2  
Old 09-07-2007, 05:36 PM
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Location: Walnut Creek, CA & 1,150 miles S of Key West
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It's tough to kill it with air once its running. The IP is very efficient at removng it. That usually means the leak is on the supply side.

I'd check the pre-filter o-ring, shutoff valve and the o-ring at the main filter bolt.

Didnt you just do all your fuel lines recently in an attempt to solve a surging problem?
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N. Calif. & S. of Key West

09' E320 Bluetec 77k
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  #3  
Old 09-07-2007, 06:02 PM
muleears's Avatar
Old MB Driver
 
Join Date: May 2006
Location: Windsor, VA
Posts: 1,435
Still have the surging problem. Have replaced the prefilter O ring and the main filter O ring. This happened suddenly. When I got it to the Indy it would run but very rough and with low power.
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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #4  
Old 09-07-2007, 06:42 PM
Parrot of Doom's Avatar
1997 W210 E300TD 243,000
 
Join Date: Mar 2006
Location: Manchester, UK
Posts: 983
Remove all the plastic undertrays and check for leaks.
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  #5  
Old 09-08-2007, 02:29 PM
muleears's Avatar
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Join Date: May 2006
Location: Windsor, VA
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Leak was visible running down the block from behind the IP. Tech said the banjo bolt there was wet.

Parrot: The front belly pan has been removed, rear still in place. I have not noticed any drips from the car previously.

Could this be related to my ongoing hesitation problem? If my car were sucking air into the fuel lines somewhere during hard acceleration it would make it hesitate and surge like it has been wouldn't it?

I thought most of the fuel lines were under pressure not vacuum
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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #6  
Old 09-08-2007, 06:02 PM
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Location: Ocean Isle Beach, NC
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That banjo bolt has an O ring and that's where mine was leaking a few months ago.
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  #7  
Old 09-08-2007, 06:23 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
Quote:
Originally Posted by muleears View Post
Leak was visible running down the block from behind the IP. Tech said the banjo bolt there was wet.

Parrot: The front belly pan has been removed, rear still in place. I have not noticed any drips from the car previously.

Could this be related to my ongoing hesitation problem? If my car were sucking air into the fuel lines somewhere during hard acceleration it would make it hesitate and surge like it has been wouldn't it?

I thought most of the fuel lines were under pressure not vacuum
Pretty sure that line is on the return rather than feed side of things.

http://www.peachparts.com/shopforum/newreply.php?do=newreply&p=1614690
The lift pump creates a vacuum that draws fuel up from the tank.

Is always best to fix any leak that you have first as they are commonly related to other problems. Hopefully what began as a nagging surging issue is now a failure causing the sudden rough running/stalling and a new o-ring will fix both problems.
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N. Calif. & S. of Key West

09' E320 Bluetec 77k
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  #8  
Old 09-08-2007, 07:19 PM
Parrot of Doom's Avatar
1997 W210 E300TD 243,000
 
Join Date: Mar 2006
Location: Manchester, UK
Posts: 983
Quote:
Originally Posted by muleears View Post
Leak was visible running down the block from behind the IP. Tech said the banjo bolt there was wet.

Parrot: The front belly pan has been removed, rear still in place. I have not noticed any drips from the car previously.

Could this be related to my ongoing hesitation problem? If my car were sucking air into the fuel lines somewhere during hard acceleration it would make it hesitate and surge like it has been wouldn't it?

I thought most of the fuel lines were under pressure not vacuum
Engine is in the front. Fuel tank is in the back. Pipes between the two. Check them.

I suggest you get some Gunk or similar, and scrub the underside of the car clean. Drive it around for a few days, and then go back under to see what is leaking.

Diesel leaks are easy to spot, especially when they land on tarmac - they don't go away for weeks.

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