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-   -   W210 wouldn't start, bubbles in fuel lines (http://www.peachparts.com/shopforum/diesel-discussion/199229-w210-wouldnt-start-bubbles-fuel-lines.html)

muleears 09-07-2007 05:23 PM

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:eek: 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:eek: or just leaky fuel lines?

TMAllison 09-07-2007 05:36 PM

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?

muleears 09-07-2007 06:02 PM

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.

Parrot of Doom 09-07-2007 06:42 PM

Remove all the plastic undertrays and check for leaks.

muleears 09-08-2007 02:29 PM

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:confused:

sokoloff 09-08-2007 06:02 PM

That banjo bolt has an O ring and that's where mine was leaking a few months ago.

TMAllison 09-08-2007 06:23 PM

Quote:

Originally Posted by muleears (Post 1614690)
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:confused:

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.

Parrot of Doom 09-08-2007 07:19 PM

Quote:

Originally Posted by muleears (Post 1614690)
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:confused:

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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