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  #1  
Old 10-30-2007, 06:58 PM
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W210 - 606 - '99 E300 - Fuel leak continues

Finally! Got up to the pool of diesel. Had replacement lines and viton o-rings on hand for some time, so replaced all but the one buried under the IM, will do that later.

Leak was from the area of the fuel pump on the IP.

After I replaced them, next morning much better, but not "fixed", replaced o-rings on the suspect connection AGAIN, the one on the bottom of the fuel pump. Very positive click visual inspection looked just as good as the first time.

Fuel "seems" to be coming out of the lower hole in the front of the fuel pump(toward the radiator) and the lower hole on the drivers side of the fuel pump. If the pump were to fail, would it leak out of these holes in the housing of the pump?

How costly and difficult is it to replace.

I have tried pictures, but my camera does not seem to like things so close, could try again.

Help appreciated. Not leaking a lot now, got over 34mpg on a 400 mile trip on Sunday.

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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg
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  #2  
Old 10-30-2007, 07:49 PM
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The lift pump is a very low fail part. It is sealed to the IP by a gasket and if leaking would leak engine oil.

Suggest you pull your two suspect lines again and coat each with a small amount of silicone grease and reinstall. Because of the tight quarters I've had to gently use a pair of channel lock pliers to get enough force to seat the outer line onto the lift pump.

Did you repalce the oring behind the SOV too? When it leaks fuel can be blown rearward traveling along the fuel line to the lift pump making it appear as if it is the offender.
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N. Calif. & S. of Key West

09' E320 Bluetec 77k
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  #3  
Old 10-30-2007, 08:40 PM
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Quote:
Originally Posted by TMAllison View Post
Suggest you pull your two suspect lines again and coat each with a small amount of silicone grease and reinstall. Because of the tight quarters I've had to gently use a pair of channel lock pliers to get enough force to seat the outer line onto the lift pump.

Did you repalce the oring behind the SOV too? When it leaks fuel can be blown rearward traveling along the fuel line to the lift pump making it appear as if it is the offender.
I guess I can pull Humpty Dumpty apart again and grease up, would not hurt anything but my knuckles.

Which o-ring do you speak of behind the Shut off Valve? Please provide suggestions here.

Thanks
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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg
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  #4  
Old 10-30-2007, 08:46 PM
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The SOV has two fuel lines that seal to it. It also has a much larger oring where the body of the valve seals to the the IP (ie: behind it).
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N. Calif. & S. of Key West

09' E320 Bluetec 77k
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  #5  
Old 10-30-2007, 09:16 PM
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Quote:
Originally Posted by TMAllison View Post
The SOV has two fuel lines that seal to it. It also has a much larger oring where the body of the valve seals to the the IP (ie: behind it).
I do have a new viton O-ring for the Shut-off Valve.
How do I go about replacing that one?
"Feels" like two Torque-X type bolts. Is that all I need to take out?
Any perils in taking this off? Flying parts, flood of diesel etc.?

Thanks, the bottom of the SOV is wet with diesel, so I doubt the O-ring issue but will do with the other.

Thanks,
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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg
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  #6  
Old 10-30-2007, 11:05 PM
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Are these the 2 Torque-X bolts which are prone to break or spin out the shallow head? Or am I thinking of something else?
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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg
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  #7  
Old 10-30-2007, 11:38 PM
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Location: Walnut Creek, CA & 1,150 miles S of Key West
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They are torx and yes, a couple of folks have had problems with them rounding out and have had to drill them.

Pull the windshield washer bottle for more access, then spray them down with cleaner of choice b4 inserting bit. Came out easy for me using a 5" long 1/4" drive rachet with 3" extension. Might be tougher if you arent right handed....

I removed the small line from the end of the lift pump and the top of the other two longer lines where they attach to the filter housing and then snaked it out as a unit from under the mainifold and swaped the oring on the work bench. Put back in the same way.
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09' E320 Bluetec 77k
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  #8  
Old 10-31-2007, 12:07 AM
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Thanks

Thanks TMAllison, I will make another run at it this weekend. Luckily it gets little use during the week.

So far this really has not been a bad job, just poor timing for me. Should have done it when I had the time instead of late night and early morning panic sessions.

Really appreciate your assistance.
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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg
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  #9  
Old 11-01-2007, 07:30 PM
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Changed that one too

along with the pre-filter and spin-on filter.

Literally took less than 15 minutes, that was weird. Silly easy and fast.

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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg
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