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  #1  
Old 04-02-2015, 04:51 PM
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Trying to install new fuel supply line - 17mm nut is a problem!

On the 1991 560SEL, I'm attempting to remove the OLD fuel supply line (line that comes out left side of fuel filter and connects to a metal line which sends fuel to the engine) and install a NEW fuel supply line. When trying to remove the OLD fuel supply line, I first used brake cleaner to clean up some of the old grease and grime off the nut. Next I sprayed the threads with PCB blaster to loosen things up.

I can get a 17mm angle-adjustable flare nut wrench on it but when I try to turn it, the metal line flexes and I'm afraid if I turn very hard I might break the metal fuel line it attaches to.

Question: Is there a method for securing/bracing the metal fuel line so that the 17mm nut can be turned? Thank you for help/input/assistance.

Note: I edited this post to clarify what I am attempting to do, take off the OLD and install the NEW fuel line.



Last edited by HuskyMan; 04-03-2015 at 10:15 AM.
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  #2  
Old 04-03-2015, 12:01 AM
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That nut should spin freely. You might drop the new filter and check it off the car. Wouldnt be the 1st bad brand new part.
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  #3  
Old 04-03-2015, 09:35 AM
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Quote:
Originally Posted by TnBob View Post
That nut should spin freely. You might drop the new filter and check it off the car. Wouldnt be the 1st bad brand new part.
On the new fuel hose, the nut that connects to the fuel filter spins freely but the nut that connects to the metal line does not spin freely, it is stuck. To clarify, are you saying that both nuts on both ends of the fuel line should spin freely? If so, I got a bum part......

Last edited by HuskyMan; 04-03-2015 at 10:13 AM.
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Old 04-03-2015, 08:23 PM
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I'll answer with a question. If.... the nut doesnt freely turn.. how the hell are ya supposed to get it on and tight ???
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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."
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  #5  
Old 04-04-2015, 09:39 AM
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Don't you hold the one with with a wrench while turning the other?
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  #6  
Old 04-04-2015, 11:43 AM
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The new fuel line part is bad because the nut that attaches the line to the metal line on the car is frozen. The only way it could possibly screw on is to literally turn the entire hose clockwise which considering how tightly things are spaced underneath the car would make it impossible. Therefore, my only choice is to purchase a new hose which will hopefully have nuts that spin freely on both ends.

Bad parts bad parts watchya' gonna do? Watchya' gonna do when they come for you? (Sung to the song 'Bad Boys" from the TV show "COPS".)

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