Steel fuel line at Fuel pump -

TopBanana72

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Hi all, I'm trying to connect a new pump-to-carb steel line on a 318. I thought I had it threaded in OK, but when I started engine... drip drip drip. I tried tightening it more but stripped something and broke it. I'm getting a new fuel pump and steel line for a second go at it.

Is there a secret to doing this connection right?

thanks
 

Red63440

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Make absolutely sure you don't cross thread it....!!
 

Durandal25

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Yes. There are tips and tricks to this
1. Assemble them together outside the car.....to get a feel for it
2. When the pump is on the block connect to the fuel pump end then the carb.
3. If you cant thread it on by hand, then its cross threaded.
4. Drink heavily both before and after.
 

moparedtn

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Yep, developing the habit of starting anything threaded by hand first will take you far in this life. :thumbsup:
 

TopBanana72

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OK fellas. I drank and screwed in the new line to the new pump. I'm very certain no cross-treading. I wrenched it pretty tight. I get a little spotting on the old shop towel after running engine. Should I go for one more strong cinch? How tight do these thing go?

thumbnail_IMG_1431.jpg
 

Demonic

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Pretty snug. That's why i posted about the line wrenches, 'cause you will need them. Flare fittings seal at the flare, and adding tape or pipe dope is a bad idea. If the leak persists, one of the flare faces is dirty or galled.
 

Photon440

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Good advice - don't resort to pipe sealant. If it leaks, there's a chance that one of the mating surfaces isn't quite accurate or has a nick. You may be able to seal it with a soft copper cone washer.
age-mercedes-forum%2f105958d1349068492-w109-c-renovation-copper-cones-plumbing-ac-lines-pict2585.jpg
 

TopBanana72

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Thanks all, I got my line wrenches out and went for one final cinch. It was really all it would go.... I mean it's really tight. That seems to have done it, no leaks or spotting on the shop towel.

Thanks to everyone!
 
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