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Fuel Line Connection To Fuel Tank


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Just replaced my fuel line from tank to carb and just wondering: do i really need to splice in rubber fuel line between the plastic fuel line and tank as shown in all the illustrations - as this?

post-34951-0-90531500-1375225019_thumb.j

Understand i need connection between plastic fuel pipe and carb but the plastic line slips onto the fuel sender nicely (i'll add a clip), so just thought less joints are a good thing and do away with the extra rubber.

I cant see a reason why i need to add the extra length of rubber fuel line to connect to fuel tank?

post-34951-0-45050900-1375225172_thumb.j

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Also, the rubber connection is much more flexible than the semi-rigid plastic line so is less likely to either kink or split when bent at a sharp angle.  Use US rubber fuel line of the proper diameter, not the cloth covered stuff from BMW.  Problem with the OEM line is that the cloth cover will hide cracks and splits; then you'll get a tiny leak that's hidden under the cloth, and your fuel pump will suck air instead of fuel.  I learned this the hard way some years ago.

 

And BTW, that plastic fuel line is special stuff, designed to collapse and seal itself if it gets too hot (like in a fire or when you're welding too close).  Since the fuel line runs in the passenger compartment, that's an important attribute for fuel line to have.  So don't replace it with ordinary rubber fuel line.  It seems to last forever...

 

cheers

mike

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Thanks guys,

Understood.

I've got some correct sized rubber fuel line and small clips and yep, the plastic fuel pipe is the correct collapsable version from W&N.

Would it also be recommended to use short sleeves around the plastic line where it runs under the metal body tabs - i've heard somewhere that old cycle inner tube cut into short lengths is good to use to protect from rubbing.

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Mike,

 

This is really great information, thanks for sharing.  I contemplated changing this plastic line out, but I'm glad I didn't and even more so after reading this.  

 

Bob

 

Also, the rubber connection is much more flexible than the semi-rigid plastic line so is less likely to either kink or split when bent at a sharp angle.  Use US rubber fuel line of the proper diameter, not the cloth covered stuff from BMW.  Problem with the OEM line is that the cloth cover will hide cracks and splits; then you'll get a tiny leak that's hidden under the cloth, and your fuel pump will suck air instead of fuel.  I learned this the hard way some years ago.

 

And BTW, that plastic fuel line is special stuff, designed to collapse and seal itself if it gets too hot (like in a fire or when you're welding too close).  Since the fuel line runs in the passenger compartment, that's an important attribute for fuel line to have.  So don't replace it with ordinary rubber fuel line.  It seems to last forever...

 

cheers

mike

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