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Author Topic: Fuel line  (Read 6875 times)

Offline frodef

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  • 1986 K75C
Fuel line
« on: November 21, 2011, 03:41:55 PM »
When I started up the old beemer today after a few weeks rest, gasoline squirted out of the engine. Turned out the fuel line (the one coming out of the tank and into the rail in front of the throttle body) was almost disintegrated. I replaced it (just a generic fuel line, right?) but thought I'd inquire here if there's anything non-obvious about this I need to know about? I noticed there was a similar hose right behind this one (return line?) that I guess I'll replace too with the same tubing.
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Offline frankenduck

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Re: Fuel line
« Reply #1 on: November 21, 2011, 04:06:58 PM »
I did this recently on a K1100RS.  Make sure that you use fuel line that's rated for fuel injected fuel systems.  It should say so (or not) right on the hose.  The other line is a return hose from the fuel pressure regulator.
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Offline frodef

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  • 1986 K75C
Re: Fuel line
« Reply #2 on: November 21, 2011, 04:59:30 PM »
Quote from: frankenduck on November 21, 2011, 04:06:58 PM
Make sure that you use fuel line that's rated for fuel injected fuel systems.
Never thought of that, thanks! I suspect the one I got is not rated for fuel injection. I'll have the entire winter (sigh) to find a some better tubing.
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Offline motodude

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Re: Fuel line
« Reply #3 on: November 21, 2011, 05:13:55 PM »
One way to tell is by the price.  FI hose is quite a bit more expensive than "regular" fuel hose.

I believe that the return line has as much pressure as the outgoing (from the tank) line too.

Tom
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'95 K75RT
'90 K75RT
'87 K100RS Motorsport
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Offline Chaos

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Re: Fuel line
« Reply #4 on: November 21, 2011, 05:48:39 PM »
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
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Offline wmax351

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Re: Fuel line
« Reply #5 on: November 21, 2011, 10:40:12 PM »
Return line (After FPR) has almost no pressure. There is nothing to resist the flow.

Just get good EFI rated line. I bought mine from the dealer, as it is good quality, and not unreasonable.

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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline motodude

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Re: Fuel line
« Reply #6 on: November 22, 2011, 10:51:19 AM »
Quote from: wmax351 on November 21, 2011, 10:40:12 PM
Return line (After FPR) has almost no pressure. There is nothing to resist the flow.

That makes sense, I was thinking of the line coming off the other end of the fuel rail, prior to the pressure regulator.
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'95 K75RT
'90 K75RT
'87 K100RS Motorsport
No, I am not cool.  Yes, it really is the journey.

Offline frankenduck

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Re: Fuel line
« Reply #7 on: November 22, 2011, 11:38:54 AM »
Quote from: wmax351 on November 21, 2011, 10:40:12 PM
There is nothing to resist the flow.

Well, there is gravity and fluid turbulence. ;D
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Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

Offline motodude

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Re: Fuel line
« Reply #8 on: November 22, 2011, 10:05:38 PM »
Quote from: frankenduck on November 22, 2011, 11:38:54 AM
Well, there is gravity and fluid turbulence. ;D

I don't know about fuel lines, but every time I get drunk that effin' gravity efs me up!  And, don't even get me started on effin' fluid turbulence, one time I fell in the effin' river!  :-[
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'95 K75RT
'90 K75RT
'87 K100RS Motorsport
No, I am not cool.  Yes, it really is the journey.
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