BMW K bikes (Bricks)

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1Back to top Go down    Help....fuel smell on Mon Mar 31, 2014 3:02 pm

Mike101

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On my way home from work I noticed a petrol smell. It was coming from my bike.

I can't find a leak....I'm not loosing and petrol.

I stopped and checked the fuel and return pipes..all fine.

No smell from either side if the engine.

But a smell from the fuel cap....this is a new thing today.

Any ideas.

Mike


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K100LT 1987 Gold and not Beige
XT660Z Tenere
    

2Back to top Go down    Re: Help....fuel smell on Mon Mar 31, 2014 4:27 pm

japuentes

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Hi there, my guess is that your tank vent. primary system is clogged and the tank´s cap safety valve is releasing the overpressure and letting you know.
Best regards
JAP


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1988 K100RS SE/ABS
    

3Back to top Go down    Re: Help....fuel smell on Mon Mar 31, 2014 5:37 pm

Comberjohn

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Hope JAP is correct in his diagnosis but I've been here twice on two different K's. An 89 LT and my current 84 RT.
The leaks were tiny and with the insulation on the base of the tank and the rubber pieces in around the fairing, actual leaks are hard to spot in the early stages.
If the cap is ok, take out the fairing pockets and trim and inspect the tank along the bottom seam for bubbles in the paint and check the base for dampness.


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Life is not a rehearsal.

2010 R1200GS
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

4Back to top Go down    Re: Help....fuel smell on Mon Mar 31, 2014 5:49 pm

Mike101

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Are there any vents other than the overfill one at the cap.

Not sure if I should use the bike now.  The only place I could smell fuel was around the cap.

Mike


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K100LT 1987 Gold and not Beige
XT660Z Tenere
    

5Back to top Go down    Re: Help....fuel smell on Mon Mar 31, 2014 6:00 pm

Comberjohn

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Depends on how bad it smells. If it's just the faintest whiff now and again, I wouldn't worry too much. Probably is the cap.
If it makes your eyes water, it needs looking into sooner rather than later.
When the tank on the LT started it wasn't too bad. Picked at a paint blister along the bottom edge and it turned into a 2mm hole. Was glad I was at home at the time.


__________________________________________________
Life is not a rehearsal.

2010 R1200GS
1986 K100 Silver(gone)
2012 K1600GT(gone)
1984 K100RT Madison Silver(gone)
1989 K100LT Stratus Grey(gone)
1984 K100 Red(gone)
http://www.johnsdrivingschool.co
    

6Back to top Go down    Re: Help....fuel smell on Mon Mar 31, 2014 6:25 pm

Mike101

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It's just a slight wiff but not all the time.

Today has been a warm day here..20c..and it's the first time I have used the K in warm weather.

Also the tank is almost empty as well...only started when it got low.

So I will fill up tomorrow and see what happens.

Mike


__________________________________________________
K100LT 1987 Gold and not Beige
XT660Z Tenere
    

7Back to top Go down    Re: Help....fuel smell on Tue Apr 01, 2014 7:27 am

Mike101

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50 miles with a full tank and no smell this morning.

Any ideas?

Mike


__________________________________________________
K100LT 1987 Gold and not Beige
XT660Z Tenere
    

8Back to top Go down    Re: Help....fuel smell on Tue Apr 01, 2014 10:38 am

japuentes

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Mike101 wrote:50 miles with a full tank and no smell this morning.

Any ideas?

Mike
Wen the tank is full, you have a small gas chamber and more fuel mass to heat, so the temperature may not raise enough to reach the relieve valve set point.
There is also much less gas to vent and smell.
Best regards
JAP


__________________________________________________
1988 K100RS SE/ABS
    

9Back to top Go down    Re: Help....fuel smell on Tue Apr 01, 2014 12:13 pm

Mike101

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So is a bit of a smell normal with high heat and an empty tank or are my caps seals on the way out.

Mike


__________________________________________________
K100LT 1987 Gold and not Beige
XT660Z Tenere
    

10Back to top Go down    Re: Help....fuel smell on Tue Apr 01, 2014 12:46 pm

japuentes

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Mike101 wrote:So is a bit of a smell normal with high heat and an empty tank or are my caps seals on the way out.

Mike
I don't think the smell is normal, your cap seal can be at fault, but first I would check the vapor vent system.
Best regards
JAP


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1988 K100RS SE/ABS
    

11Back to top Go down    Re: Help....fuel smell on Tue Apr 08, 2014 5:36 am

Rabidchiwawa007

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The vapor vent system is one of the two hoses that come from the bottom back of the tank, correct?


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1968 BSA Lightning
1991 BMW K100RS 16v with K1100LT fairing
    

12Back to top Go down    Re: Help....fuel smell on Tue Apr 08, 2014 7:16 am

RicK G

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VIP
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That's right.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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