Posted by The Older Gentleman on May 7, 2007, 3:42 am
> am i correct in
> assuming that since it's gravity fed that i don't want the line
> running uphill at any time??
No
Think syphons.
--
BMW K1100LT 750SS CB400F CD250 SL125
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
Posted by Albrecht via MotorcycleKB.com on May 7, 2007, 9:11 am
Broderick Crawford wrote:
>I can't believe the factory don't put in fuel filtering. Are they nuts?
Hey, don't *ass*-ume that the engineers are "crazy" just because *you* don't
understand their design.
Motorcycle gravity feed fuel systems have filters inside the gas tank.
Fuel systems with electric fuel pumps will have a filter and specify the
replacement interval in the owners manual.
Fuel injected motorcycles have a hose that returns extra fuel to the gas tank,
so the filter helps keep the gas tank clean.
Some carburetors have a tiny fuel screw above the float valve.
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Message posted via http://www.motorcyclekb.com
Posted by Broderick Crawford on May 7, 2007, 11:59 am
Albrecht via MotorcycleKB.com wrote:
> Broderick Crawford wrote:
>
>> I can't believe the factory don't put in fuel filtering. Are they nuts?
>
> Hey, don't *ass*-ume that the engineers are "crazy" just because *you* don't
> understand their design.
>
> Motorcycle gravity feed fuel systems have filters inside the gas tank.
>
> Fuel systems with electric fuel pumps will have a filter and specify the
> replacement interval in the owners manual.
>
> Fuel injected motorcycles have a hose that returns extra fuel to the gas tank,
> so the filter helps keep the gas tank clean.
>
> Some carburetors have a tiny fuel screw above the float valve.
>
Then how do the carb reservoirs get full of shit? We should be replacing
plugged filters not overhauling carbs. (Mine is a 1996 vintage.) I'll be
glad when I get a fuel injected model.
Posted by The Older Gentleman on May 7, 2007, 12:18 pm
> >
> Then how do the carb reservoirs get full of shit? We should be replacing
> plugged filters not overhauling carbs. (Mine is a 1996 vintage.) I'll be
> glad when I get a fuel injected model.
I've never had carb float bowls full of anything, except petrol. Stale
or otherwise.
The closest I ever got was on an old BMW airhead boxer, whose red lead
paint (inside the tank) was starting to go, and was turning into a brown
sludge, but I had in-line filters on that bike and all it did was block
those.
I really don't see there's much of a problem here. I suppose there is
some stuff that's fine enough to get through the filters on fuel taps on
old-style bikes, but it's only grief on bikes that are really ancient or
have been standing for years, in my experience.
--
BMW K1100LT 750SS CB400F CD250 SL125
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
Posted by Albrecht via MotorcycleKB.com on May 7, 2007, 1:42 pm
Broderick Crawford wrote:
>Then how do the carb reservoirs get full of shit? We should be replacing
>plugged filters not overhauling carbs. (Mine is a 1996 vintage.)
The float bowls get filled with water and very tiny rust particles that get
past the screens inside the
gas tank. If you let the motorcycle sit unridden for months or years, the
gasoline evaporates and
leaves gum and varnish. Alcohol additives in the fuel also react with water
to form a white residue.
Fuel filters will filter out big dirt particles, but water will still get by.
> I'll be glad when I get a fuel injected model.
Be careful what you wish for. Fuel injection solves the problem of air
pollution during coasting operation by shutting off the fuel, but FI has its
own set of problems that are not inexpensively solved by knowledgeable owners.
--
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> assuming that since it's gravity fed that i don't want the line
> running uphill at any time??
No