Topica Loopframe_Guzzi Archive


Subject: Re: Fuel Petcock Problem

Author: Bruce Giller

Date: Jun 5, 2002, 6:30 AM

Post ID: 1710378055


Keith,
My guess is that the carb float bowls were full and the floats didn't
let any more gas into them. And the air in the line did not go back up
into the tank as I would suspect it should have; no idea why it did not.
And when you loosened the hose clamp, the air escaped from the line and
was filled with gas from the tank. No vacuum was in the line at all.

Why not just attach a line to the petcock outlet, and drain gas into a
container to see if the petcock is working?

What you can do (which is messy) to test the carb float bowl, is to
loosen the cap on the bottom of the float bowl and let fuel out of the
carb (this will mimic high speed riding) into a container whilst having
only one petcock on at a time. Then you can see if gas is flowing out
correctly out of each petcock with the carb 'in line'.

Bruce

'72 Eldo

Keith Ruff wrote:
 
Good Morning All,

I replaced both of my fuel petcocks the other night, and last eve filled
up the tank. Turned on the petcocks and nada, no fuel flowing (I have
clear fuel lines so I can see the flow). Tapped each one, nada. Opened
the gas tank, still no flow. I then loosened the clamp holding the fuel
line to the petcock and heard air release, then the fuel was leaking out
of the line by the clamp, so I had to tighten her up again. Did the
same to the other side, but at that point, the fuel had filled up in
that line from the other side, so I couldn't tell if she was flowing.
Patience is burried in the garage behind some basement finishing
materials, and rain is in the forecast for the next few days. I tried
to burn up some fuel at idle to see if fuel is flowing OK, but she just
doesn't eat up the fuel at idle, will have to take her for a ride and
carry a screw driver. Has anybody else experienced this problem or can
you let me know what the problem is? Apparantly I must have had a
vacuum problem initially, but I'm not sure if it is cured. Why would
this vacuum effect exists? Perhaps this was why my right petcock was
not flowing before I changed it out.
Greatly appreciate any help/advice.

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