Cylinder full of GAS.....But HOW????

[Nico]

I took off the #4 intake to put in new O-rings (see my other post about popping) and the cylinder was FILLED WITH GAS.

I don't understand how this can happen, as I have just set up with a belly tank, so the gas is feeding from the belly tank with the fuel pump. The gas does not feed from the tank, so the issue with a possible bad petcock should not be a problem.

HOW would the cylinder get filled with gas? What should I be looking for? I have already had an issue with breaking teeth on the starter gear, so needless to say, I don't want this to happen again.

Where should I be looking for problems???

Nick

[Master Blaster]

If your float valve in the carb isnt seating, debris on the seat, etc, when the ignition is on with engine not running, the fuel pump is pumping and fuel will pass straight through the carb into the cylinder.  It doesnt take a lot of fuel to hydrolock, as you probably already know.   If I need the ignition on when its not running, I disable the fuel pump just for this reason.

[Skeeter (Va)]

If your float valve in the carb isnt seating, debris on the seat, etc, when the ignition is on with engine not running, the fuel pump is pumping and fuel will pass straight through the carb into the cylinder.  It doesnt take a lot of fuel to hydrolock, as you probably already know.   If I need the ignition on when its not running, I disable the fuel pump just for this reason.

   FUEL PUMP AH PUMPIN'   ?

[R J]

If your float valve in the carb isnt seating, debris on the seat, etc, when the ignition is on with engine not running, the fuel pump is pumping and fuel will pass straight through the carb into the cylinder.  It doesnt take a lot of fuel to hydrolock, as you probably already know.   If I need the ignition on when its not running, I disable the fuel pump just for this reason.

   FUEL PUMP AH PUMPIN'   ?

Skeeter, the bike has a belly tank and they use a pump to pump fuel.........

[98valk]

Re: Another hydrolock question

Posted By: 98valk <fitness7days@nospam.juno.com>
Date: 9/4/2008 at 12:30:31

In Response To: Another hydrolock question (G-Man (Gary in NY))

this is from Rider mag sept 1988 about the '88 goldwing GL1500.
they had the hydro-lock problem and it turned out to be the bowl vent hose was sagging. "the low spotfills with gas and prevents air circulation, much like a sink trap. without a connection to atmosphere, the float bowls pressurize and raw fuel is forced up and out of the carbs through the needle jet. From there gravity takes the fuel down the intake runners. if that cylinder has an open intake valve, hydrolock." "The article states that honda issued a Product Update kit on a fix in feb of that yr which included a metal air-vent pipe and a vacuum fuel valve."
Looking at the service manual pics in the carb section it shows the vent hoses as straight sections just laying loosely on top of other hoses. My 98's vent hoses have a 90 degree end. the end is installed into holes in the rear carb support frame.
So this might be the reason and cause of the problem for some bikes.