Question about 1989 Honda GL 1500 Gold Wing

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I have a 1998 Goldwing, the fuel is running from the catch area for fueling out one of the drain hoses. there is a diaphram or something like that in front of the fill cap and it is leaking fuel. How do you replace it or fix it?

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Carbs on that machine ?.You may have a bad/leaking needle and seat in carb,a bad fuel line ,have overfilled with gas.You need to get the covers off to get a good look at it.

Posted on Oct 06, 2009


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1 Answer

Bike is overcharging battery and then kills itself.

Sounds like fuel starvation and you have an air lock in the fuel pipe. You mean it is draining the battery because you keep using the electric start to start it back up?

I have seen air locks in fuel caused by badly routed lines from the gas tank to the carbs. The heat causes the fuel to vaporise and cause a bubble which then doesn't allow the fuel to pass.

Could also be a faulty fuel tap if you have the automatic kind that has a diaphragm that opens when fuel is needed and causes a vacuum which opens the diaphram.

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The hose that goes down by the battery should be an overflow drain.

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When draining a fuel tank do the drain us need to be replaced or can you reuse the same one

Feul tanks do not come with a drain plug. The only way to drain a fuel tank today is to remove it. Removing a fuel tank is a dangerous thing if you do not know all the safety procedures.

Fire extinguisher on hand rated for a fuel type of Fire.

No open flames, and a well ventilated area.

Jack and jack stand And chocks to prevent vehicle from moving.

Brass punch for removing tank locking ring no sparks.

Additional blocks to be placed on jack to hold tank.

An extra person to help in lowering the tank.

Pliers to remove hoses and ground connection.

New fuel rated hose and hose clamps.

Something to stop fuel from leaking back out if hose, something to catch fuel.

A new set of straps and straps protection from rubbing tank.

You will have to remove gas cap and any type of connection that will hinder the removal of tank.

To replace is just a reversal of removal.

Mar 05, 2015 | Cars & Trucks

1 Answer

Fuel over flows thru overflow tubes only when motor is running. motor off ignition on it stops.

Your gas tank petcock is diaphram operated.
there is a vacuum line coming off the intake, that goes straightb to the petcock.
when you turn the motor over a vacuum is created, pulling the petcock diaphram back and allowing fuel to flow to your carburetor. when you turn the motor off the vaumm is gone and the spring behind the diaphram pushes it closed and stops the fuel flow to the carbs.

Now the reason the carbs are overflowing is because the floats valves are not closing, in other words the floats are sticking.
Usually a good carb clean will cure the problem, especially for that year.
the older ones usually require new float valves/seats that are usually found in a good carb rebuild kit. You shouldn't need one.

If your really broke try tapping on the bowls of the carburetor lightly, while the engine is running, sometimes the vibration will vibrate a particle loose that may be holding open the float valve.
if it works then the fuel should stop overflowing while running.

if you know how to work on it, try this, with the engine off.
open the carburetor drain screws so that fuel will run out the carb. drain. flush out the carb.
get a container to catch the gasoline.
while fuel is flowing tap the carb bowls a few times then closed the drain screws.
clean up any spilled gasoline .
start your bike.see if they stop leaking and the floats are closing.
if it still leaks, you'll need the cleaning.

Happy Riding
Best Regards
Big Al

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Cannot start my mcculloch mac160s. geting spark. i heard that a diaphram in carb could be suspect. is this common? what else should i look for?

Start with the easy things first, pull the fuel hose from the tank and replace the filter on the end, check the fuel hose up to the carb for cracks or splits, the carb has two diaphrams, a metering diaphram, which controls the amount of fuel in the carb, much like a float bowl on a normal carb, and a pump diaphram, which pulls fuel from the fuel tank, into the carb, these two items have a long service life, if they have aged or the material attacked by the fuel they can become stiff and not work very well, however i think it unlikley that the saw would not actually start, it may run bad, but it should start.

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The petcock has a safety in it that only allows fuel to flow when there is vaccuum applied to it. There is a second hose beside fuel hose that goes to diaphram in petcock. If the hose collapses or the diaphram ruptures then fuel wont flow. If you pull the hose off the back of the diaphram and see fuel then the diaphram is definitely shot. When you take the tank off fuel shouldn't flow. If you apply vaccuum to the port on the back of the petcock it should begin to flow. If not then petcock is bad. If it does check hose from engine to petcock.

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Jul 20, 2009 | 1989 Honda GL 1500 Gold Wing

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