Repair and troubleshooting information for the Suzuki FA50 Moped.

70 Questions View all

Drain nipple under carburetor leaks gas when throttle is turned.

When I turn the throttle my drain valve leaks gas at a tremendous rate. I've tried plugging it, but all that seems to do is cause my carb to become flooded.

What could be causing this...I've gone through a full tank of gas in less than half a mile. Also what house is the nipple next to the main fuel line for?

Answered! View the answer I have this problem too

Is this a good question?

Score 0
Add a comment

3 Answers

Chosen Solution

Nick, The only thing on the bottom of the carb should be the drain plug and the overflow. That is a drain plug, with an O-ring that seals the bowl. Take a look at the attached image and see if that is what leaks. The part number for that is 13278-02340 and it is readily available. The fuelcock assembly should not be supplying fuel in all positions. It is possible that the membrane/gasket on the inside is leaking by. I definitely would replace it. The part number for that is 44300-02262. I suggest to download the service manual for your moped from here. Hope this helps, good luck.

Block Image

The first image is the drain screw and the second one is the overflow. Normally there is a drain hose attached to it. Now here comes the real issue. Why is your carb overflowing? Check your fuelcock. It is activated by engine vacuum, so there is no cut off required. Sometimes the fuelcock diaphragm will wear out and allow fuel to flow to the carburetor when the unit is shut down, which will cause excess fuel to dump out the overflow tube. Replace the fuelcock would be the way to go. Also, make sure that the fuel lines are properly routed. You only use the Pri to prime the carb, to let some gas into the bowl. When you want to start the engine you switch it to on. Now lets say that it is hooked up right, fuel flows into the float bowl from the gas tank. After the fuel reaches a certain level, it elevates the float and closes the needle valve though which the fuel flows. If something interferes with this, the gas level will continue to rise and will overflow out of the overflow tube. It could be a few of these like either A) your float drain valve is open, or B) your float height is wrong or C) your float needle is messed up. you may just be do for a quick carb rebuilt :-) Hope this helps out. Good Luck.

Block Image

Block Image

Was this answer helpful?

Score 2

Comments:

Hey my scooter is leaking gas from the bottom out a little hole on the side of I don't no but I see a black line with springs around it going into a round metal thing at the very bottom

by

Add a comment

I took my carb off and cleaned it out. I found sand on the tip of the float needle. Got it all out and started it back up and it started leaking again. I checked the fuelcock and im assuming it's fine being that it didn't let any fuel out at all with it shut off. I'm sorta lost at this point and it's my daily driver so...lol. HELP!!

Was this answer helpful?

Score 0
Add a comment

It is also possible that something is interfering with the seal between the needle valve and seat. This could be foreign matter such as dirt or rust which has accumulated in the tank.

The fix for this particular problem would be to clean as much residue from the tank as possible, then disassemble the carb, cleaning both the needle valve and seat. Reassemble the carb and install a small universal fuel filter between the tank and carb. If the needle and seat assembly have not worn excessively, this should solve your problem.

Was this answer helpful?

Score 0

Comments:

@kwikrnu absolutely right. It has been addressed in the original answer as well.

by

My apologies if this was a breach of etiquette. I am new to the forum.

by

Add a comment

Add your answer

Nick will be eternally grateful.
View Statistics:

Past 24 Hours: 5

Past 7 Days: 62

Past 30 Days: 132

All Time: 1,858