fuel leaking nightmare

russell210276 · Renault 5 Driver Joined: 04 Jul 2012 Karma :

hi got a bit of a nightmare on my rg gamma fuel is pissing out of the over flow starting to piss me off removed the carb and everything in the carb at least 6 times today things i have done.

replaced valve needle from another mikuni carb i had seemed to have sorted the problem for 10 mins then it dripped this time ever minute or so air bubbles in the line aswell if that makes a diffrence Confused

set the float height to 25mm as per manual

checked the floats in water and seem ok they dont sink and no holes in them just float around.

cleaned carb as was due anyway

checked the valve float works by opening and closing the floats with my hand and i can go red in the face blowing into the carb it still doesnt leak till petrol is added the needle valve i put in was only used for a hour out of a brand new carb (chinky)

so now as we speak its filling the carb up as i can see through the petrol filter

i blocked off the second overflow which is half way up the carb and it pisses even more is that to do with anything?

many thanks russ

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

Is your new needle valve the right size? To short will flood the carb. Did you set the float hight with the tank touching the needle and not compressing it?

Scotsman37 · World Chat Champion Joined: 17 Aug 2004 Karma :

Maybe the carb's float valve is sticking nearing to close the fuel off so try and use some fine wet/dry sandpaper (roll the paper tightly) and twist it left & right a few times where the float valve slots into the hole and when finished with some carb cleaner/air duster to clean it out.

It's a good trick and it works !

russell210276 · Renault 5 Driver Joined: 04 Jul 2012 Karma :

i took both of your advice i checked the new valve needle against the old need and the new needle was slightly bigger about a few mm if that i changed back to the old needle because there looked to be nothing wrong in the first place sanded the pin and it been standing for the last 2 hours and running without a drip so many thanks too you both both of you get karma Thumbs Up

cheers russ

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

Glad you got sorted mate. BTW, If you carbs are Mikuni and you ever need parts this crowd are quite cheap and a good service.

https://www.motocarb.co.uk/index.htm

Scotsman37 · World Chat Champion Joined: 17 Aug 2004 Karma :

Well done!!