Any Weber Carburetor Guru's out there! fuel leak

[jaysparticus]

Hi All.

i am having a nightmare!!!

I should never have took my carb off!!
I have 1600 Xflow petrol engine in my boat - a watermota sea leopard and i have been having problems getting it to run smoothly. any way. i removed the carb to give it all a good clean out. i removed what associated parts i could and gave it a clean and rebuilt it and refitted. Engine starts first time everytime but runs really rough at idle. having read some forums i pin pointed it to a vacuum leak as all the symptoms were there. i removed the carb again to check the gaskets and this time the gasket between the spacer and the carb was soaked with petrol?? the gasket between the manifold and the space below didnt seem to bad. i bought a weber kit to rebuild the carb and followed a very good guid and rebulit the carb again.

i checked the float height for metal floats and set it to 40mm in the vertical position with it just resting agains the needle valve and i went ahead and refitted it to the engine.... Again i had a soaked gasket !!

What on earth could be causing this? i have checked the floats and they are sound. i have fitted a new accelerator pump and put the jets back in as normal the only thing wrong is the diaghram with the long spring on it doesnt hold very well. it the one where you can block a port and see if it holds..?

i am presuming that this is what is making my engine run so rough ? i cant see any visible fuel in the manifold so i dont think its flooding? how tight do the jets and stuff need to be ?

any help will mean i can get at least one trip out on the boat before summer ends!!

cheers

James

 

[essexboy]

You need to check that when checking the float level, (vertical ) that the float valve is closed, blowing down the fuel inlet will tell you if it is shut off. if this is a later carb it will have a "love device" lo vacuum enrichment, to stop engine stalling, might be leaking fuel into engine.

 

[gordmac]

Did you check if the carb and manifold mating surfaces were flat? I would expect there to be a thick insulator between carb and manifold. You may be able to check if there is a leak at the joint by wrapping tape round to seal it. Did you check if the centrifugal advance in the distributor is working ok?

 

[LittleShip]

Webber carbs have a tendency to froth the fuel. Does your carb have the Thackeray washers fitted, if so they are probably to tight.
A photo would help to see how it's all connected.

Tom.

 

[jaysparticus]

Hi Guys and thanks for the advice.

something must have changed within the carb when i have removed it and i cannot see what! i have replaced all the kit parts but stil no joy. the power valve diaphragm doesnt hold vacuum very well though.. could this cause a leak?
the only other thing was that the accelorator pump had an extra washer under it which i dint put back on as the guide i followed said it should have one above and one below..??

i have attached a couple of pics that i have available.