The Ford Barn

wadeyboy · 08-25-2023, 04:25 AM

I have a problem when fuel tap is on carb does not leak but as soon as I try to start it I have fuel pulsing out the float bowl vent hole. It never use to do this when been used 10 years ago when I was regularly using it
I have checked float as thought needle might be sticking , replaced gasket between bowl and top and cleaned carb out.
If its needlle valve sticking open would it not flood and fuel flow out into airbreather ?
Is this the reason when I try to start fuel is coming out vent hole.
It is thanks to Jeff in another post that I was able to establish my carb is a marvel.
Any thoughts would be much appreciated .Wade

Wick · 08-25-2023, 05:55 AM

Check your float,it may have a hole in it.

old31 · 08-25-2023, 08:15 AM

Also check the float were the needle valve rubs. Sometimes there is a divot, and this will make the float stick and leak. If there is a divot, sand it flat.

wadeyboy · 08-26-2023, 01:42 AM

not sure if it was right thing to do but last time it was out i put float into a bucket of water pushed it down and rotated it around. No sign of bubbles. This should Do the trick for holes in float?
I have carb out of car, i actually left fuel on last night and had fuel in tray under car this morning so proves i was wrong and needle valve is not cutting off flow which means i do have somewhere to start
I blew into the fuel inlet when i thought it was level and could not blow any thing through. tilted it so that float would be down and could blow through inlet. Again this to me would show needle not sticking, or would blowing be more force than fuel just running in?
so will recheck tomorrow to see if old31 answer may be problem as i did not turn fuel off last night and to day there was a pile of fuel under car in tray so guess needle valve did not close off , so will redo hole in float again
Any other thoughts much appreciated and many thanks

wadeyboy · 08-26-2023, 01:46 AM

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old31 , thanks for that, I have it out of car, will look at that tomorrow. i guess you can see my response to Wick above( i could of replied to you both in same post now i realize)
Anyway also thanks , and i will let you both know how I get on

08-25-2023, 04:25 AM	#1
wadeyboy Junior Member Join Date: Oct 2017 Location: auckland,New Zealand Posts: 7	marvel carburettor on my Model A I have a problem when fuel tap is on carb does not leak but as soon as I try to start it I have fuel pulsing out the float bowl vent hole. It never use to do this when been used 10 years ago when I was regularly using it I have checked float as thought needle might be sticking , replaced gasket between bowl and top and cleaned carb out. If its needlle valve sticking open would it not flood and fuel flow out into airbreather ? Is this the reason when I try to start fuel is coming out vent hole. It is thanks to Jeff in another post that I was able to establish my carb is a marvel. Any thoughts would be much appreciated .Wade

08-25-2023, 05:55 AM	#2
Wick Senior Member Join Date: May 2010 Location: Gwynn's Island Va Posts: 1,392	Re: marvel carburettor on my Model A Check your float,it may have a hole in it.

08-25-2023, 08:15 AM	#3
old31 Senior Member Join Date: Jan 2016 Posts: 2,103	Re: marvel carburettor on my Model A Also check the float were the needle valve rubs. Sometimes there is a divot, and this will make the float stick and leak. If there is a divot, sand it flat.

08-26-2023, 01:42 AM	#4
wadeyboy Junior Member Join Date: Oct 2017 Location: auckland,New Zealand Posts: 7	Re: marvel carburettor on my Model A not sure if it was right thing to do but last time it was out i put float into a bucket of water pushed it down and rotated it around. No sign of bubbles. This should Do the trick for holes in float? I have carb out of car, i actually left fuel on last night and had fuel in tray under car this morning so proves i was wrong and needle valve is not cutting off flow which means i do have somewhere to start I blew into the fuel inlet when i thought it was level and could not blow any thing through. tilted it so that float would be down and could blow through inlet. Again this to me would show needle not sticking, or would blowing be more force than fuel just running in? so will recheck tomorrow to see if old31 answer may be problem as i did not turn fuel off last night and to day there was a pile of fuel under car in tray so guess needle valve did not close off , so will redo hole in float again Any other thoughts much appreciated and many thanks Last edited by wadeyboy; 08-26-2023 at 01:50 AM.

08-26-2023, 01:46 AM	#5
wadeyboy Junior Member Join Date: Oct 2017 Location: auckland,New Zealand Posts: 7	Re: marvel carburettor on my Model A Sponsored Links (Register now to hide all advertisements) old31 , thanks for that, I have it out of car, will look at that tomorrow. i guess you can see my response to Wick above( i could of replied to you both in same post now i realize) Anyway also thanks , and i will let you both know how I get on