• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

gasket question - carb

Share this page

JPSmit

JPSmit

Moderator
Staff member
Silver
Country flag
Offline
the more I think about it, the more I wonder if there is air getting past the carb causing it to not want to accelerate. I was able to speed it up today by increasing the throttle in the tiniest increments. Then it started to backfire in the carb.

I've just sort of assumed that you don't use gasket sealer at the carb gaskets - but now I am not so sure. can I use it? would it help?
 
Hi JPS,

Personally; I never used anything on the gaskets. Of course, Never had any problems like your mentioning.

I would check for a vacuum leak or something else where & see what you come up with.

I suspect if you did use a gasket sealer; It surely would`nt hurt anything.

Best Wishes,

Russ
 
A major learning lesson I had was the "smallest air leak" will make the carb spit and fart and all kinds of stuff. I used a new gasket and then followed it with the red gasket sealer. Occasionally, I will go back and check the mounting screws / nuts. I would seal it up.
 
thanks - so

carb - gasket - heat spacer - manifold

OR

carb - gasket - heat spacer - gasket - manifold?
 
John, I looked at my setup and the bottom of the carb has a gasket then I used additional gasket sealer "lightly" between to the spacer, and then again to the manifold. I use a fine painters brush to apply a nice thing layer on each piece. After it was bolted up I ran a nice layer with my finger around it just for a bit more security.
 
thanks - put sealer on - no difference - hope to ave someone over this pm to help - will keep you posted
 
have a friend coming tomorrow but in the meantime, had it running again tonight. checked the spark - blue like it should be. adjusted the float - again. runs but doesn't seem to have any vacuum at all (at idle) - I put my hand in front of the carb intake and - nothing. then of course I open the throttle and it still dies.

thoughts?
 
Have you tried hooking up a test vacuum gauge ?, that might help, on idle you should have over 20 (can't remember the actual units), but remember somewhere between 20/30 on idle.

Also I vote for "carb - gasket - heat spacer - gasket - manifold"
 
Had my friend over today - adjusted timing, adjusted float, adjusted a bunch of things and it runs much much better BUT doesn't seem to be getting enough fuel. If you let it idle for a minute and crack it, it revs fine, if you hold it, it dies.

I think the pump is fine but is there a flow rate I can check? (it is original and mechanical)

would the filter have clogged? (it's new)

lots of vent at the tank

thoughts?

Thanks


PS do check out the pics in a new post
 
Float needle issues.

Flow from pump should be approximately a pint a minute. No real way to test that, tho.
 
Back
Top