My car often sits for a long time and the carburettor bowl dries out. When this happens the float bowl arm and the needle valve jam in the open position so that the carburettor floods when I start the car again. I am thinking that if I bend the float bowl arm I may solve the problem. I realise I then have to set the lower part of the arm to give the correct fuel level in the carburettor bowl when full.Has anyone else had this problem and how did they solve it?
Trevor
Please visit the Club's website https://www.dloc.org.uk/ to join. Visit https://www.dloc.org.uk/adhoc to DONATE towards the cost of the forum.
Please don't post someone's email address to avoid it being harvested by spambots and it's against GDPR regulations.
Always look at "ACTIVE TOPICS" to see all posts in date & time order as they are sometimes moved; or look at "Your Posts".
Please add Reg. nrs. when posting a photo or anything about a car as this will help searches. Don't add punctuation next to nr. as this negates search.
CHANGED YOUR EMAIL ADDRESS since registering?, click your username and check your address in User Control Panel, Profile, Account Settings.
If you want help to register, use "contact us" at page bottom for help.
Please don't post someone's email address to avoid it being harvested by spambots and it's against GDPR regulations.
Always look at "ACTIVE TOPICS" to see all posts in date & time order as they are sometimes moved; or look at "Your Posts".
Please add Reg. nrs. when posting a photo or anything about a car as this will help searches. Don't add punctuation next to nr. as this negates search.
CHANGED YOUR EMAIL ADDRESS since registering?, click your username and check your address in User Control Panel, Profile, Account Settings.
If you want help to register, use "contact us" at page bottom for help.
DB18 Carburettor Flooding
Re: DB18 Carburettor Flooding
I seem to remember that there is a setting on the SU carb for the arm that operates the needle and float relationship. I remember setting it with a drill shank on my first SP. I may be well out but seven sixteenth’s rings a bell. It may be worth checking as if it ain’t right it may be dropping too far.
Colin,
I may be slow but I’m rough as well !
I may be slow but I’m rough as well !
- captain bobo
- Posts: 268
- Joined: Tue Feb 09, 2016 7:32 pm
- Location: Kimbolton, Cambs
Re: DB18 Carburettor Flooding
I can refer to my SU carburetter service manual if it helps for the relevant dimensions. However, I'd need to know the SU model number.
Best wishes, Dave B
-
- Wise Man
- Posts: 503
- Joined: Thu Mar 10, 2016 10:02 pm
- Location: Sydney, Australia
Re: DB18 Carburettor Flooding
Hi Trevor,
Why not just start the car up regulary to,keep fuel in the bowl or just prime it with the fuel pump?
Cheers
Peter Grant
Why not just start the car up regulary to,keep fuel in the bowl or just prime it with the fuel pump?
Cheers
Peter Grant
-
- Extremely Wise Man
- Posts: 1369
- Joined: Sun Feb 14, 2016 11:15 pm
- Location: Aberystwyth Wales
Re: DB18 Carburettor Flooding
Hi Trevor. I may be barking up the wrong tree but I had the same problem with my SP250.
It stood for a year during some family problems, I started it every few months and the float valves stuck, when I stripped the carbs down both valves were sticking because there was a sort of soft corrosion on them. I cleaned them off and they worked OK till the next time.
I put it down to what goes for modern petrol.
When I bought the car it came with a large bottle of Redex which ran out, I have since started using it again and have had no further problem.
Might be the answer to your problem, but I have to say my V8 250 has never suffered the same problem.
It stood for a year during some family problems, I started it every few months and the float valves stuck, when I stripped the carbs down both valves were sticking because there was a sort of soft corrosion on them. I cleaned them off and they worked OK till the next time.
I put it down to what goes for modern petrol.
When I bought the car it came with a large bottle of Redex which ran out, I have since started using it again and have had no further problem.
Might be the answer to your problem, but I have to say my V8 250 has never suffered the same problem.
Re: DB18 Carburettor Flooding
Now I have the car running again I tackled the problem of the flooding carburettor. At first I tried bending the arm that controls the float valve.That didn't work. Then I bought a new valve but that made it worse as the valve was smaller in cross-section than the original and kinked worse. Finally I got hold of and old carby from a friend and swapped both the valve and the float, reset the arm and solved the problem. I think the problem was either the float (although the old one seemed okay) or the rubber tip on the old valve that had been affected by modern fuel. The replacement valve has a metal tip.
Trevor
Trevor
-
- Posts: 219
- Joined: Mon Feb 15, 2016 1:07 pm
- Location: Wiltshire
Re: DB18 Carburettor Flooding
I had a similar flooding but it happened when running, I initially thought it was the arm but resetting made no difference.
I then replaced the needle and seat, as there was wear on the needle, no improvement. I then re-adjusted the setting arm (as per the manual). This failed to cure the problem.
It was finally traced to the float being full of fuel.
A replacement float, arm and pin, then correctly set (with the new needle and seat seems to have cured the problem. Burlen Fuels provided all the bits and their website is great for instructions. It also allows you to enter the type of car so you can ensure you buy the correct parts.
Hope this helps?
Mark
I then replaced the needle and seat, as there was wear on the needle, no improvement. I then re-adjusted the setting arm (as per the manual). This failed to cure the problem.
It was finally traced to the float being full of fuel.
A replacement float, arm and pin, then correctly set (with the new needle and seat seems to have cured the problem. Burlen Fuels provided all the bits and their website is great for instructions. It also allows you to enter the type of car so you can ensure you buy the correct parts.
Hope this helps?
Mark