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overflowing carburettor

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overflowing carburettor
peterlikeman@gmail.com Offline
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Joined: Nov 2020 Posts: 6 Threads: 4
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Location: UK Wiltshire
Car type: 1934 Box
#1
25-11-2020, 10:36 AM
This is a stupid problem and never happened before but after going over speed bumps the carb 26VA has started massively overflowing and need to stop take off the bowl and pour the fuel have collected in tin underneath back into the tank. It is usually OK then till I get home. We have some fairly steep speed bumps in way I usually go out and try to avoid now but any ideas would be welcome. Peter
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Dave Prior Offline
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Joined: Aug 2017 Posts: 66 Threads: 1
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Location: Herefordshire
#2
25-11-2020, 11:17 AM
Sounds like the needle valve might be sticking.
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Roy Player Offline
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Joined: Aug 2018 Posts: 23 Threads: 3
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#3
25-11-2020, 11:57 AM
Hi 
Sounds like you need a new needle valve Available from ARP ltd tel 01202 625242
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Bob Culver Offline
dogged member, NZ
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Joined: Aug 2017 Posts: 2,748 Threads: 31
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Location: Auckland, NZ
#4
28-11-2020, 06:46 AM
Has the float sprung a leak and sunk?
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e-richard Offline
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Location: Surrey
#5
29-11-2020, 10:40 PM
You haven't by any chance recently fitted a new fuel pump ? I know it sounds unrelated, but there was a very long thread here some time ago on just this problem of overflowing Carb and the common cause was found to be a faulty pump spring.
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peterlikeman@gmail.com Offline
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Joined: Nov 2020 Posts: 6 Threads: 4
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Location: UK Wiltshire
Car type: 1934 Box
#6
30-11-2020, 10:16 AM
Thank you for the idea and I have got a spare pump but the one on the engine has worked fine up till now. I will replace the needlevalve as soon as I can get  a new one or try and find an entirely new carb. Peter
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Dave Wheatley Offline
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#7
30-11-2020, 07:20 PM (This post was last modified: 30-11-2020, 07:22 PM by Dave Wheatley.)
Assuming that the carb has performed OK up until the speed bumps, I would first fix the flooding - most probably the carb valve . A different carb will probably have different faults, and then what?
Make sure the fuel level is correct.
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