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levey
Carby flooding.
#1
No life (a.k.a. DattoMaster)
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One of my Dellorto DHLA 40 carbies keeps flooding, just wondering if anyone else has had the same problem.
The first time it happened I thought it was grit in the fuel, cleaned it out and it worked well, two days later ( after not starting the car ) it was flooding again.
I reset the float and it seemed fine again, then a couple of days later its flooding again! I checked the needle of course but noticed black marks on the inside of the fuel bowl, looks to me like the float is scraping/sticking on the inside of the fuel bowl.
The fuel is flooding the carby and also seeping out over the outside of the carby a bit.
Any advice would be appreciated, thanks.

Posted on: 2010/9/8 10:42
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Datsun 1200 2Dr sedan.
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ssskiwi
Re: Carby flooding.
#2
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DHLA carbs are really sensitive in regards to fuel level.

Check your fuel pressure, no more than 4 psi.
Check the needle and seat, any wear fit new ones.
Check the float level, really sensitive to this! Here is a good thread regarding setting an exact fuel level:

http://www.sideways-technologies.co.u ... .pl/Blah.pl?m-1201970113/

Posted on: 2010/9/8 10:48
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levey
Re: Carby flooding.
#3
No life (a.k.a. DattoMaster)
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Fuel pressure is 3psi.
Needle and seat look good.
I will double check float level, thanks for the link I'll check it out.

Posted on: 2010/9/8 11:04
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levey
Re: Carby flooding.
#4
No life (a.k.a. DattoMaster)
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Pretty sure the float is hitting/jamming on the side of the chamber, any other ideas people?

Posted on: 2010/9/8 14:23
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estyre
Re: Carby flooding.
#5
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could it be too much flow but the right pressure ?? if the pressure is the same then if you increase the flow i am guessing that it will flood

Posted on: 2010/9/8 14:51
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77 1200 ute
77mm bore a15 ,12:1 comp
ported and reconed h89 head
fairly aggro cam ,billet rocker spacers
twin 40mm solex carbs on bpro manifold
MSD 6al2 with 2 step limiter
4speed 60a box
hd clutch
2 inch exhaust
locked 4:11 ute diff
...
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estyre
Re: Carby flooding.
#6
No life (a.k.a. DattoMaster)
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could you run a bigger line from the pump to the carbys ,maybe that would help if it has something to do with flow ??

Posted on: 2010/9/8 14:53
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77 1200 ute
77mm bore a15 ,12:1 comp
ported and reconed h89 head
fairly aggro cam ,billet rocker spacers
twin 40mm solex carbs on bpro manifold
MSD 6al2 with 2 step limiter
4speed 60a box
hd clutch
2 inch exhaust
locked 4:11 ute diff
...
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ssskiwi
Re: Carby flooding.
#7
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If the float is sticking that will definately cause flooding, can you tweak the float to clear? The alloy is pretty pliable usually.

Posted on: 2010/9/9 0:04
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Deano
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tommo73
Re: Carby flooding.
#8
No life (a.k.a. DattoMaster)
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pressure building in tank over couple of days??????
raising above 3-4 psi?
crack fuel cap and see if still dose

Posted on: 2010/9/9 0:09
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taking up room at home
3 now 2 1200 sedans,3 now 2 1200 coupes,3 now 2 1200 utes
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ddiesel
Re: Carby flooding.
#9
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If everything measures to spec them maybe the float is loose on the pivot pin, wobbling around the chamber and snagging on the float chamber walls. Fix is to carefully remove pin and float and rework the section of the float that wraps around the pin so it is a tighter clearance fit on the pin. Then reassemble.

BEWARE - the float pin need to be tapped out with a very small pin punch while carefully supporting the one leg that clamps the pin. The alloy legs are mega fragile. Don't ask how I know.

Posted on: 2010/9/9 3:58

Edited by ddiesel on 2010/9/9 23:38:04
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ddgonzal
Re: Carby flooding.
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Extra "flow" fuel pump won't cause flooding.

Posted on: 2010/9/9 4:35
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