Well it's hooked up but aint running very well. I'm not sure I've got the float bowl settings correct, as at first there was no fuel going into the bowl.. So I took it off and bent it out further till fuel started pouring through.. put it back on and nothing, no fuel getting through still. So I kept bending it out and eventually fuel starting getting into the bowl, but not enough..

I took the fuel line and poured fuel straight into the bowl till it was full.. put the cap back on and it started, ran for a little while and died (fuel starvation I'm guessing). So I'm not sure what to do.. The float level is bent so far out it should fill up qiuckly, but it just doesnt seem to.. Originally I set the float to what was perscribed in the manual, which didn't work.

Anyone got any ideas?

Well if you have set it to what the manual said and you could'nt get fuel i would be checking the fuel pump, take the fuel line off and stick it into a container and see if there is fuel comming out

Jon

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

Fuel pump is fine.. I took the float bowl lid off and cranked the engine over to pour the fuel into the float bowl.

Maybe a silly question but are your idle screws screwed out?

Did you replace the internal pump diaphram (underneath the dellorto)? if so is the spring placed on the pump working?

Have you hooked up the fuel line feeder nozzle thingy (above the dellorto) in the right way? you can get that wrong so that no fuel will come it, or it will drip out loads of fuel.

Try setting the idle speed screw allt the way in so that it's at a relatively high setting to start off with.

If you don't know what I am on about, I'll come over this weekend to check it out for you if you want

Or call me I can come by tonight to Redfern *scary thought*

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Lillee - 1969 Morris Mini K

Yep I tried these on a few settings, left them at the setting that I manage to start it on (fairly fast).



Replaced both the pump diaphram and spring..


Yep this should be correct, I put it back the way it came off, I tried it the other way but it didn't seem posible to fit it that way.

Try setting the idle speed screw allt the way in so that it's at a relatively high setting to start off with.

Hahah yeah better becareful! I have to walk to work soon, so I won't be home tonight.. thanks for the offer though

Well anytime, no worries. You have my number...

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Lillee - 1969 Morris Mini K

If the fuel pump can not fill the bowl when the carb has its top on there is something wrong with it, it only takes about 2.5 pounds of pressure to open the need;e valve, when you had the top off how did you set the float level, did you turn the carb top and float on its side and measure the distance from the top of float to the underside of the cover, it should be about 12 mm with the needle valve closed and the float making light contact

Jon

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

Tested the fuel pump.. it's fine. It could fill up the su float bowls easily enough.. How full should the float bowl be when I take the lid off.. I've got it filling up but only to about 1/3 of the way.. Should it be higher then this?

Sounds about right maybe a little low but not much, set your float level as per the manual your problem lies elsewhere and float level has nothing to do with how fast the carb fills with fuel, have you set the pump stroke at the right level on the accelorator pump, also check for air leaks around the manifold and between the carb and manifold your initial posting where you have filled the carb up and basically flooded the hell out of it would seem to indicate you have to much air ingress some where

Jon

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

You lost me here


I had a look, cant seem to find any air leaks.. It's a brand new manifold.

I've been out there fiddling with it all morning, until I ran the battery flat. I threw the SU's back on as I had to drive somewhere, but I'll have another go at it tomorrow.. Thanks for your help!

The accelarator pump is on the bottom side of the carb, the length of stroke and where it starts from is determined by where you have the shaft and pump arm set, to high and the thing will not pump fuel and to low its all over before the butterfly is open, check the gasket or rubber mounts between the carb and manifold are not damaged, that the seal on the brake vacuum takeoff point is good

Jon

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

Cool, thanks Jon! I adjusted the arm and it's now happily idling away. But I've got another problem... If I try revving quickly it sounds like it chokes and almost cuts out.. But if I accelerate really slowly it's ok.. This is making it completely undriveable.. Could this be due to the pump stroke being too low? I know the mixture should become slightly rich under acceleration, so I'm guessing it's not getting enough juice.

I'm using 7772.5 emulsion tubes. Maybe I should have got the .6's?

I am glad its running, yes it could be that the pump stroke is wrong still, adjust it so that the pump is working from the moment the butterflies start to open

your emulsion tubes should be spot on and they wont effect initial pick up from idle, up untill about 2500-3000 revs the car will be running on the idle jets so any problem with initial pickup from idle will either be the pump stroke or the pump jets fitted, if the emulsion tubes are wrong it will show up when the traansition from idle jets to mains happens and it faulter at about 2500 revs or a little more but the 7772.5 are the prefered tubes and hang on to them as they are no longer available from what I have heard

Jon

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

You can't use it like an on/off switch as you can with an SU, but it shouldn't be that bad.

You may be flooding it instead of starving it of fuel.

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

Sorry to disagree but a weber or dellorto is infinitely more tunable than any SU and if you reckon you cant nail them from idle you don't know how to tune them, ask Alpha,Fiat, Ferrari, Lambo and the many others who have them as standard equipement, if your cam is not so big ya cant jump over it its quite easy to tune a weber/dellorto to be very good straight of idle, its really a shame that most tune shops and dyno operators in this country can't get them right, being that you can change just about every part seems to confuse most who don't know what bit effects what because all they ever learnt was on toyo kogo or stromberg/carter or the like

Jon

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van