SU carburetor(V8 Rover)???

[minesa240x3]

Hi everybody just wondered if i could be a bit cheeky and ask if anyone out there has experience with twin SU carburetors(rover v8)wouldn't normally ask about a non volvo problem but my mate has been very good to me lately and I thought i had fixed his recurring problem.
Thing is every now and then the carb on the offside pours petrol out of the overflow pipe?I told him to buy new float needle and seats,this seemed to sort the problem but suddenly it has started doing it again!The float float's(doesn't leak)
I just can't think what else it could be?
Poorly adjusted float??
Electric fuel pump to powerful??
The Rover V8 is fitted into a landrover(4x4)and i can't guarantee that everything is standard ie fuel pump.Any help would be much appreciated.

[m0bzy]

I don't want to think how long it is since I touched twin or triple Su's,you seem to have covered everything I would have suggested,it does sound like a sticking needle,I doubt the fuel pump theory,I would try a fuel system cleaner particularly if the car does not get used too often,vaporising fuel leaves an'orrible stickey residue.
Good luck
Mike

[mick2404]

Hi mate, i've got twin su's on one of my mini's....

When mine was overflowing it was grit in the float bowl.

Stipped it all down, cleaned it all up, blew the "fuel pathways" clear with an air line and i haven't had a problem since

If the fuel pump is upgraded, without a regulator you will find it will overflow, as they are only capable of a certain "gallon per hour" flow rate, you can get a suitable "filter king" regulator cheaply enough which will allieviate the problem for you...

http://minispares.com/Product.aspx?pid=35834

If you have any further problems let me know, as i've got strip down diagrams for "most" SU carbs.

HTH

Mick

[Brian M]

You could post this in the Amazon section - there are lots of us on there still battling with twin SU's, and a few experts as well.

[mick2404]

Amazon section???

Just like a helicopter, that flew straight over my head.... *blush*

[minesa240x3]

Thank you everybody.As m0bzy said i thought i'd covered everything,but experience is a wonderful thing, mick2404 cheer's for the regulator suggestion,my friend brought the landie already converted and of course not all part's are standard items(keeps you guessing though).
I will clean the system out and try a few thing's and get back to you cheers.
Would any of you know if the pump pass's excess fuel back to tank when it reaches max pressure(don't think they do)Clicking start's fast and slows down when ignition is first turned on but continues to click(sound's right but it has been a while)
Just thought! I wonder how level the engine is sat in the engine bay?The previous owner may have just thrown the engine in as best he could.Floats are set assuming the engine is fitted as per original level(TILT) ,just a thought?

[pookie]

I very much doubt that any excess fuel is pumped back to the tank by the pump. As an earlier post said it is most likely s**t under needle valve. Does it have plastic floats.

Pookie

[rubberduck]

Could be dirt or try inspecting the gap on each reservoir top.That is, see if the distance between top of float and needle valve is the same.S.U.carbs have a distance that is fairly critical to apply the correct pressure to the valve to stop overflow from chamber.Its a long time ago but we used to use a drill shank to set this with as s.u. recomended in their proceedure (i think it was about 3mm/1/8th).Other thing to try if not dirt is to re seat the needle valve by giving it a sharp tap on the end of the needle which re-beds the seating location.

[mick2404]

Originally Posted by minesa240x3

I will clean the system out and try a few thing's and get back to you cheers.
Would any of you know if the pump pass's excess fuel back to tank when it reaches max pressure(don't think they do)Clicking start's fast and slows down when ignition is first turned on but continues to click(sound's right but it has been a while)
Just thought! I wonder how level the engine is sat in the engine bay?The previous owner may have just thrown the engine in as best he could.Floats are set assuming the engine is fitted as per original level(TILT) ,just a thought?

Most of the standard fuel pumps rely on feed back to the tank from the carb, which you will more than likely find that the car will not have

Most carb cars don't need a feed back to the tank, as the fuel pressure is controlled by a mechanical pump, i.e. the quicker the revs, the more fuel it pumps.

As for the level in the engine bay, there are 3 different types of float bowl just for a standard HS4 carb, (as an example) and all have differing level's of "tilt" to allow fitment to different cars.

If they have a metal tag on the float bowl, there'll be a number on it.

go to www.burlen.co.uk and enter the number and it should tell you if this is the correct carb for the car.

HTH

Mick

[Stormy]

Originally Posted by mick2404

Hi mate, i've got twin su's on one of my mini's....

When mine was overflowing it was grit in the float bowl.

Stipped it all down, cleaned it all up, blew the "fuel pathways" clear with an air line and i haven't had a problem since

If the fuel pump is upgraded, without a regulator you will find it will overflow, as they are only capable of a certain "gallon per hour" flow rate, you can get a suitable "filter king" regulator cheaply enough which will allieviate the problem for you...

http://minispares.com/Product.aspx?pid=35834

If you have any further problems let me know, as i've got strip down diagrams for "most" SU carbs.

HTH

Mick

Hi, are these diagrams e-mailable please?? I have twin SU's on my V8 Cortina. I'm running a butterfly scoop with direct ram air onto 2 induction kits, onto Twin SU's from an SD1. I am rebuilding the engine at the mo and upgrading it, these diagrams would be handy.

Cheers.