Carby Tinkerin

[Jackson]

G'day fellas, hows it going?

 

Here is my dilemma for this week.

 

I have a 4k motor in my Sierra and going up hills (more like steps, quarry walls, etc) I'm finding that my car is flooding, fuel is coming through the overflows and I have to hold it flat just to stop it from stalling.

 

So far I am thinking I may have set the float tangs wrong when I rebuilt the carb, though I did it to the specifications on the instructions. Otherwise I have read recommendations of using a low pressure electric pump instead of the mechanical one, not sure if this will solve the problem. Or I have been wondering the effects of just blocking the overflows?

 

Would appreciate anyone's input on this.

 

Thanks

[altezzaclub]

If you block the overflows it will push more through the jets I'm pretty sure!

 

You can buy adjustable fuel pressure regulators for about $50, which is what I use on the SUs. Mine set at about 1psi, 5 is the max I think. They might help a bit.

 

Overall I think its a carb design fault you have, and mayby a carb facing at 90deg would help. Webers DCOEs starve going around left-hand corners, and flood a little going around right-handders, or vice versa.. but anyway, its a common problem of g-forces not being vertical. If you turn the carb 180deg it will flood going downhill, that's probably better, but it might starve going uphill then.

 

EFi it!! :laff:

[oh what a nissan feeling!]

Its a common problem with carby fed 4wds, how soon it happens depends on the carby you are using.

 

Perhaps jump on one of those offroad sites and see if there is a particular type of carby people are having sucess with?

[Jackson]

I'm a member of Auszookers and some of them use the 4k carby's on their Sierra motors because they reckon they are better on angles :blinks:

 

I must have really buggered up the float level...