Quick question.

 

I understand that the accelerator pump, squirts fuel in the carby throat when the throttle is hit all of a sudden to counter react the sudden increase in air, this causes the car to not lean out.

 

What i want to know is how do i adjust it?

or is it even adjustable?

And should the pump work for any throttle position?

 

At the moment if i open up the first butterfly the pump is half way down, open up carby to Full throttle and the pump is fully down.

 

Just want to know is that how its supposed to be set up? reason I'm asking is i rebuilt the carby today (4k one) and by looking at the links, it designed to that if the pump stops at 3/4 throttle the spring mechanism allows the throttle to keep going.

 

Cheers

 

Dan

I’ve got 3 different K carb’s. One’s from a 4k, one from a later modal 3k (I think) and the one on my ke11.

 

The one on my ke11 has 4 different settings in the linkage for the accelerator pump adjustment.

 

The other two as far as I can see don’t have any other optional setting.

Can be done by bending the linkages and playing with the spring tension.

but how exactly does it need adjusting?

 

too much fuel, not enough? is the pump coming on too early? too late? too long?

 

I just figured ive gone to the extent to rebuild it, might as well having it working properly. I got the Toyota yellow book, and the gregory's manual, can't really understand on how its meant to be done

Read below, just over half way down the page.

 

Extract from A. Graham Bell's book "Tuning New Generation Engines for Power and Economy". A very good read.

Were chasing a big flat spot, so from memory we wanted it to pump earlier so we stuffed around with the linkages a bit and fitted a stiffer or longer spring (can't remember though) where the linkage hooks up to the lever that pushes down on the pump.

yes, but what i really want to know, is the pump there to work in all rev range, or just going from idle to slow speed?