bmwe21.net forums

Hello ,

My vehicle is a 1982 320i M10 fuel injected
Manual transmission swap

I'm looking to convert to Carb side double Webbers, headers, and custom exhaust. Electric fuel pump and regulator

I would like to get all the information can , I have done a lot of searching but not a lot of precise information has been found.

some of the questions I still have:

-What happens to the emissions system, do I still use it? I don't have any emissions in my state.
-Does the fuel sender on the tank gets used?
-What happens to the Kjetronic (dme) does only control injection?
-Do you have to wire the electric pump into the key of the car?
-Do I need to install a choke ?

Hi! I’ll try to answer some of your questions.

You do not need the emission system anymore. Though it will be a best practice to install for instance a wide band lambda sensor with read out in the car so you can see whether the Weber’s are doing a good job under load.

You need the sender in the tank, but not the pump anymore. This is a high pressure pump and you will need a Weber specced low pressure pump for the carbs.

The K-Jet electronics can be removed, you do not have any use of it.

No, you never do that. You need to see the electricity that comes alive after turning the key as a kind of a signal. That signal powers a relay which powers the low pressure pump. The sender in your current car had already a pump, so you have already a relay so you can use that one. You need to integrate your new pump in the old wiring of the relay.

Choke depends on the carbs. I don’t know which ones you intend to use but generally there are three types of chokes. Water, which is automatic, electrical, which is automatic and manual, which isn’t. In case of the last one you need a Bowden cable to the interior to control it.

What will you do with the head? Plug the holes for the injectors or swap an 02 head?

I can provide an e21 4 cilinder carb head if wanted...

If I were him, I would source a 318i head.

I'm doing a similar conversion, so please clarify for me. Does the high volume/low PSI pump replace the inline pump, or the pick up tank pump? If it goes inline is the pick up pump just replaced with a pick up tube then?

Wilmo wrote: Mon Nov 30, 2020 5:05 pm If I were him, I would source a 318i head.

This sounds like a better route for our incoming 320i project.