Jump to content
HybridZ

Adding Triple Webers to the 240. What else do I need?


Recommended Posts

Upgrading the 71 Series 1 240Z to triple DCOE 40 Italian Webers. My car is pretty much stock. What is a must as far as parts/mods needed to run this set up? I'm new to these carbs and the set I have is used and I dont know their history other than they look to be in good shape from the outside lol. Came with a Cannon Intake.  Will I need a mandatory electric fuel pump, pump relays, oil pressure switches, fuel pressure regulator?

 

I read some posts here but everyone had a different car, some with pusher electric pumps at tank ect. Would like to keep it as clean and stock looking as possible as far as added wiring, switches and all that.  Also I read somewhere that there is different ways to route the fuel to your carbs. Would love some advice on this upgrade. Hope to have this build done in a few months after a long 5 year restoration.

 

Thanks in advance..

Link to post
Share on other sites
  • 2 weeks later...
49 minutes ago, 5 Star Rising said:

Do you know if a series 1 car has a fuel pump wire in the rear harness?


no. 240z’s utilized a mechanical pump. You will need to install a relay. The trigger signal for the relay needs to come from the “on” signs of your harness. Check the amperage of your fuel pump so you can match it to the relay rating. 
 

There are 2 types of fuel pumps for cars: high pressure for EFI (30-60psi), and low pressure for carbs (0-5psi). You want the latter. 

Link to post
Share on other sites
Posted (edited)

Right, I have been looking at the high capacity pumps 70 gph but 3-7psi. Someone had mentioned there is a blue taped up wire in the 240z harness in the rear that was not used. I was curious if that was on a series 1 car also, or just the latter cars. I know the 73 240z uses a "pusher" electric pump in the rear in conjunction with the mechanical pump up front so that one definitely has the wire in the rear.

Edited by 5 Star Rising
Link to post
Share on other sites
11 minutes ago, 5 Star Rising said:

Right, I have been looking at the high capacity pumps 70 gph but 3-7psi. Someone had mentioned there is a blue taped up wire in the 240z harness in the rear that was not used. I was curious if that was on a series 1 car also, or just the latter cars. I know the 73 240z uses a "pusher" electric pump in the rear in conjunction with the mechanical pump up front so that one definitely has the wire in the rear.


ahhh if the 73 had a pump near the tank, then I was just unaware. I still think you should run a new relay and wire since you don’t know what that amperage that wire was originally designed for. You could try, but you may heat up the wire or burn out the terminal/switch. 
 

I found the wiring diagrams from Haynes to be pretty accurate, so you could use that as a reference. Might give you the color of the conductor, and which wires it will be traveling with. 

Edited by AydinZ71
Link to post
Share on other sites

Doing a upgrade on a 72 . I would recommend what was said earlier , run a relay . I would get a T for your oil pressure sender and add a pressure switch and use it as the ground for the relay . I would pull power from the battery directly for the relay . I would run the pump 12v from the relay and tie into the green wire under the glove box . I don’t know whether I would use the ground back at the tank or just ground the pump at the chassis at the pump - probably the latter . 
I would order a fuel pump meant for an older carb engine like a Mazda rx7 . Summit carries a Carter that puts out 2.5lbs of pressure - perfect for triples and no regulator needed - 50$. 
Wouldn’t hurt to put a inertia switch in line with the pump for safety 

CB90D973-544C-4EF2-866E-F25EAF78840C.jpeg

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...