I have triple Mikuni 44 on my 1973 Datsun 240z, I would like some recommendations for brand of electric fuel pump that works with these Mikuni carb.

Thank you for any help!

Ron

Edited September 14, 2024Sep 14 by yippi427
Update listing

3 hours ago, yippi427 said:

I have triple Mikuni 44 on my 1973 Datsun 240z, I would like some recommendations for electric fuel pump that works with these Mikuni carb.

Thank you for any help!

Ron

You could use a Holley red - https://www.holley.com/products/fuel_systems/fuel_pumps_regulators_and_filters/fuel_pumps/carbureted_fuel_pumps/carbureted_electric_fuel_pumps/parts/12-801-1

It would have enough flow. You should monitor the fuel pressure to determine whether or not you need a fuel pressure regulator to reduce the fuel pressure at the carburetors. You will need to mount the pump near the gas tank.

The next thing to determine is whether or not the wiring is in place to power the fuel pump. Are you ready for a series of questions?

Hi Ron, 

Mikuni 44's don't need anything special.  They are sensitive to inlet fuel pressure though.  So, if you haven't one already, plan on adding a fuel pressure regulator and setting the inlet pressure between 3 and 3.5 lbs.  Regarding the pump: I recommend this Nissan Motorsport one:  Electric Fuel Pump 17010-RR010.

Mounting bracket info (to mount the pump near the tank:
https://forums.hybridz.org/topic/124530-nismo-fuel-pump-install-help/

Also, there is wiring already on the car to utilize to hook up the pump electrically.

There are various ways to route fuel for the carbs.  I used a method that circulates unused fuel back to the tank and incorporated an Aeromotive fuel pressure regulator, but there are less expensive options.

Edited September 14, 2024Sep 14 by inline6

1 hour ago, inline6 said:

Also, there is wiring already on the car to utilize to hook up the pump electrically.

The wiring is there in the back, but depending upon what has been done to the car over the years, getting power to the pump may be an issue.

I would look around the forward console area for something in the wiring harness wrapped in blue tape. In my 71 240Z it was in the wiring bundle on the right side of the console going to under the dash. I've seen pictures on these boards where it's more like around the left side of the radio body. If you find it you should be able to jumper across the plug, like take a piece of wire and put one end in one side of the plug and the other end of the wire in the other side of the plug. This should give power to the leads that are dangling somewhere near the fuel tank when the key is in the run position. I would maybe recommend an inertia switch in that jumper loop to cut power in the event of a crash and the driver is incapacitated.

6 hours ago, w3wilkes said:

I would look around the forward console area for something in the wiring harness wrapped in blue tape. In my 71 240Z it was in the wiring bundle on the right side of the console going to under the dash. I've seen pictures on these boards where it's more like around the left side of the radio body. If you find it you should be able to jumper across the plug, like take a piece of wire and put one end in one side of the plug and the other end of the wire in the other side of the plug. This should give power to the leads that are dangling somewhere near the fuel tank when the key is in the run position. I would maybe recommend an inertia switch in that jumper loop to cut power in the event of a crash and the driver is incapacitated.

But since it's a 73, it may be wired with the field modifications. That's why I want to get the OP to answer some questions about his car as opposed to throwing out a bunch of things.

Thank you for your input I have located the wiring by the fuel tank. I have had 2 Holley Red fuel pumps on my boat and the Holley pump will be too loud for my 240z.

Hi SteveJ, what questions would you like to ask about the 240z.

3 hours ago, SteveJ said:

But since it's a 73, it may be wired with the field modifications. That's why I want to get the OP to answer some questions about his car as opposed to throwing out a bunch of things.

I would have thought if those field modifications had been made the car would already have an electric pump.

1 hour ago, yippi427 said:

Hi SteveJ, what questions would you like to ask about the 240z.

We need to determine if the field modification was made to the car and whether or not you have an internally regulated alternator.

Field modification:

Do you have one or more of these items?

1. An electric fuel pump mounted at the gas tank
2. The relays indicated in the drawing below (Look for the ones where I drew the arrows.)
3. A wire branching off the black/yellow wire at the starter solenoid (Sorry, no picture available)

Does the car have the stock alternator and voltage regulator? The voltage regulator is mounted to the passenger side fender near the alternator. If your car has the field modification, you should see the VR plugged into a 6 pin connector, and that has a short length of wire going to the engine harness. 

If you have both the stock alternator/VR and field modification, you have everything ready to wire up your electric fuel pump. If you don't, we can help you with Plan B.

I have changed the alternator to internal regulator alt. Bypass external regulator.

Do you have the field modification for the electric fuel pump?