Tech Tips

How to Connect a Single Fuel Pump to a Keihin Carburetor for Karting Use

April 25, 2014

How to Connect a Single Fuel Pump to a Keihin Carburetor for Karting Use

The great debate lives on in the eWorld of karting.

What is the best fuel system to use on my Keihin carburetor and Shifter Kart?

I am not going to tackle that argument in this article, instead, I will explain to you how to hook up a single fuel pump to your Keihin carburetor.  Please note that SwedeTech does not recommend this type of a fuel system for a SwedeTech Stock Moto or Modified CR125 engine package.  SwedeTech recommends the use of the GFS (Gravity Feed System)

What you will need:

  • carburetor of your choice. Read your rulebook carefully
    • Mikuni Round Fuel pump
    • OR Mikuni Rectangle Fuel Pump
    • OR Dell'Orto Square Fuel Pump
  • Pulse Line 
  • Fuel Line 
  • Fuel Filter – Always run a filter before the pump
  • Rubber Mount – Optional


Step 1 – Make sure you have a pulse line installed on your engine. If you do not, install one. If you do not know how, call a qualified engine shop to do this for you.

Step 2 – Decide where you want to mount the fuel pump. Try to keep the pulse line as short as possible, while not interfering with any other components of the engine or chassis. The above optional rubber mount is a great way to secure the pump to the side of the engine.

Step 3 – Measure the length of your pulse line for ordering.

Step 4 – Measure the length of the fuel line needed to go from:

the go kart fuel tank,

to the filter

to the fuel pump

to the Y fitting

to the carburetor

AND from the Y fitting back to the return fitting on the gas tank.

Our explanation requires 1 supply line from the gas tank and 1 return line back to the gas tank. When you route the fuel line, you need to make sure that you have enough fuel line to allow for a free flowing route. You do not want tight bends or kinks in the fuel line. You do not want to pinch the fuel line when securing it.

Step 5 – Once you have the fuel line routed and connected to the carburetor, make sure you have enough fuel line from the Y fitting and to the carburetor to allow for easy removal of the carburetor for jet changes.

Step 6 – Make sure your carburetor is vented properly. The lower overflow nipple in the bottom of the float bowl must have a piece of fuel line long enough to allow for an upward route above the carburetor.

Step 7 – Run the engine and take the kart on the track. You may need to adjust float levels for proper performance.

*** WE DO NOT OFFER TECH SUPPORT FOR THIS TYPE OF FUEL SYSTEM PLAN. SwedeTech recommends the GFS. *** We have done ample testing and at this time this is the best fuel system for the current rule structure.