Help! Fuel Pump Problems

[Brad Knebel]

I have a project I've been working on, pretty much old race kart frame I've been converting to a shifter kart. Gotten it to run but only when I prime the carb by pouring gas in. The fuel pump is on, using a vacuum line from the intake boot but its not getting enough gas on its own. It's a cheap $12 pump from eBay. Do I need a bigger pump? How many liters per hour? 1990 kx 125 engine, 5 speed. I've found pumps with 17, 35, and 55 liters per hour. I'm almost certain my current pump is too weak. Will a single outlet work, or do I have to have the dual outlet with a return line to the gas tank? Thanks for reading my thread and please help. *Brad K*

[Jeb Woods]

Get a round Mikuni pump or better yet, a pumparound system and carb that is modified for that system.
Also your pressure line should be plumbed into to the base of your cylinder not in your intake boot..
You should take a look at a kart that has a proper setup so you know how it works and you get the right stuff the first time!! If not, you will be in for some frustrating times..

[Jeb Woods]

Sorry, I have a correction, the pulse line is not located the base of the cylinder, its on the case just past the reed cage..