Replaced fuel pump on golf cart, not getting full power to move cart forward or back

As long as you have fire, fuel and air to the engine it should run. Can you spray fuel into the carb and get it to start. May be a bad fuel pump.
Check the exhaust and make sure it is not plugged cause if so then the fuel will not get pulled into the cyl due to putting to much back pressure on the cylinder.

Spark plug, fuel filter, fuel pump, plugged air filter, Is there battery power getting to the coil while it's cranking? The ignition switch could be acting up.

Perhaps it's a stuck carburetor float valve, bad fuel pump (if it has one) or clogged fuel filter.

clean all contacts and switches,if it doesnt help,get new switches

has a short wiring going on grounding out somewhere.. trace your hot wires and make sure their is not bare spots anywhere.

Yes, the G16A is a Yamaha, petrol powered engine.

Check the following:

Spark plugs, leads and coil

Fuel filter, air filter, and fuel pump.

Also check your battery voltage.

Obviously no power to distributor or pump when key is turned on, check ignitin circuit and fuses related to pump and distributor

You may have this posted in the wrong product category. Please select another category appropriate to the problem and re-post the problem so the correct expert will see and respond to the question..
This is for car and truck problems.

sounds like a contact in the selector is dirty or the selector it self is bad

did you check the old pump?
were you sure that there was power to it?
i have run into this many times that people replace the pump without checking power?
so do you have power to the pump?
i have had a bad wiring harness or bad connection do this same thing. and when the fuel pump is removed the wiring gets moved around and make a connection again but not for long.
so chek power as close to the pump as you can