1990 Johnson 120VRO Fuel Pump Issues

[chuckb]

"Last season my 1990 Johnson 1

"Last season my 1990 Johnson 120 VRO was experiencing fuel stavation problems. Died at mid to high throttle. I've attacked all the usual suspects (new lnes, filters, water spearator, anto-siphon, fresh fuel, etc, etc). This didn't help. So last ditch effort I've just rebuilt the fuel pump. Note: VRO is not used. Now runs dry after a few minutes on the muffs. I've put a clear line in place and there are no bubbles before death so I'm assuming I'm running on the bowls. Pumping the primer ball will bring it back to life just as it is coughing it's last breath.

It there a trick to setting the new diaphrams/pistons in the pump? Could poor compression or bad reed be a cause. Would simply using an electric fuel pump be the answer.

Any help would be appreciated. The grandkids are looking foward to fireworks over the lake this upcoming 4th of July.

Thanks in advance for any prompt responses................."

 

[dcramer]

"I'd make sure the pulse l

"I'd make sure the pulse limiter and line are clear. If they are, put your finger on the pump for a few minutes with the engine running. If the pulse motor is functioning, you'll feel a pop when it resets. If you don't feel a pop, check the pulse motor, spring, and reset valve. If you feel it pop, check the outer diaphram, nylon "wheel", and check valve diaphram against the wheel in the fuel pump section.

Dan"

 

[chuckb]

Thanks everyone for your sugge

Thanks everyone for your suggestions. Where exactly is the PULSE LIMITER located?