70 HP Johnson Fuel Pump

[mstritt]

I have a 1983 Johnson 70 HP and have a question about the fuel pump. There are three lines from the pump, one the gas coming in, two the gas going to the carbs and the third which goes to the bottom of the cylinders. I was wondering what the third line is for. Is it the cylinder check valve, can you check it and if bad does it drastically affect the way the engine runs?<br />Thanks

 

[steelespike]

Re: 70 HP Johnson Fuel Pump

That line is what makes the pump work.A pressure pulse moves the diaphram making the pump pump<br />gas.

 

[mstritt]

Re: 70 HP Johnson Fuel Pump

Is there anyway to check and make sure that it is working correctly? <br />Thanks<br />Martin

 

[awsome66nova]

Re: 70 HP Johnson Fuel Pump

HEY GUYS ITS been 8 years and no ONE has bothered to answer this question and IT COULD HELP OTHERS> LIKE ME>

 

[fmalott]

Re: 70 HP Johnson Fuel Pump

when i checked mine i took it off empty gas out used my mouth and blew through it and air was escaping rebuilt and no air escaped motor runs great
p.s. plug one hole and blow

 

[James R]

Re: 70 HP Johnson Fuel Pump

Remove the hose at the fuel pump end and blow down the pipe. If air passes through into the crankcase and there are no leaks at the hose all is well.
Prompts me to ask, why the question?