20litres of gas in 30mins?

[Johndeere101]

I took my old 50hp Johnson out today. The motor hasnt been ran in atleast a year. I filled up my 20litre gas tank and hit the lake, i was gone for about 30mins and found i was out of gas. There are no leaks in the lines. Any ideas on what the problem is here?

 

[rodbolt]

Re: 20litres of gas in 30mins?

depending on the age of that 50 it sounds about right if you kept it at or near WOT.

 

[Johndeere101]

Re: 20litres of gas in 30mins?

oh wow really? This Johnson is a 1976. 30minutes doesnt seem like a long time to run on one tank of gas.

 

[rodbolt]

Re: 20litres of gas in 30mins?

on the two cyl version depending on prop,speed and load it sounds a bit much. on the 59 50 I used to ski behind, 6 gallons would not go far <br /> may be time for a major tune up to include carb rebuilding and fuel pump

 

[phatmanmike]

Re: 20litres of gas in 30mins?

your motor should use a smidgen above 5 gallons per hour at WOT, so you should use abut 2.5 or so gallons in 30 mins.<br /><br />im not sure about the conversion factor, but outboard arent really designed for fuel economy.

 

[BoatBuoy]

Re: 20litres of gas in 30mins?

If you used 20 liters in 30 minutes, that's about 10 gallons/hr. Wayyyy too much for that motor.

 

[Dunaruna]

Re: 20litres of gas in 30mins?

20 Litres is about 5 1/2 US gallons.

 

[BoatBuoy]

Re: 20litres of gas in 30mins?

Dunaruna, yea, but I was figuring per/hr., not 1/2 hr.

 

[itstippy]

Re: 20litres of gas in 30mins?

Start it up and watch for fuel leaks. Do not get nervous and have a cigarette while doing this.

 

[Dunaruna]

Re: 20litres of gas in 30mins?

Originally posted by BoatBuoy:<br /> Dunaruna, yea, but I was figuring per/hr., not 1/2 hr.

I didn't see your post when I posted. I was replying to 'myoutboards' comment about not being sure of the conversion rate.<br /><br />No harm, no foul.