Fuel delivery issue

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lookupsayaw

Banned
Joined
Mar 9, 2011
Messages
45
I did post this before, not nobody replied. I think I am either getting too much fuel or not enough. There is a small crack on top of the fuel tank. Does that matter? When I try and start my motor(1964 Johnson 75 hp) it just back fires sometimes, it wants to start.
 
J

JWhit

Petty Officer 2nd Class
Joined
Mar 29, 2010
Messages
130
Re: Fuel delivery issue

i would not think that it would be a factor in terms of running, as the tanks are vented anyway to allow air in/out. the carb is adjusting that fuel/air ratio at the motor, so may need to look into that for issues
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,145
Re: Fuel delivery issue

Sounds like you need to check the spark timing. Maybe your's is too advanced, hence the backfire?
 
L

lookupsayaw

Banned
Joined
Mar 9, 2011
Messages
45
Re: Fuel delivery issue

how do I adjust timing. I mean it ran before.nobody has messed with it that I know of. Can timing change over time it is a 40 year old motor.
 
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