58' Evinrude Big Twin Fuel tank issues?

[thx997303]

When I got this motor, it ran well on the tank it came with. The tank is one of the Cruise-a-day pressure tanks.

I took the motor home and wanted to put it on my cuffs (which I'm glad to say, do work on this motor, unlike my other outboard) and make sure I was good to go for a fishing trip (which is in the near future)

Well, I can't get it started. I put the tank on the ground, hooked it up to the motor, pressed the primer button until I had pressure, then tried to start the motor.

It wouldn't start, and there was fuel coming out of the primer button on the tank.

I also noticed air bubbles coming up from around one of the bolts that holds the assembly to the tank.

I pulled the line, pumped the button until it leaked gas, then plugged it into the motor and tried to start it.

The motor fired a time or two and died.

I pulled the tank apart and the diaphragm is fine, the cork gasket is compressed but no obvious tears, and the little washers underneath the screws that hold the assembly to the tank are quite obviously shot.

Does this sound like the tank is just not sealing right? (IE, the tank is leaking sufficiently to not let the motor run. The tank is obviously leaking, but seems to hold some pressure)

 

[rjezuit]

Re: 58' Evinrude Big Twin Fuel tank issues?

The button only primes the carb. It doesn't pressurize the tank, it pumps gas to the carb. After the motor starts the pressure builds and that takes over. Try putting the tank higher, it might help if it is back siphoning and emptying the carb. Rick

 

[thx997303]

Re: 58' Evinrude Big Twin Fuel tank issues?

I know that, however, it appears to get to a certain line pressure, not tank pressure, and begins leaking everywhere. And then it continues leaking everywhere.

Has me a bit confused.

 

[thx997303]

Re: 58' Evinrude Big Twin Fuel tank issues?

I pulled the tank apart, put an o-ring under the primer button to increase the tension on the spring, made a new cork gasket for the base of the assembly, and put o-rings where the little washer seal dealies were underneath the bolt heads.

It holds pressure, doesn't leak and the motor runs again.