replaced gas tank

[r.shengle]

I've put a poly gas tank from the junk yard in the bow of our deep v-hull. It runs back to a 1980 235 Evinrude. I don't know if I've set it up right or not. I put an in line fuel pump instead of a bulb pump basically because I couldn't build any pressure in the bulbed line. Question is what kind of fuel pressure do I need to provide the motor and am I going to screw up the carb by using the inline pump without a pressure regulator?
thanx r.

 

[tashasdaddy]

Re: replaced gas tank

never connect an electric fuel pump to an outboard. extreme fire hazard.

1st question is there a vent on the poly tank and is it open? are you using an OEM or aftermarket fuel primer bulb. did you run the fuel line higher than the tank?

 

[r.shengle]

Re: replaced gas tank

10-4 on the fuel pump!! I'm sure there is a vent on the tank at least in the filler neck. I'll figure a way to plug it. I was using the primer bulb that came with the boat when I got it from granddad. How high the fuel line is could be of a concern, without going and looking at it it seems that it is at least as high as the tank setting level. Now when the boat takes off it'll be lower but I assume the pressure that gets built up in the line will hold till the boat planes out yes/no?

I can see the vent is probably my whole problem. Once the ice is all off the water here I'll do some plugging.
thanx r.

 

[Silvertip]

Re: replaced gas tank

There is no pressure in the fuel line after the engine starts. Remember, the fuel is being sucked through the line, not forced. Manual primer bulbs work best if held vertical when being squeezed. When held horizontally the internal valves don't always work well. The cheap bulbs are frequently problematic as well. I also agree that an electric pump on an outboard that has no way of activating a fail safe system (shutting off the pump if the engine dies) is a recipe for disaster. Consider a leaky fuel line where fuel is forced out of the line onto a hot engine or into the bilge. Again, the system was designed to "draw" fuel not "force" it.