Mark 15/tank Fuel System Help please!

[Kiekhaefer]

I picked up this Mark 15 and original gas tank on eBay. The previous owner had replaced the dual line with a primer bulb line and installed what looks like a little fuel pump made in Japan. I'd like to convert this motor and tank back to the pressure valve and dual line tank.

My question is: Does this look possible with the pressure valve cover that's on there now? I don't really know anything about the old system so I don't know what it's supposed to look like. It seems to be a conversion done by someone. I looks like it's taking air from the crank case and directing it to the little fuel pump. How do I do this? Remove the fuel pump and re-hook up the air line? Then direct fuel line to the carb?

I do have the original fuel connectors on the tank and the engine.

Also, I'm apparently missing 3 washers from the pressure relief button mechanism. Should it be one rubber one and 2 different sized brass ones on either side of the rubber one?

Is there an aftermarket old style fuel system somewhere?

Thanks in advance.

 

[Fuzzytbay]

Re: Mark 15/tank Fuel System Help please!

I am not sure what you need for your primer pump. To reconvert the motor, (third picture)simply remove the left line to the carb, and hook that up to your fuel supply line. Take the air line and hook that up to the line coming from the motor block, (it goes in the side of the fuel pump). The pressure systems used air from the engine, to creat pressure in the gas tank, and this pressure pushes the fuel into the carb. Not the best sytem, and if used improperly, can cause fuel to spill from the motor on hot sunny days, or as some have said, explosions too (never seen or heard of one myself).