Fuel tank

  1. Memmeddu

    Memmeddu Member

    Messages:
    2,446
    Location:
    Italia Sardegna
    Hi everyone I need advice about making a small 2 litres fuel tank for a stationary engine (6.5hp lombardini)
    A friend of mine gave me a good 50cm piece of 100mm square box section
    I've to do the math to know how long should be considering the 2mm thickness and leaving room for little bit of expansion.
    I have to clean it inside prior to weld it .
    I has some rust spots inside .
    Outside it's little bit rusty but not a big deal.
    I would use a piece of 1" or bigger plumbing pipe as access to pour the gasoline inside, and a brass female cap to open and close the tank .
    I have to close the sides of the tank ,I have 2mm sheet metal .
    I don't know how to proceed if put it inside the square tube and weld it or if cut the sheet after performing a fillet weld .
    And on the other side I don't know what to do I was thinking to cut the box tube at an angle to have a bracket where to put a pump .
    The carburettor has a pump to fill the bowl when it's depressed and then released closing an hole with the thumb
    Or give an extra fuel injection to the engine for easier (flooding) start of the engine.

    Thanks in advance
     
  2. Memmeddu

    Memmeddu Member

    Messages:
    2,446
    Location:
    Italia Sardegna
    It has to be 225mm long
     
  3. hotponyshoes Member

    Messages:
    2,443
    Location:
    Somerset. Uk
    Cosmetically it would look good if you can cut/file the sheet so it fits nicely into the ends.
    Stick it in just enough to hold it in place then weld around filling the 'L' with weld.
     
    stuvy and Memmeddu like this.
  4. hotponyshoes Member

    Messages:
    2,443
    Location:
    Somerset. Uk
    Do you need room for expansion?
    I have always followed the thoughts that if you are parking a car or boat up for any length of time you brim the tank right to the top to stop any condensation forming?
    Plus you will have to fit a tank vent anyway.
     
    Memmeddu likes this.
  5. Memmeddu

    Memmeddu Member

    Messages:
    2,446
    Location:
    Italia Sardegna
    Safety reasons ,I will drill a vent hole through the cap , but here in Sardinia we easily reach 40°C and the tank would be very close to the cylinder head .
    I thought that wouldn't be bad but now that I'm thinking about the vent hole shouldn't be necessary
     
  6. hotponyshoes Member

    Messages:
    2,443
    Location:
    Somerset. Uk
    You will either need a vent hole or a valve otherwise you will just draw a vacuum on the tank as the fuel is used.
    You can cut part of the thread out of the filler cap and put a notch in the end of the filler tube if you like (like the top of a plastic fizzy drinks bottle)
     
    Memmeddu likes this.
  7. Memmeddu

    Memmeddu Member

    Messages:
    2,446
    Location:
    Italia Sardegna
    You misunderstood my words
    I've said that the room for expansion shouldn't be necessary because the vent hole.
    Which I think that I'll end up drilling a 2mm hole in the cap
     
  8. Memmeddu

    Memmeddu Member

    Messages:
    2,446
    Location:
    Italia Sardegna
    Currently work in progress I have to weld the caps after cleaning ,grind the weld on the pouring tube (galvanized it made me mad) .
    The barbed fitting it's soldered in place
    It shouldn't leak any gasoline
     
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    • IMG_20200716_123802.jpg
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    Hood, AndersK and Gragson like this.
  9. Memmeddu

    Memmeddu Member

    Messages:
    2,446
    Location:
    Italia Sardegna
    Finished today
    I'll upload images once painted
     
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