Water in fuel - test kit

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How to make a cheap water test kit

fully assembled

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Parts list

• 1/4" pressure gauge 0-15 psi
• 1/4" pressure gauge 0-100 psi
• 1/4" Y piece
• 1/4" Ball valve
• Bicycle "presta" valve
• 1/4" male stopend
• 2 x 43mm solvent weld access plugs
• 43mm solvent weld joiner
• Small plastic cap/cup
• Small marble
• Viton O ring

Instead of the presta valve and 0-15 gauge you can use a low pressure gauge designed for motorcycle forks which has a button for releasing the pressure total cost roughly £20

Assembly instuctions

• Put the plumbing together as in the photo with the low pressure gauge on the valved side
• Drill a hole in the stopend
• Weld both access plugs to the joiner
• Weld one screw cap on
• Drill two holes in the unwelded cap,one for the male stopend,one for the presta valve
• Fit the stopend through the hole into the Y piece and seal (i used araldite)
• Fit the valve using two of the round nuts that stop the valve creeping and seal
• Replace the rubber seal in the lid with a Viton one
• Glue the small cap to the inside about 3/4" down
• Drop in the marble

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• Click pictures to enlarge
• 

  Gauge assembled

• 

  Inside view

Ingredients

The reagent Dry solvent

This kit will work with Calcium Hydride (CaH2) and Calcium Carbide (CaC2)as the reagent,the Hydride gives a quicker result and produces more gas but is hard to source whereas Carbide is available from a well known auction site (£15/500g @4/2011 ) For a dry solvent you can use petrol,biodiesel or white spirits

The idea

The idea is that any water in the test liquid will react with the calcium and produce a gas,the pressure created is registered on the gauges The dry solvent dilutes the test liquid and allows any water present to get to the reagent quicker

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