The protection diodes... the technical term is flyback diode. Was thinking about it after I posted. 1N4003 is a better choice as they are rated at 200v, not 50v like the 1N4001 which I normally use when driving relays from 5v logic levels.
 

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Title
Veg oil system control design help.
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Auto Electrician Forum
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Created
Wheresthedog,
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SparkyChick,
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