Need thingy for Yamaha

Talking of odd fuel pumps - Boxerboy of this parish: his son had a
Malaguti scooter. That had a fuel pump that was entirely mechanical,
operated (believe it or not) by the movement of the swinging arm.

As long as you were riding it, the suspension moved and pumped fuel. If
you were motionless, like at traffic lights or whatever, there was more
than enough fuel in the lines and float bowl to last a very long time.

But he didn't know this.

Came the day when some surgery was being done on the bike, and he
couldn't figure out why no fuel was geting through.

Solution: bounce up and down on the seat.

 

My first on-topic thread ever, and it gets hijacked into a car thread.

I used to keep a hammer in the boot of my Mini for wacking the fuel pump
back into life. One could just take the top off and tweak the points
though. I seem to remember they were adjustable.

 

Clearly the correct answer.


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Some fuel pump relays provide a fixed period (5 seconds?) of power to the
pump, as soon as the ignition is switched-on and before the engine is
started. This is connected to an interlock that means, at all other times
the pump is only powered when the engine is running.

The time is meant to be enough to prime an empty fuel-line and carbs.

This could be described as "providing a pulse to the fuel pump" but not all
the time.

 

Dear fucking god.
Only the Italians, eh.

 

The thing is, tuppence worth of war surplus transistors and resistors
could have made it reliable as the Sun coming up.