Tuesday, 21 February 2012

One step closer

Well, I replaced the FET and cap, plugged it back in to the bike and... nothing. I'll admit I was disappointed. There was no voltage on the pump, meaning the FET was off. This can only be because it wasn't being driven, I knew the gate connection was sound, which only leaves the driver circuit.

To prove this, I tagged a resistor to the gate so that I could touch it to the incoming 12V and manually turn on the FET. Back on the bike, I cranked the engine and held the end of the resistor on the 12V pin (VGS max = 16V). After a while the engine fired up and ran as normal (it took some time to get the fuel through the system). So it's the driver circuit that's at fault...

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