In a car it is not always done but is preferred if you have an accident killing
the ECU also kills the pump..Switches that will reliably switch 10 to 15 amps
are large and expensive as well compared to the relay.
Dave
Dana wrote:
>
> Hi all,
>
> My EFI schematic (MegaSquirt) calls for a fuel pump relay which "talks" to
> the EFI system. I'm assuming it's so that the high current (10A fuse)
> doesn't pass through the circuit board. There's also a priming circuit for
> starting.
>
> My question is this:
>
> Do I really need a fuel pump relay, or can I just switch the fuel pump on
> prior to starting, and off when done, making sure I use a properly rated
> SPST toggle switch on the handle bar (I'll also have f/p on/off in series
> through the dead-man switch).
>
> Seems simple to me, and I can't see why the EFI needs to know the state of
> the fuel pump for LS.
>
> Dana
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