[DML] Re: Contemplating a Carb Swap
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[DML] Re: Contemplating a Carb Swap

The inertia switch is one of the world's worst switches (IMHO). It makes very poor electrical contact by design (the weighted ball inside has to be able to break contact just by rattling around). Hence the melted inertia switch harness connectors you sometimes see.

The circuit after the switch also is inadequate (IMHO). The inertia switch is ganged with everything else in front of the driver, including the windshield wiper motor, then routed to the rear bulkhead bolt on a single 12 gauge wire.

Altogether it is an unfortunate design (IMHO) that carbureted owners can jetison because downdraft carburetors won't work upside anyway -- no need for the inertia switch. You can leave the switch in place to trigger the door lock module, but ground the pump directly to the frame/ground bus/etc. You've still got the RPM relay to turn the pump off in case the engine stops turning while rightside up.

The electric motors in Airtex brand pumps seem to be particularly susceptible to bad grounding.

Bill Robertson

--- In dmcnews@xxxxxxxxxxxxxxx, stevedmc@... wrote:
> Make sure you have a solid ground connection going to your fuel pimp.  I killed two low pressure fuel pimps (carburetor) due to what I believe was a faulty ground connection.  I ran a new ground connection about a year ago and  nearly 10,000 miles later I haven't lost a fuel pimp.  
> --
> Steve


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