I am getting ready to install the electric fuel pump. The plan was to use a triggered relay instead of the oil pressure switch(hideous with the "T" adapter).
Has anybody done it this way?

 

I thought only Chevy Vegas came with the oil pressure/fuel pump so I don't blow up my engine switch.
Put it on a relay it will work fine.

 

I've never used an oil pressure switch either. Always wired it through a keyed source or toggle switch (depending on application) to a 30a relay.

 

oil pressure switch was used as a safety switch in case of an accident.

I was thinking of using a trigger relay that hooks up to the coil or tach. We used to put it on VW engines.

I know it works with points. distributor, what I don't know is will it work with MSD.

 

It would seem to me that so long as it is wired to any connection that loses power when the engine dies, no matter what position the key is in, would give you the same safety factor as the oil pressure switch?

 

Yes. But if it's wired to the ignition, like most people are doing it, it will stay on.
Which connection loses power when engine dies?

 

The alternator is all I can think of. You can use this for the fuel pump instead of the choke:

 

The relay I am talking about is triggered by the distributor.
The way it works is perfect for fuel pump.
When you turn the key there is a connection for 3-5 seconds, enough to fill the bowls on the carb. If it doesn't get the pulse(ignition ON engine OFF) it will shut off until the engine is started.

Its the off/on timed pulses from distributor that keep timer circuit in relay triggered ON, that keeps relay turned on. If timer circuit in relay does not see timed pulses from dist/coil it thinks engine is stalled or off and turns off relay (power to fuel pump).

i hope this makes sense.

 

Just me, but I don't like loading my distributor signal. I'm not saying it's wrong.

 

It's hooked to the negative on the coil just like the tach.