90 fj how does fuel reserve switch work

[Harvy]

Hmmmm.... all very interesting.
I have full Dyna 2000 system on my '91.......OEM cdi disconnected completely (ie......no connectors plugged into it at all).

If I leave my fuel reserve switch in the on position, the pump does not run and she runs out of fuel -  I leave the fuel switch in the reserve position all the time.
When I turn the ignition switch on the fuel pump runs for 5 or so seconds and then stops...... I can switch of and back on as many times as I like and the same thing happens..... and it does NOT flood the carbs.
The only other consideration in this is that I do not have an OEM fuel pump either.

I doubt this helps the discussion, and the whole behaviour seems odd to me, but it works and it has never let me down, so that's the way its staying.

Cheers
Harvy

[ribbert]

 

Without doubt my favourite discussion over the last 5 years. Thanks for the chance to read it again.



Noel

[Pat Conlon]

Thank's Harvey, interesting observation..

I was surprised at Randy's answer...that he still uses the vacuum shut off feature of the '86 petcock with his fuel injection system.
My thinking was that when the key is turned on, the fuel pump runs and pressurizes the fuel rail and injectors.
I assumed this could not happen with a closed petcock.