I am about to crawl under to install the Facet electric pump in the fuel line along the frame rail. Some have done this on the auxiliary tank line, switched by the tank selector toggle on the dash. Are there specific (...then connect the green wire...) instructions for hooking up the switch? I am nearly ignorant of circuitry, but this one ought to be easy, right?
Is the alternative to install the pump downstream from the selector valve, and wire a new switch on the dash?
Anything else I should know or do before the crawl?

Thanks.

Aux tank is the front tank, right?

I installed mine just in front of the selector switch. I ran the power wire to the glove box fuse block to a connection marked IGN. Whenever the key is turned to the RUN position, the pump runs. No need for a switch, unless you're leaving the mech pump in the line. I replaced all the fuel hose from the selector switch to carb, with all hose from pump to carb contained in a heat sleeve. Mech pump is still installed, but out of the loop.
If you're keeping the mech pump, it'll be far easier to install the electric pump in the AUX line, run the + to the selector switch power wire.


> Date: Wed, 6 Aug 2014 10:08:48 -0600
> To: gmclist@temp.gmcnet.org
> From: jeff.sugheir@gmail.com
> Subject: [GMCnet] Electric Fuel Pump Installation
>
[color=blue]> I am about to crawl under to install the Facet electric pump in the fuel line along the frame rail. Some have done this on the auxiliary t



Jeff when you get a chance you might want to add a oil pressure safety switch in series with the power to the pump just in case so the pump is turned off if the engine stops running for any reason.

well, the pump got temp install on the firebird to get it home, so it works.
But...the selector valve does not appear to be original, and has a single wire attached. It is not hot in either dash switch toggle position. I cannot find a hot terminal on the back of the switch in either main or aux position. I unplugged each of the wires on the switch, and identified the ones feeding the fuel levels for each tank. That leaves two wires , a red and a black, that appear to do nothing.

Is it possible that I have been driving without a functional tank selector valve?
Should there be a ignition hot wire to the toggle switch, that throws 12v down to the selector valve when in AUX position?
Should I ignore all this, put the pump downstream of the selector valve, and run it through an independent dash switch, that I can throw if VL symptoms appear?

Remember, its a GMC II, not much stock, most everything I have gotten into electrically has been hacked.

Thanks,

My electric fuel pump is installed after the selector switch, and is controlled by a lighted toggle switch under the dash (next to the similar switch for the auxillary vacuum pump). Both of these switches are wired to the ignition circuit so they're off when the coach isn't running. I like that because it gives me the option of running the aux. pump or not. I've found I really don't need it unless it's REALLY hot (the only time I had VL was after driving in 105 degree heat in stop-and-go traffic... when the engine stumbled, I hit the aux. pump switch and was running like a top again instantly).