Has anyone come across a fuel flow switch that simply triggers when there is fuel flow at all? Not looking for a flow SENSOR like the Aquamist unit, just something that can let me know that fuel is flowing at ALL. It ould be for denatured alcohol (50% ethanol/50%methanol).

 

Have you tried McMaster Carr?

http://www.mcmaster.com/

Do a search for "Flow switches". A ton of stuff comes up.

 

I have actually, and www.mscdiret.com and www.grainger.com as well. I just didn't want to go the wrong direction with a product when someone might know of a cheap easy solution already.

 

I use this. It works well. I don't think I paid that much though...
http://www.coolingmist.com/detailmain.aspx?pid=05

Basically I have it set up as a pressure switch. I have a solenoid then a hose, then the injector. Between the injector and the solenoid I put this pressure sensor. When pressure raises to like 5psi (my system is pressurized at 150psi) the light comes on to indicate there is flow. Works well.

 

Unfortunately, my setup is with a fuel injector and always has pressure. I have a HOBBS adjustable pressure switch set to 5psi lower than the systems static pressure to alert me if there is a loss in fuel pressure. The quest for a meth/ethanol safe flow switch continues,lol.