Steve wrote:

I really don't want to move it but there is no way to adjust the
senseativity.. The main bilge is where I would most likely get vapor from
gas or propane, when I have it aboard.

Well, you could always wire the power supply so that the detector is
"off" when the engine is running.

What kind of air supply and ventilation is provided for the engine
compartment? You could also remount the sensor so that it is in "fresh
air" being drawn to the engine when it is running. It sounds like there
isn't much air flow around the sensor even when the engine is running.

You could route an induction hose from the engine air inlet to a low
point in the bilge. That would provide positive ventilation for the
lower bilge so that you might never reach LEL in the event of all but a
huge leak. Put a "suck-in" door in it up high so that a flooded bilge
won't choke off the engine.

Just a couple of ideas not based on seeing the installation ... they are
worth what you paid for them.

I'm sorry now I ever even installed the thing.

Sometimes having too much information can be problem. 8-)

I used to fly mail across the mountains of Montana in the middle of the
night and we used to talk about what we would do if we were ever forced
down in bad weather. The concensus was that we would turn on the landing
lights until we saw something we didn't like then turn them off.

What you don't know will probably kill you but at least you won't be
worrying so much about it.

Rick