I have a Air Dog 100 and I finally got my FP gauge hooked up today and while I am sitting at idle with 1/4 tank my FP will fluxiate between 0 and 13 #. Why does it do this, anyone have any idea?

 

sounds like yer purgin air from the system

mechanical or electric gage????

 

Were did you tap into the line to put your isolator?

 

Mechanical gauge, line is tapped at the CP3. I never did fill the FP line with any type of liquid between the FP gauge and the isolator, its all air, but I do not think that would cause such a fluxiation in the reading.

 

If it is to close to the pump it will cause it to jump and you really need to pump antifreeze in it to make it read acurate, it needs the resistance I was told when I did mine.

 

Its as far from the pump as it can be, its on the CP3. I guess that I will pump antifreeze in it some time, I never had a problem with it with the stock pump.

 

On my 24V mine was t-d out of the supply line with an 18" line before the isolator. If it is to close to the pumps it can get pulses in the fuel guage from the pump, at least on the 24Vs.

 

Mine is out of the CP3 with a 36" line to the isolator.

 

I added some more fuel and it quit doing it, I guess that I need to drop the tank again and look at the draw straw.

 

Make sure you get the straw about 3/8" from the bottom of the tank. Any closer than that and you run the risk of cavitating from the increased velocity.