fuel flow transducer location

cytoxin · #1 12-12-2007, 04:48 PM

well after days of reading 50 million posts about this. ive come to the conclusion im installing the fuel flow transducer above the gascolator. however no one mentioned a doubler. looks to me the u shaped tube is gonna work harden and break if the transducer is not mounted very firmly..what did you do that made it rigid. have you inspected the amount of movement on shut down? here is where i am at.

n8zg · #2 12-12-2007, 05:06 PM

William -

Why the shelf? I don't see any problem with the location, but I'd mount it right on the firewall. A little doubler on the cabin side with nutplates to make it easy to mount and service and another on the forward side to act as a stand-off for clearance for the hose-ends.

cytoxin · #3 12-12-2007, 05:43 PM

the unit has to mount with the wires exiting out of the top. the shelf maybe somewhat obscured by the clamp but is a piece of angle bolted to a doubler plate inside similar to the sol/relay plate. the bracket at the bottom is an attempt to stiffen it up a bit. worked well but when i shake the hose in a simulated shut down the tube seems to flex and i feel will work harden it.
i know others have this set up just wondering what they did here.

CNEJR · #4 12-12-2007, 06:15 PM

Mounted mine between the fuel pump & gascolator on the inside. It was tight but seemed like a good place.

cytoxin · #5 12-12-2007, 06:36 PM

but i wanted it down stream of the filter/ gascolator..and it is suppossed to be level or close to it.do you have a filter installed....

jrvssgl · #6 12-12-2007, 06:46 PM

i am at this point too. i placed mine after the gasolator as did cytoxin. I used an angle iron, and rivited it to the gasolator doubler. It is nice and rigid. The only downfall is that the bend in the tubing is a little sharper than the picture of cytoxins. However I was able to put an adel clamp on the outside of the bend to give the aluminum tubing some extra support and to minimize vibration.

Please take a look CNEJR, or maybe you have at the size of the inlet going into the transducer. It is very small!! Maybe 3/16 inch. The fuel should most certainly be filtered before it enters the transducer Just a thought.

n38139 · #7 12-12-2007, 06:58 PM

I came straight out of the filter (mounted on firewall) for a total of 5 inches then I made a 90 after about 2 inches. I mounted it on a heavy piece of alum angle that is attached to the firewall also.

N941WR · #8 12-12-2007, 07:13 PM

William,

Mine is mounted as you did and with 84 hours on the clock, no problem, even with out the stiffener between the gascolator and the fuel flow meter.

There is a doubler on the inside of the firewall which the AA bolts through.

I would be more worried about the aluminum fitting the flex line attaches to than the "U".

tx_jayhawk · #9 12-12-2007, 07:38 PM

Hi Bill.

I take it you found out that your "u" was not the source of the fuel starvation issue you had a while back. Was it the idle screw on your carb?

I have the same gascolater setup (not flying yet) and wanted to verify it wasn;t the source of your problem.

Thanks,
Scott

BillC · #10 12-13-2007, 07:11 AM

Bill,

It may already be too late but check to make sure you can still get your battery lead to the master realy. I have my sender in about the same place and I wish I had left a little more room for the large power cable. Also I have noticed that when I have the boost pump on the flow indicates several more GPM than it does with the boost off. My guess is that the pump sends pulses of fuel down the line and perhaps if the flow sensor were further down stream it would not pick up the pulses. I also added insulation on the U tube just to help keep it cool like the line running from the sensor output to the mechanical pump.

Good Luck