Two Fuel Flow Sensors

[mmarien]

I have a fuel injection system on my o320 with a return fuel and installed two "Red Cube” FT-60 flow transducers according to table 34 in the install manual. One cube is upstream from the injectors and one is downstream just before the regulator and the return to the tank. I have D37p14 named FUEL and D37p19 named FUEL 2. The downstream cube (D37p14) is my old one and the upstream cube (D37p19) is a new one. I'm not getting a fuel flow. I get a high negative fuel flow for a moment when I turn the pumps off and the fuel flows backwards to relieve the pressure but no positive fuel flow. 

Any suggestions.

 

[mmarien]

I haven't solved this yet. There is activity in the debug data. Some pictures:

 

[dynonsupport]

Your main flow, on pin 14 is LOWER than the flow on your return line. I don't think our code expects this and probably limits this to zero. Are you sure you have them wired to the right places?

 

[mmarien]

I'll check the wiring tomorrow but now that you mention it, I'm pretty sure that the new cube is the upstream cube and is on pin 19. If it is I'll switch the wires.

 

[mmarien]

Yep. That's what the problem was. Works like a charm now. Thanks