Flow meters and EFI engines

[asra]

EJ22 EFI.......any tips re.........fuel flow meter (fuel mizer) and how to install on this engine. Book says before the pump, but with recycling fuel this can't be done?????? .......Russ[?]RDC

[pocky]

RDC,Not quite sure if this would work without seeing your setup,put the meter in pressure flow but put the return line instead of back to tank,tee it in between the pump and meter,but make sure your filter is located in the right place,down stream of any returned fuel,you might need an addional filter.Why are you running a fuel flow electrics anywayboundry rider

[asra]

Was runnin it with a sub4, as my seat tank is the rear one, and I sit up front (tandem gyro). It was reel good, could tell instantly what my fuel situation was, and if needed could then transfer fuel from 2 long range tanks, up to the main tank. I do a lot of LONG distance flying etc. Could do it the old way......guess my fuel levals at X mins flying time, but dont like that way anymore. Non believer in the "should be rite", or the "I hope". I want to know exactly.[^] Every time.So a way to set the "Miser" up for EFI, would be great.....RussRDC

[Tim]

Russ, you have to run a small anti-surge tank or reservior which is fed from the main tank (anything over a couple of hundred ml should do). The fuel comes out of the main tank, through the fuel flow transducer, into the anti-surge tank, out of the anti-surge tank to the EFI fuel pump, then to the fuel injector rail, via an EFI fuel filter. The return line from the injector rail then goes back into the anti-surge tank, so that the high pressure and high volume fuel is only circulating in a closed loop, and not through the main tank or the fuel flow transducer.I can post a diagram if you wish.RegardsTim McClure

[asra]

Tim.....thanks, yea got what you mean, actually have a surge tank on the machine, abowt 1 liter,I reckon all gyros should have one, especially when you throw them around with low fuel in your seat tank, and the tank outlet is on the side bottom of your tank.....outlet is let's say on the RHS, low fuel,you do a hard LH banking turn.....yes, all the tank fuel is now on the LHS of your seat tank, and you are running on carby bowl fuel only, coz your tank outlet is now in air, sukin nuthin but air.[]But getin back to the original stuff.......wouldn't the presurised returning fuel restrict the flow from the main tank down into the surge tank[?]....again thanks mate.......RussRuss....A1014 NT....gods country

[asra]

Yea tim, hows Queeensland mate, I know yu are there rite now, in your new house[] I won't tell anyone you are going to live there permament like, just between you and me mate.....trust me[]....RussRuss....A1014 NT....gods country

[Tim]

G'day again Russ. You are right about the anti-surge tank, they should be fitted to all machines that are chucked around a bit.Once the fuel leaves the pressure regulator it is back to normal pressure and no longer under high pressure. The EFI pump draws a little more fuel from the anti-surge tank than comes back through the return line so the returning fuel cannot increase the pressure in the anti-surge tank. The system makes up the difference by drawing fuel from the main tank. Hope thats some help.Tim McClure

[asra]

Thanks.....Russ....A1014 NT....gods country