Rotax 582 fuel flow sender

by in 2 Stroke Technical Questions 11 years ago

Looking to install a fuel flow sender on my 582 aircraft. Two options, one is a low pressure differential after the fuel filter on the suction side of the fuel pump, the other is to join the two separate fuel lines after the pump, install the sender and split them againafter the sender to the carbs.

Rotax have said that the latter option is ok, by email, but I am uncertain. Does the diaphragm fuel pump actually pump on the the same cycle to both outlets. I wouldn't want one outlet to 'suck' and the other to 'blow' and cancel each other out. Begs the question why rotax set up two outlets on the pump. I suppose if the diaphragm in the pump got a hole/stopped working both carbs would not get a supply, maybe the two outlets are for convenience and simplify fuel plumbing?

Anyone installed a fuel flow sender on a 582? If so where. No I don't use, not want to use an electric pump.
Thanks

Re: Rotax 582 fuel flow sender

by Jordan Paskevich » 9 years ago

Jordan Paskevich

1 17 0

WARNING! Do not use the MGL fuel flow transducer! The restrictor jet they want you to use is WAY to small and it can starve engine of fuel.

Yes the fuel pump on a dual carb engine has two ports (one for each carb) but one doesn't suck and other blow as this isn't how a diaphragm pump works. Both ports produce equal amounts of fuel to each carb at the same time.

You want to install the fuel flow sender on the suction side of the fuel pump between the fuel tank and fuel pump. Just make sure whatever type you use there is no internal restrictions within the transducer and use good hose fittings and clamps (You want NO air sucking into your fuel system)

Also you are to use an electric fuel pump if you fuel tank is considerably lower then your engine (most people use a facet pump)

Make sure you qualify your fuel system and check for any air leaks and make sure you have no resitricions.

Wes

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