Fuel regulator

Engine type? 914 or a fuel-injected model, presumably, but good to be sure we're on the same page.

The Rotax 914, 912iS, 915iS, and 916iS engines come equipped with a factory-installed fuel pressure regulator from Rotax. It is strongly recommended not to make any adjustments to the fuel pressure regulator on these engines, as they are precisely configured at the factory to match the unique specifications of each engine.

Importantly, it should be noted that using an aftermarket fuel pressure regulator is not recommended. Doing so will void your warranty, and there is no available test data on aftermarket components. The factory-installed regulators are robust units that have undergone rigorous testing and rarely fail. Therefore, it is advisable to rely on the factory-installed regulators for these engines to ensure warranty coverage and optimal performance.

For the 912UL or 912 ULS naturally aspirated carbureted engines, there is no need to install a fuel pressure regulator. Rotax's installation manual provides clear specifications for both the minimum and maximum fuel pressure for these engines. The mechanical fuel pump in these engines is designed to produce a maximum of 7.26 psi and a minimum of 2.2 psi.

Additionally, Rotax specifies that if you choose to install an electrical auxiliary fuel pump, the entire fuel system must be designed to ensure that the engine operates within the specified pressure range. It's worth noting that you can purchase an auxiliary fuel pump that meets these specified pressure requirements of 4.5 PSI. Therefore, the use of a fuel pressure regulator is unnecessary in this context, where the maximum allowable pressure is 4.5 psi for the auxiliary pump.

I apologize for not stating the engine.  It is a 912 ULS.  Looking for options to go from the mechanical fuel pump, back to the two carburetors and a return line to the fuel tank.  I’ve seen, what I assume, is an older model that is circular, compared to the newer version of the block on the compensation tube. Just looking for options for this E-AB.  Thanks everyone! 

Hi Nick,

As Rotax Owner said, it is not usual to have a pressure regulator on the 912 range. 

From what you describe, I think you may be referring to the fuel distributor/manifold. These are passive devises, of varying shape,  that facilitate the fuel flow from the mechanical pump to, the two carburettors, fuel return to tank line, (with flow restricting jet) & fuel pressure sensing line (terminates at a fitting for a pressure tensor). The device does not regulate pressure and has nothing to do with the carburettor pneumatic compensating/balance tube.

What are some options for this? Or does one strictly need to utilize what Rotax sells?