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    Riva Fuel Pump Relay Question

    I have a 2006 Sea Doo GTX 215 and thinking about getting the Riva Fuel Pump and after looking at the installation instructions I don't understand why they show adding a relay in. Normally a relay is used when the existing wire can't handle the current draw and will have a wire connected directly to the hot side of the battery but the way they have it being installed it's just using the same MPEM power so don't understand why the relay is needed and seems to just be an additional point of failure.


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    DR2006RXP's Avatar
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    Quote Originally Posted by skip707 View Post
    I have a 2006 Sea Doo GTX 215 and thinking about getting the Riva Fuel Pump and after looking at the installation instructions I don't understand why they show adding a relay in. Normally a relay is used when the existing wire can't handle the current draw and will have a wire connected directly to the hot side of the battery but the way they have it being installed it's just using the same MPEM power so don't understand why the relay is needed and seems to just be an additional point of failure.
    Keep in mind the ground goes via the ecu pin so the load still goes via factory wires but the amp draw is monitored via the ecu ground and if memory serves me correct they only use the ecu ground to activate the relay.

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    Quote Originally Posted by skip707 View Post
    I have a 2006 Sea Doo GTX 215 and thinking about getting the Riva Fuel Pump and after looking at the installation instructions I don't understand why they show adding a relay in. Normally a relay is used when the existing wire can't handle the current draw and will have a wire connected directly to the hot side of the battery but the way they have it being installed it's just using the same MPEM power so don't understand why the relay is needed and seems to just be an additional point of failure.

    Stock fuel pump is operated by the ECU, it switches the fuel pump's ground (-), full load. The ECU also has to sense that the fuel pump fuse is drawing a current (+) as well. So if you fuse the fuel pump away from the fuse box and on to the battery it will not sense a load (+) and will prevent the ecu from cranking the engine. The relay gets switched by the ecu's ground with the relay's coil now being the only load on it instead of the higher current draw from the 340lph fuel pump. Wiring is fine for the added load of a 340lph fuel pump, the wiring is in free air and is actually rated higher in automotive application like a pwc.

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