06' RXT battery drain, fuel pump running with lanyard off

[Bret901]

I have a 2006 RXT 215, it sounds like the fuel pump comes on for 1sec in duration every 30secs with the lanyard off. Wil drain the battery in about 2 days if not disconnected. Any ideas what would cause this?

 

[Sportster-2001-951C-Stock]

Hmm, it would be highly unusual (and a real problem) if the fuel pump were to cycle under the circumstances you describe.

Instead, is it possible you're hearing the bilge pump cycling? Many so-called "smart" bilge pumps are over-designed (my opinion) Rube-Goldberg devices that needlessly cycle as you describe, and this is how they're designed to operate.

Additionally, if your cranking battery is nearing the end of it's useful life, this parasitic bilge pump cycling can result in a no-start over a relatively short period of time.

 

[Bret901]

It could be the bilge pump, I wasn't aware it had one, where is it located?

 

[BigDfromTN]

Bilge pump is not a factory item. IF it has one it should be mounted in the bottom rear inside the hull. There should also be an exit hole likely under the seat in the back some place.

Welcome to Seadoo forum!

Where do you ride? I live in Memphis Area (Bartlett) and keep my 2 RXT's at the TN river.

 

[Tytan]

I have a 2006 RXT 215, it sounds like the fuel pump comes on for 1sec in duration every 30secs with the lanyard off. Wil drain the battery in about 2 days if not disconnected. Any ideas what would cause this?

Does it start with the lanyard off ?

Sounds like the DESS post is bad and the computer thinks the key is still on so everything is still powered up.

 

[Sportster-2001-951C-Stock]

The fuel pump is mounted inside the fuel tank, might be able to use a long stick such as a broom handle and place it against the round flange mounted with 9 nuts on top of the tank and press the other end against your ear to listen.

If there's a bilge pump fitted, this would be aftermarket as far as I know.

 

[Bret901]

After some more looking around the gauge cluster powers on for a split second and it is in fact the fuel pump coming on, I timed it and it's every 15 seconds.

It will not start without the key.

I took a video of the sound
https://youtu.be/EWaSB0KYnyk
https://youtu.be/BfRefcAVbPQ

On another note I cleaned and sanded all the engine grounds read on another post that was his problem but it didn't seem to help mine.

 

[Bret901]

I pulled this ground relay seems excessively hot to the touch, it does stop with the relay pulled

 

[XP 787]

That's the battery relay. By pulling that you kill all power. Probably hot cuz pump keeps cycling.

 

[Sportster-2001-951C-Stock]

I timed it and it's every 15 seconds.

It will not start without the key.

This is the first report of phantom power-up that I've seen for the 4-tec.

Perhaps the 15 second cycle may help to isolate the cause but given the "on" period is so short (a split second) leads me to suspect one of the logic computers (MPEM?) is at fault.

Some signal may be causing the MPEM to power up though. For instance, with the lanyard off the post, pressing the START/STOP button normally would wake the MPEM for a period much longer than a split second, enough time at least to examine the quantity of fuel in the tank?

So try disconnecting the start/stop button circuit, perhaps the MPEM is receiving a false signal from there? Similarly, disconnect the lanyard post as well.

 

[Bret901]

I unplugged the 2 pin connector coming from the handlebars, that stopped the pump from cycling and seems to have temporarily fixed the problem. Gauges still work and start/stop still works. Only thing is the beeper didn't go off when I plugged in the key

 

[Bret901]

After you unplug the key it won't crank back or do anything though.

 

[Sportster-2001-951C-Stock]

Not sure I follow, exactly. However, if the lanyard post is no longer connected then the MPEM cannot read the security code from the key, thus you cannot start the engine until the code is read from the key.

It's encouraging that disconnecting this connector has allowed the MPEM to sleep.

 

[Bret901]

Do you know what the 2 pin connection goes to?

 

[Sportster-2001-951C-Stock]

No, but if that wire leads up to the handlebars there must be a switch up there? I was thinking it could be the start/stop switch until you mentioned the engine could be started. Obviously the engine cannot start if the start/stop switch is disconnected.

You also mentioned the buzzer stopped working. If the buzzer was disconnected then it would no longer buzz.... Doesn't seem likely a bad buzzer could cause the MPEM to remain awake and act strangely.

I don't have the electrical schematic diagram on hand... The factory shop service manual can be downloaded and it contains the electrical diagrams.

 

[seadoo2016]

hey guys just starting to having same issues here my fuel pump is cycling on and off for a quick sec...
I ill be posting my findings good luck!!!!

 

[BigDfromTN]

Looking at the wiring diagram... It appears the only two wire connectors are to the start/stop switch and possibly the VTS switch. The buzzer appears to have two single wire connectors and the VTS has a 2 wire and a single wire connector. This may not be so but its how it appears on the schematic.

You can download the shop manual at... Seadoo manuals dot net

 

[madmadeline]

Having same issue

I have a 2006 RXT 215, it sounds like the fuel pump comes on for 1sec in duration every 30secs with the lanyard off. Wil drain the battery in about 2 days if not disconnected. Any ideas what would cause this?

I am having the exact issue. I see 2 other people with this problem on this message thread. I have cleaned up the 3 ground connections, checked the DESS Post with a new one, swapped out the ECU as I have another ski. Still having the problem with the ECU powering up and the fuel pump cycling on.

Has anyone figured out the issue / solution?

 

[madmadeline]

It turned out to be the ECM. I have 2 skis and was able to swap parts out. The problem to report is that the fuel pump cycles on every 15 seconds. Most likely from trying to start it with a dead battery and using the start function on a battery charger.

 

[Hawk388]

I've seen this mentioned here many time and replacing the DESS switch or ECM seems to fix it.

 

[madmadeline]

Yea. I wish it was just the DESS post. That was my first try... Oh well, looks like I have a ECM in my future. It is just very expensive..