2007 Speedster Fuel Return Line Not Connected

[abuzar1]

I just bought a 2007 Seadoo Speedster. It wouldn't rev above 6000 rpm when I bought it. Maxed out at about 37 mph. I changed out the spark plugs (they didn't look terrible) and I decided to change out the fuel filters in case it was a fuel restriction. The internal strainers were pretty clogged up and I replaced them.

I noticed something interesting, only the supply line to the fuel pump was connected to the fuel rail. The return hose is just blocked off with a bolt plugging it. Is this normal? How does this effect the engine? Also there was no external cylindrical fuel filter. Supply line connects directly to the fuel filter. I bought the wix cylindrical fuel filter to replace it with, should I just splice it inline with the supply line?

Attached picture below, the fuel line on the left is supply and the fuel line on the top right is return line (plugged off). You can't see the end of it but it's a short hose plugged off in the end with a bolt.

 

[Mister Magoo]

First off, you can't trust the stock speedo. Use a phone app or a Garmen. Usally, slow speeds come from the wear ring area and is easy to fix. I have a 2007 Speedster 155NA and my top speed is 47, on my Garmen. What engine do you have? Sounds like the 155NA. That is not a return line, its a vent. This pump was used in a number of applications. This boat has a thru hull gas tank vent so the vent on the pump is not used. The fuel filter is on the bottom of the pump (internal strainers), in the tank. Do you have a manual?

 

[MacSeaDoo]

These boats do not utilize a return loop for the fuel, what you have there is how they are setup.

You need to be careful with adding an inline fuel filter because you can end up restricting the flow.

 

[abuzar1]

Thank you for your responses. Does this model not utilize an external inline filter then? I have changed both internal fuel filters. I have the Naturally Aspirated engine.

I used GPS to record the speed. The issue was that the RPMs would not rise above 6000, which I know is not right as the max rpms in the owners manual are 7400 I believe.

I don't have a service manual. The boat has a new wear ring and impeller.

 

[Mister Magoo]

With my Solas impeller I think I see 7200 RPM's. I still would look in the pump area for the low RPM's. I don't think your in the limp-home-mode. When my Speedster got went into that mode my RPM's would not rise above 2000 or so, max speed was 10 MPH.

 

[abuzar1]

I was just thinking the fuel straining being clogged would limit fuel and cause RPM issues. I took a look at the pump it looks decent to me but I'll post pics.

 

[abuzar1]

Well guys, I don't think it's the impeller. I replaced the fuel filters and new plugs and took it out again. Hit about 40mph with 5 people in the boat (I know, I know). It would blip to 7600 rpm and then start coming down and settle at 7200 rpm.

After about 10 mins it started bouncing off the limiter at around 6000, then 5500, then 5000. I would have to drive it at half throttle for it to work right and barely got it back. It wont rev past 6000 out of the water either.

I do have 2 codes. P0600 (was present from the start ) and P0562 (12v low). Not sure why 12v was low unless stator isn't working right. I will get the battery tested.

 

[abuzar1]

No schrader valve on it though, how do I check fuel pressure? Should I disconnect the hose from the rail and hook it up to pressure tester?

 

[abuzar1]

I know I’ve posted a bunch of times. Here is an update. Cylinder pressures looked good all three showed 170Psi on my HF compression tester. I’ve attached pics of the spark plugs and impeller. Also attached pics of the engine bay in general, it looks to have several electrical
Plugs that don’t go to anything? They looked good to me as well as a video of what the fuel injector spray looked like.

 

[Mister Magoo]

That plug in your hand in the port for the BUDS (or Candoo) scanner, the cap comes off. Its hard to troubleshoot the wear ring/impeller area without take the pump off, its comes off easy. Besides you need to service the bearings in the pump. Its difficult to tell from the video but the far right injector does not seem to spray very much, the 2 on the left soak the valve cover but not the one on the right. I went back and re-looked at your pump pictures and there looks to be a stick in the impeller area.

 

[abuzar1]

I’ll take off the pump and measure clearances. In the video I think I had the fuel rail angled in such a way that the third injector was angled up. I think the spray looked similar.