In line fuel restrictors

[drjack]

Rebuilding my SBN46I carburetors, I found it necessary to replace the larger 6mm (1/4inch) Tempo fuel lines b/c one was cracked.
Then I found one of the smaller Tempo lines broken just past the output of the accelerator pump carb. A closer inspection found a brass fuel restrictor stuffed inside this particular line.
Can anyone indicate where else these restrictors are located? I'm hoping there isn't one belonging to the larger lines as they are somewhere in our local landfill site.

Plus what size fuel line should be used if I wish to replace all the smaller Tempo accelerator lines?
Btw...I have a 947, 2001 Seadoo Sportster.

 

[howie099]

The restrictor goes from the carb base to the accelerator pump inlet. I can't remember off hand what size the fuel line is.

 

[drjack]

Strange as I found this brass pellet inside the tube that connects the output of the accelerator pump and heading to the tee fitting that feeds both nozzles of the carbs.
And I'm quite certain that these carburetors have never been overhauled. Absolutely no markings on the screws, plates, etc.

I reading on previous board discussions that the grey Tempo lines are trouble. Two of those attached between the two carburetors easily split open. And, since the internal filters inside the carb was filty, I think I'm expanding my thoughts to reline as many fuel lines as I can get my hands on.

 

[Dr Honda]

The gray tempo fuel lines were not rated for alcohol. SO... with the new fuels in the USA... they decay, and fill the carbs with goo.

As far as the restrictor.... as the comment above, it's between the pump and the nozzle on the accl pump. Since you only have one pump... is before the "Y". It's known as the "Pump jet". If you need more or less fuel... you change that jet. But, internal... there's a bleed jet, that helps with overall pressure, and duration.

1/8" or 3mm hose will work with clamps, and that's generally what I would use in my shop.

 

[drjack]

The carbs are rebuilt.... I primed some of the primary fuel system by connecting the carburators supply and return lines and simulating a pulse action to the mag carb. Fuel is flowing out of the return line when compressing the pulse port.
But, now I'm not able to prime the accelerator pump on the PTO carb so fuel exits the brass pins inside the throttle body. So far all I hear is air when pulsing the accelerator pumps' button or pin. Is there a way to prime this particular pump with fuel? Do I need to "pop the internal needles" to allow fuel to enter the regulator side of the carb in order to provide fuel to the input of this accelerator pump?

 

[howie099]

I never primed the accelerator pumps. I just started the engine and it was was good to go. If the restrictor is clear the line should fill up unless something else is clogged. The best way I prime the system is pour some premix down the carb/carbs and start it. Pretty much all primed after the 2nd shot and the accel pump is working on the next start.

 

[drjack]

Howie, so I guess I shouldn't be worried about fine tuning the carbs, while in the water, until I do a couple of hot laps with the boat ?

 

[howie099]

If you set them to factory settings all you can do it try it out on the water. You can check it on the hose for leak in fuel system before you do out but the only way to really test them is on the water. If you were just cleaning out the carb/carbs and all the rubbers looked good, seat & needle looked good, and pop off is good you should be set. You can also idle the boat on the ramp also if you get in the water far enough which is better than running in the hose.

 

[drjack]

Just for kicks and giggles i decided to try starting the engine. It fired up within 5 seconds, but i shut it down since I wasn't set up for garden hose cooling, plus it's smokey in the garage with fogging oil burning away.
I guess I'm on hold until spring finally arrives. Still have shoreline ice in the harbour.
Come on spring!

 

[jhjesse]

Recharge jets.
http://www.seadooforum.com/showthread.php?60659-99-Challenger-accelerator-pump-question

 

[drjack]

Great thread to share. Much appreciated, Jesse.

 

[jhjesse]

Glad I could help out. Good luck.