Need Help With Carb. Hose Set Up

[weatly28]

I usually take pictures before I dismantle something so I can put it back right but I did not in this case and it has cost me lots of time. I basically just need to know how the fuel lines connect the dual carbs( 1996 spx ).

Front carb ( Carb A ) has:

1. Main fuel inlet
2. Another inlet on opposite side(same side as outlet)
3. Pulse
4. Outlet(return)

Rear carb ( Carb B )has:

1. Inlet
2. Outlet

There was also Y connector which I believe was connected to carb B outlet hose but thats all I remember.

I am trying to include a picture too but its probably not needed.

I have both manuals and still cant find a pic or instructions on how to connect these things together.The only thing I know is where the main fuel line and the pulse go.

Any help will be appreciated. Thanks.

 

[kustomkarl]

Ok here is a easy solution...First the carbs are up side down in the picture. FLIP them over .The linkage plate for the throttle cable goes to the front(this is the mag carb(toward the Magneto cover)) (other carb is the PTO( Power Take Off/ rear impeller shaft) carb)Here goes … On the two carbs the two outlets on the outer edge of carbs, on top... point to the rear of the boat...These are the fuel feed lines. Use the "Y"adapter to connect them to the same feed line from the fuel tank.
Next is 2 lines that point to each other on the top of the carbs toward the rear , connect these together. The pulse line is just that, To the crankcase, on the mag end down low to the crank case.

Karl

 

[weatly28]

I just want to make sure I am getting this 100% understood.


Each carb has an inlet and an outlet(with the exception of front carb)

Front carb with Fuel pump has inlet and an outlet and also the main inlet for fuel and the pulse inlet(4).

Based on what you said and how the fuel lines were connected:

Maint inlet on carb A (opposite side normal inlet)is going to fuel filter(supply)

Pulse to Crankcase

outlets on both carbs going back to fuel tank(return line)

That would leave the inlets on both carbs going to each other?

that makes sense as far as what was connected but does not make sense to me. How does that work. How does fuel go from inlet of carb A to inlet of carb B. Is there a possitive pressure of fuel from inlet on carb A due to the way the fuel pump is positioned and gaskets.

I would think it would make more sense to go from outlet on carb A to inlet on carb B. But then there would be the inlet on Carb A that would have to go to the Y adapter coupled to the other return line.

I dont know why they would not explain in the manuals( I have 2,one of them sealoc)or maybe I just cannot find it. The pic shows the carbs if you were leaning over the engine looking down. Throttle connector on front carb with fuel pump.

Thanks for the info but I just want to understand how this is working.

 

[kustomkarl]

I have pictures of my dual carbs with the lines attached. We need to speak the same language. The carb toward the front of the seadoo is the Mag Carb...it is closest to the (Magneto) unit. The carb in the rear of the seadoo is the PTO carb...it is closest to the (Power Take Off)., or impeller shaft. The fuel pump is on the PTO carb, it has 2 brass nipples on the top of the carb. the Mag carb has 4 connections. 1 connection is for the pulse, going to the crank case. On top of the carb are 2 brass nipples. When you install the 2 carbs and install the sync linkage and the allen screws you will see that 2 nipples point at each other, from carb to carb. These are connected by one line. The other 2 nipples point to the PTO and connect the feed from the fuel tank. A "Y" connector connects a hose to each carb. The last line is the return, and the only line left. It goes to the Mag carb.,down low by the throttle cable bracket. I will search for the pictures I have so you can understand it better.

Karl

Karl

 

[weatly28]

Thanks,I will definitely need some pics to better understand, I will be searching the web as well.


Thanks again.

 

[weatly28]

I found a diagram from a cd parts list I had.

My spx was already set up with mag carb as fuel pump,ran fine before. I assume this was done because the pulse is right there to match up. Otherwise it would have to loop around.

It shows:

mag carb with 4 intlets total:

Main fuel in
Pulse
In
Out

PTO carb with 2 inlets total:

In
Out

It shows both carb return lines coupled with Y connector going back to fuel tank. Fuel from tank going to MAG carb fuel inlet(not arrowed fuel inlet).

It also shows "in's" on both carbs going to each other. Does this sound right? I Have looked at a couple other diagrams of dual carbs and they show the "out" on the mag carb going to the "in"on the pto carb.

I just done see how the "in" on the mag carb can feed the "in" on the pto carb unless the "in" on the mag carb is actually pumping out.

I wish I could get my hands on some spx dual carb pix,I am still searching the internet. I will try a couple people on the forum with 1996 spx or similar model to double check.

Here is a pic I took after connecting it

 

[kustomkarl]

I will get pictures of my Challenger, that has the same carb set up and post them here tomorrow. I have my challenger at work, in the garage, and it is the weekend. Everything I posted is from memory as the manuals doesn't have real clear pictures either...I'll have it done tomorrow..pictures and a diagram of all the connections. Sorry for the confusion.

Karl

 

[weatly28]

I started it up today and seems to run ok with the the "in"s on the carbs going to each other. will take out for water test and tune hopefully this afternoon.

 

[weatly28]

ran it a little more and found that it is running so rich I have to start it with throttle fully open,then it barely starts. I tried clossing the low speed needles all the way but no change,lots of fuel,too much to spark. I can see fuel in both carb throats but mag carb will drip fuel from miser after turning the motor over but doesnt seem to do it during. I just rebuilt and cleaned the carbs.