First of all, thanks for this excellent forum. This is my first try to solve a technical problem related to my Seadoo (that used to work like a charm for years now) and I found highly relevant information here.
I am currently experiencing what looks like a fuel delivery problem on my 1996 GTS. From a cold start, the engine behaves just as usual and runs great for about 10 minutes. Then, the RPM gets lower and lower at full stroke until it dies. From then on, I need to rest for a few minutes and then, restart the engine that would run like new but only for half a minute or so. Then, the RPM gets lower again and so on... I started to investigate the problem and one of the thing I found out so far is that my check valve for the air pressure regulation on the side of the hull is defective (no air flows across in any direction) but the other one is still working good (air flows towards the fuel tank only) and I guess this may be my problem.
Then I found this very interesting thread started by JPX titled "Troubleshoot Fuel Delivery Problems : low revs, bogging, surging". Since
In this thread, it is mentioned as follows:
7. Check all fuel hose connections are tight and that the check valves freely blow one way, but do not the other (one above the fuel tank and one on the side of the hull from the fuel tank):
So, this may confirm my hypothesis. But thinking about it, I now have a few question.
- Why two such check valves in parallel? Why not only one?
- Why using these two locations (above the fuel tank and on the side of the hull)?
- Could only one defective keep the system from working properly?
My current guess is that, since these valves are check valves with the flowing direction towards the fuel tank, they are intended to keep the tank from collapsing in the event of a severe temperature drop while allowing the positive pressure to build up in the other direction to feed the carburetors from the tank. This would mean that a blocked valved would not keep the system to function properly in a stable temperature environment and this would mean that I probably didn't find my real problem and that I will have to go on with all the process proposed by JPX in his thread (changing the grey hoses and so on...).
But before proceeding as such, if anyone could share his/her thoughts about it to help me understand what's going on, this would be appreciated. Thanks in advance!
I am currently experiencing what looks like a fuel delivery problem on my 1996 GTS. From a cold start, the engine behaves just as usual and runs great for about 10 minutes. Then, the RPM gets lower and lower at full stroke until it dies. From then on, I need to rest for a few minutes and then, restart the engine that would run like new but only for half a minute or so. Then, the RPM gets lower again and so on... I started to investigate the problem and one of the thing I found out so far is that my check valve for the air pressure regulation on the side of the hull is defective (no air flows across in any direction) but the other one is still working good (air flows towards the fuel tank only) and I guess this may be my problem.
Then I found this very interesting thread started by JPX titled "Troubleshoot Fuel Delivery Problems : low revs, bogging, surging". Since
In this thread, it is mentioned as follows:
7. Check all fuel hose connections are tight and that the check valves freely blow one way, but do not the other (one above the fuel tank and one on the side of the hull from the fuel tank):
So, this may confirm my hypothesis. But thinking about it, I now have a few question.
- Why two such check valves in parallel? Why not only one?
- Why using these two locations (above the fuel tank and on the side of the hull)?
- Could only one defective keep the system from working properly?
My current guess is that, since these valves are check valves with the flowing direction towards the fuel tank, they are intended to keep the tank from collapsing in the event of a severe temperature drop while allowing the positive pressure to build up in the other direction to feed the carburetors from the tank. This would mean that a blocked valved would not keep the system to function properly in a stable temperature environment and this would mean that I probably didn't find my real problem and that I will have to go on with all the process proposed by JPX in his thread (changing the grey hoses and so on...).
But before proceeding as such, if anyone could share his/her thoughts about it to help me understand what's going on, this would be appreciated. Thanks in advance!