07-27-2009, 01:40 AM #1
- Join Date
- Jul 2009
99 SLTH 700 Fuel System - Pressure and Venting
My fuel cap had a hole in it. Before I discovered the hole I tried to pressurize the fuel system by blowing into the return line. Unable to pressurize the fuel system I discovered the bad fuel cap.
I now have a good fuel cap and I can pressurize the fuel system by blowing into the return line. The relief valve pops around 1 to 2 psi. However, I never hear any air relief when I open the fuel cap, even after riding the ski. When I blow into the return line, then open the fuel cap, I hear the rush of air.
The check valve is working properly.
I have dual Keihin CDKII carbs, no accelerator pump.
QUESTION - How and when does the fuel tank get pressurized?
QUESTION - Should I hear a rush of air when I open my fuel cap?
QUESTION - How do I verify the fuel lines are connected properly to the fuel tank?
I believe the bad fuel cap was causing my bog/die when trying to accelerate above idle. However, I had to try a different set of carbs to completely fix the bog/die. Now I am not convinced the fuel system is pressurizing properly.
07-28-2009, 07:34 PM #2
- Join Date
- Jul 2009
Well, I think I have found the problem. Actually, I had a combination of problems. My fuel cap had a hole in it, and now I have discovered my fuel pump is leaking air.
Question - My fuel pump should not leak air between the two parts secured with the torx screws, right?
Right now, I can not hold pressure on my fuel pump and I feel air leaking out between the pump cover and check valve block. a couple of weeks ago I installed a carb kit (non OEM). It included parts for the pump. However, I kept my old parts just in case. I can not get the fuel pump to hold pressure with the original parts or the rebuild kit parts.
Thanks to John Zigler, I did get a set of carbs that work. Now I just need to find a Keihin fuel pump for my original carb set.
Thanks again John Zigler for sending me working carbs !
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