I am having a fuel problem in my 94 wrangler 4.0. I recently replaced the fuel pump and filter, located in the tank. Since then, the jeep is very slow starting. This only happens if its been sitting for 15 minutes or so. I feel like the fuel is running back towards the tank when its off. I have been told that there is a check valve on or around the fuel pump that could be causing this. I cant find a replacement for this valve, is there another valve i could use or am i screwed??? and where exactly is this valve located?