My gas cap was having issues of the lock not turning allowing for me to open it so, I removed it and added a little lubrication to a few parts to get it working. As I go to reinstall it, the rubber washer (PN : 92093) that is on the right and back of the flange assembly falls into the tank. How critical is it for me to go retrive it? I'm trying to figure out where the fuel pick up is but, can't tell from the fuel pump assembly pictures. I can get the washer for about $5 and install it.