I rescued a 2005 FJR with <5,000 mile from an hoard of mice in a barn that were using it for low income housing. First order of business (after eviction of the previous tenants) was to clean the fuel tank. That done, I found that the fuel pump was not working, so I replaced it. I pulled the fuel tank a second time to replace the injectors and fuel ran freely from the line to the fuel rail. Is that normal? I thought I read that there was a check valve somewhere that kept that from happening. I would be interested to know if this is something that needs addressed before I proceed. Thanks in advance.