warp2diesel wrote:
....is crimped onto the lower part and could be the cause of the air leak. All the crimp needs to do is come a little bit loose and it can suck air. Since nitrogen, oxygen, CO2 molecules the major components of air are much smaller than fuel, they can leak in through a very small gap that fuel can not leak out of even at 1000 PSI.
Installing a lift pump will place the filter under positive pressure and eliminate this problem in the future.
Steve
My BMW 324TD had a fuel filter head with primer pump similar to the CRD's. It was plagued with air leaks. BMW's revised filter head had no primer pump. I added a NAPA inline pump and solved the problem. Another solution was to use a diesel Rabbit filter head from a boneyard.
Wobbly