I'm not sure if many people had this problem or not, so I'm going to just give a little story here about an experience with a Mercruiser fuel pump. I have a 1993 Mercruiser 5.0LX 305 V-8 230HP. I was having a problem with fuel making its way into the oil. So, I learned that either the fuel pump needed to be replaced, or, the carburetor need to be rebuilt. Both of these parts were original from 1993. So, I replaced the fuel pump thinking that the ethanol in the fuel must have eaten away at the internal parts of the fuel pump. After replacing the pump with a mercruiser pump, the engine wasn't really running right and the carburetor was beginning to flood out. The carburetor is a Rochester quadrajet. So now that this was happening, I decided to rebuild the carb since it was all original. After rebuilding, the flooding problem in the carb was still occuring. I tried replacing the needle and seat and float again in the carb with it still flooding out. Then I purchased a rebuilt Quadrajet from a carb shop and was told that if this carb floods out then there is a problem with the fuel pump, and the quadrajet can only take 4-6 lbs of pressure and anything more than that would force the needle open. So, I replaced the carb and still had it flooding. Now I called Mercruiser to que them in on the situation. After I explained to them what had been going on, they said to try a thicker gasket, part # 27-431861. After this gasket was installed, the flooding did stop. However, a few minutes after running the engine, a ticking noise presented itself. This had to be the rod that pumps the fuel pump slapping against the pump or the cam inside the engine since the pump was now about 3/16 of an inch further out from the block. Now another phone call to Mercruiser to find out that "if after using gasket 27-431861, the flooding does not stop, or a ticking noise occurs, then you must use an aftermarket fuel pump." So, now I bought a Sierra fuel pump, part # 18-7283, bolted it on, and had no problems since. Just thought I would try to spread the word if anyone else was having this problem. Any questions, please dont hesitate to ask!