Classic/Antique Car Repair: Gas still in oil after fuel pump change, electric fuel pumps, vacuum hoses

Question
Hi Brad, you answered a question about gas in the oil pan on my '67 Mustang.  Well I went and changed the pump and it seems gas is still getting into the oil pan.  I don't know if it's the carb or the fuel pump...  Do electric fuel pumps eliminate this problem and how hard are they to install?  If I have to keep on buying oil to change because I can't get this right, i'm going to be the cause of gasoline goign to $5.00 a gallon!  Thanks,

Dave

Answer
Dave, my experience is that if the carburetor is the cause of fuel getting by the rings and into the oil pan the color of the spark plug tips will tell that story. If they are black instead of a nice tan color then the mixture is too rich and could cause some fuel dilution. If the car is origional the 67 Mustang was pretty straight forward as far as emissions and vacuum hoses go. The only emissions device was the PCV system and the heated air intake system. You might want to make sure that the spring and flapper valve on the air cleaner is working right so that when the engine is warm that it is not pulling air from the exhaust manifold. If some one installed a later engine there could be some issues with miss routed vacuum hoses. I have found that when I have a seriously contaminated crankcase that it take several oil changes to flush it out. Also make sure that the engine is comming up to temperature and not running too cold and make sure that the automatic choke is opening when the engine warms up as this can cause a rich mixture as well. On the electric pump, if you remove the mechanical fuel pump and install a bolck plate then that eliminats a source of contamination. Most electric fuel pumps need to be installed near the fuel tank on a level with the fuel. Too few read the instuctions and make a nice looking bracket for the electric pump on the fire wall in the engine compartment and wonder why it does not work well. Most electric pumps are pushers and the closer to the tank so that gravity can get the fuel to the pump the better it works. I hope that the new pump is not a new old stock and has deteriorated sitting on the shelf. I would advise the pressure test on the pump that I wrote in the origonal answer.
Brad