Symptoms of Mechanical Fuel Pump Failure

I can't tell you specifically but I would think it depends on just which part starts leaking as to whether it goes into the engine or out that little drain.

One way would be if the oil level INcreases. Another way would be by smelling it.

If it's not too much it will just evaporate. If it's a lot it will thin the oil which could be a problem if it thins it too much. I don't think you have to worry about that happening from what you have described.

The back side of the diaphragm needs to be vented to the atmosphere so the diaphragm can actually work. Theoretically there should be a seal in the fuel pump (I've rebuilt a few, the old Carters that were intended to be rebuilt rather than replaced as a unit when something fails) that should separate the back side of the diaphragm from the crankcase, but IME those really only keep oil from entering the fuel pump, and sometimes not even that - I typically put a little Permatex on that seal to keep from getting oil blown out the vent hole (BTDT, scared the hell out of me when smoke started pouring out from under the car)

then you're probably good.

Depends on the amount. If it was not enough to produce a fuelish smell or noticeably thinner viscosity, likely no damage was done.

nate

About two weeks ago I replaced the old worn out mechanical fuel pump and fuel filter on my 1983 Dodge van.The engine starts up and runs better now. cuhulin