I just sent a note and thread link to Delphi about this failure mode just to find out if they will actually respond. I don't expect anything back beyond "if your part fails, return it and try again.... you might get lucky next time".
But I noticed my pump was MF0155, not MF0154. I found it odd to have a unique PN (MF0154) for 1968 applications.
Anyone know the actual differences in the pumps for 1968 vs 1970? Is it only the apparent difference in vent line configuration (straight vs elbow)?
Their online specs do show a slight performance difference, which I also found interesting and unexpected. The 68 pump says max 8 psi, the 70 says max 7 psi. Really? Does this mean the 68 pump arm is stressed more for some reason?
I also found a note in their installation instructions to grease the inside of the arm cavity. I certainly did not do this. Anyone else put grease in that cavity and how important is this?
Mike