On an '82 model 244 with CIS, I'm not getting fuel pumped up to the
fuel filter with the present filter, check valve, accumulator.  I
checked to make sure that the line was clear and it is.

Just for fun, I put the pump, accumulator, check valve, from a running
245 of the same year and now I'm getting fuel.

The original pump in the car works and fuel squirts out of the exit of
the accumulator, but when it is hooked up in the car, it is unable to
pump the fuel up to the filter.

My question is this:

Do these fuel pumps either "work or don't work" so to speak?  I believe
that is the case, but I'm not sure and don't wan't to go out and buy
another pump just to still have the same problem.  My gut feeling is
that the problem is the fuel check valve, but I'm not exactly sure how
to check the thing or the accumulator.

Any help would be appreciated.

Thanks!