A couple of things,
1st...The term "accumulator" is not used in my Service Manual. Are you refering to the "fuel reservoir" located at the fuel pump and filter?
2nd...I have noticed that upon turning on the key, I hear the fuel pump start, then about 3 seconds later I hear the fuel return line splashing fuel back into the fuel tank. I can also detect that there is air mixed with the gas in the return line.
Last, could it be that the check valve at the fuel pump is not working properly? Is this my problem?