I'm in the middle of pulling apart my truck to bump the timing and put the KDP tab in. I removed the spring, fill piece and 2 piece delivery valve assembly with no problem. The repair manual states to take out the copper d. v. washer. Mine doesn't have one. I checked the next d. v. and it was the same. Is this going to be a problem? Do all pumps use this washer or just sum? Thanks for any help guys.