Re: VRO (3 wire vs 4 wire)
Today I emailed
www.usavemarine.com, one of many online sellers, with the same question.
They responded and said the correct pump is 5007423 which replaces all other numbers. Now I'm really confused, since other sellers state one is for existing 3 wire pumps and the other is for existing 4 wire pumps, and still others say 5007423 will upgrade you to the 4 wire from 3 wire.
Thanks for your reply- I really look forward to your description when you get it. I can't believe this has to be so confusing.
The pump I received yesterday is actually from USaveMarine, fwiw. Excellent service and price by the way.
I think I understand why he said what he said... read on.
There are now three pumps and actually this is well explained on their website, I believe:
5007420 replaces 4 wire pumps, 1991 and newer
5007423 replaces 3 wire pumps and
includes adapter to change to 4 wires (see below).
5007421 for non-oil mix applications. Does not mix oil.
5007423 is the pump I just received. My old pump, the one I'm replacing, has three wires: tan (looks kind of orange), black and gray. These three wires end in a three pin male "amphenol" connector. This in turn connects to a female amphenol connector and the same color wires come out of the female side and are already connected to various places in the engine.
The new pump has 4 wires coming out of it: tan (also kind of looks orange), black, gray and the new wire: purple. The 4 wires end in a 4 pin male amphenol connector.
My new kit includes what I would call this a "pig tail" adapter type of thing. It is a female 4 pin amphenol connector with a SINGLE purple wire coming out if it and 3 empty holes.
The installer (me, you) then moves the three wires from the old 3 pin female amphenol connector to the 3 empty holes in the new 4 pin female connector, matching up with the corresponding colors on the male (pump) side. Those three wires are already connected to appropriate places on the engine, so the only new connection is the purple wire and the instructions then tell you where to connect that purple wire.
This is where I believe the two kits differ. The 020, intended for replacement of 4 wire pumps, does not need that pigtail/adapter and I will assume it does not have one. (don't know for a fact though). The pump must be the same as the "023" with 4 wires terminating in the 4 pin male amphenol connector. The engine, already set up for 4 wire system, already has the female 4 wire connector with all 4 wires already hooked up where they belong. It's just plug and play.
[edit]. Another thing I just discovered. The actual pump in my "23" kit is labeled 5004554. In reading some other posts on this subject (VRO/OMS P/Ns), I've found out that the "020" kits as well as some equivalent, superceded kits also have pumps in them labeled 5004554. Obviously, the kits have the identical pump, differing only in the small pieces included.
That is why I
think you could use the 023 to replace any 3 or 4 wire pump. You just wouldn't use the pigtail adapter.