I finally got around to removing the fuel lines from the tank to the fuel pump. The little cone filter did have some sediment in it that I was able to clean out easily. Since I had easy access to the fuel pump I removed it. Upon connecting the two wires to a 12v power source (car battery) nothing happens. The pump makes no sound at all. I’m afraid it’s dead. Does anyone know where I can find a replacement? I looked on Mazdatrix for an OEM one and it says NLA. Has anyone had any of the non Mazda brand pumps?

 

When I was cruising Rock Auto the other day for stuff, I did notice they had Carter fuel pumps still (p70199). If I recall they’re the closest to the OEM? Some one can over rule me on that of course, but this is what I remember.

 

Rock Auto - https://www.rockauto.com/en/catalog/...fuel+pump,6256

i think any one of the pumps in the Daily Driver category will serve you well. i am familiar with Carter and Delphi as brands, and would trust them for this. this is the first time i'm hearing about US Motor Works, though, but that's neither here, nor there.

that said, here is a thread that may offer other insights: https://www.rx7club.com/1st-generati...tions-1125871/

 

There are numerous threads on here about which Walbro EFI pump and connection kit is shown to work, if the OP cares to search, or even scroll down a few inches and look at Related Threads.

 

Yup, I did scroll down and I did a search. The threads were a little old so I was looking for perhaps anything newer. Not sure why some people act like any asking of a question that may have been asked before is such a crime. The more a question is asked the more it’s likely to have a reply that will help someone in the future. I appreciate all the helpful replies.

 

The fuel pump may be ok, it just may be bound up with old caramelized gas. I have had good luck with cleaning out the older pumps. I use throttle plate cleaner or carb cleaner and spray it in the inlet and outlet sides and fill the pump as best as I can and leave it sit. I will gently tap the body of the pump with a small plastic dead blow hammer and spray the throttle plate or carb cleaner back into the pump. You will see the color of the cleaner that comes out of the pump change to a yellow or borwn color after leaving it soak and tapping the pump and spraying it again. Apply 12V to the pump's connector and see if it comes back to life.

If it starts to whir to life, you can continue the cleaning process or hook up a hose to each fuel inlet and outlet side, get a smaller containter of gas, put the feed line or inlet line into the gas and the outlet line into another small container. I have a small test harness I made for extending the reach of the wiring and connector to make this next part easier to do alone. Apply 12V to the connector and watch the pump feed the clean gas into the other container and flush itself out. I have had good luck with this method unless the pump motor is no good. Sometimes the gas just dries up in the pump in the same manner it does in the tank. When it does this, it seizes the impeller inside of the pump.

These original pumps are pretty stout and can come back strong. If you have any doubts about the pump, replace it with a new pump. I was just suggesting this as an alternative method in case your original fuel pump still had some life left in it.

 

"The fuel pump may be ok, it just may be bound up with old caramelized gas. I have had good luck with cleaning out the older pumps. I use throttle plate cleaner or carb cleaner and spray it in the inlet and outlet sides and fill the pump as best as I can and leave it sit."
FWIW, my 2¢: I used denatured alcohol to clean out the dried on gasoline varnish in a used tank I purchased years ago. It worked fantastically and IMO pretty fast. I don't know if DA will adversely affect any gasketing in the pump (if there is any)

 

I appreciate the help offered on here. You guys are great. I filled the fuel pump with some lacquer thinner and let it sit for a couple of days. Today I dumped out the rusty colored solution and filled it back up then hooked it to a 12v source. I heard the faintest little click then nothing. So, I persuaded the pump by tapping on it with a nylon hammer. That did the trick. I then pumped about a quart of lacquer thinner through it. Initially the stuff that pumped out of it was pretty nasty but then ran clear. I’m not sure if the flow rate and pressure are adequate. Is there any way to test those parameters?

 

Walbro and Bosch are current day OEM suppliers, which means they have to meet stringent quality and durability standards. The old school pump designs were good "back in the day", but the newer designs are better in every metric.

 

Glad to hear the original pumps is working! I have brought quite a few back to life by cleaning them and running them independent of the car. You could run the pump outlet directly to a fuel pressure gauge and run your inlet line into a container with gas. Power the pump and see how much pressure its producing. It should be adequate if the flow looks good independent of the fuel pressure gauge, but it never hurts to confirm.