Well maybe I'll just install both pumps with an A/B switch. That should be pretty safe. .

What you must realize is that the advertised flow rate is usually "free flow", meaning zero pressure (no load). If you look at a pump curve, you will see that flow rate decreases as pressure rises. In reality, you will never see 32gph out of that pump. I have not done pump sizing calculations for my Z (L24 with triple DCOE), but having extra flow is better than too little.

Edited October 26, 201113 yr by LeonV
Clarity

FYI, the Carter Pump P60504,specified for carbureted Mazda RX7's OEM replacement, is rated at 30GPH.

I removed the Holley Red this morning and installed the Facet. The facet was very easy to install and fit perfectly on the bracket I already had. I like the vertical configuration and that the fittings can line up nicely with the hoses. I also like the fact that I can remove the lower cap of the pump to change the internal screen. It is not quiet though. It's about 30% quieter than the Holley once it's primed up. I used the green fuel pump wire that is already in the 72 for +12v and since this pump is a chassis ground model, I ran the negative wire from the 72, to one of the pumps mounting lugs. I just hope this one is reliable...

I finished just in time for our first snowfall. Forecast is 6"-10" tomorrow, and that means S-A-L-T.

Edited October 28, 201113 yr by cygnusx1

That is a different facet pump than I used. Mine looked like this, although not sure if this is the exact one: http://www.google.com/products/catalog?q=facet+fuel+pump&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&tbm=shop&cid=11233075390286746526&sa=X&ei=kOyqTq7uFu_UiAKpybDtCg&ved=0CHUQ8wIwAg

Yeah, they make three styles of pump. I think the one that I got is their "gold" series which hopefully...means it will last. .

Dave,

Can you actually hear the pump running after the car is started? I can certainly hear mine while I'm in the on position on the ignition which I use for priming my Webers, but once the car is running I cannot hear it at all.

Also did you install a pressure regulator after the pump?

Hope it works out as well as mine has so far.

Mike.

One for the records:

http://www.princessauto.com/all-seasons/farm/transfer-pumps/12vdc/8144354-12v-in-line-fuel-pump

This guy might have rx7 pumps. http://grandrapids.craigslist.org/pts/2622772834.html

You can get RX7 pumps at Rockauto for $40. I chose the Facet because it was the right form factor for my current mount and hose routing. I had a regulator in line for the Holley adjusted to 3psi. When I installed the Facet, I didn't have to touch the regulator. Still sitting nicely at 3psi. I did some uphill, long pulls, at WOT and didn't notice any lack of fuel. As far as noise, once the car is running, even at idle, I barely hear the pump. My car is fairly loud though.

When I find some appropriate rubber bushings around, I'll put them in between the pump and the bracket. That should really quiet it down.

Edited October 28, 201113 yr by cygnusx1