Triple Weber fuel pump switch-a roo

[Zedyone_kenobi]

When Installing my triple webers, I ordered a lot of parts. I mean a lot. Not all of them were as researched as others. At times this means I had a few 'extra' parts laying around that I may find a use for some day. Maybe not.

Anyway, one of the parts I received was of course an electric fuel pump. This is the beast I ordered as it was used by others and seemed to fit the bill for pressure:

Well as much fuel as this pump put out, it put out exponentially more SOUND.. think fire alarm loud, think chainsaw, think electric engraver loud!

I installed the rubber isolators like it suggested and even put a thin piece of rubber gasket material in between the bracket and the mounting point on the car. No luck. I added an extra deck carpet in my car. NO luck, it was crazy loud.

I put up with it, as I had to have pump and I needed this to work while I dialed in my triples, but it all came to a head when I attempted to make a video the car running. When I downloaded the video from the camera, all you could hear in the movie was the darned fuel pump! It was just terrible sounding.

So, with that being said, I decided to ditch the pump and take the advice of many members on this board and go with a 1981 RX-7 electric fuel pump. To say this is quiet is probably the biggest understatement on earth. It is just dead silent. I left my Holley fuel pressure regulator in place and wide open it allowed the pump to put out 2.7 psia to the fuel rail with the engine running. I may need to remove the regulator as, it is not really needed with this pump with everything I have read. I was running the chainsaw pump at 3 psia. I have not done any long 4th gear pulls to see if 2.7 is enough, but I think it will be fine.

Anyway, this is the pump I ordered from Rock Auto..

It was only 42 bucks and arrived in 2 days. I recommend it completely.

[240260280z]

You may wish to stick this fuel damper/regulator inline to your carbs:

http://www.piercemanifolds.com/product_p/b26570.htm

[Zedyone_kenobi]

Not sure, as this would seem to be better suited to a diaphragm type of pump where the pumping pressure oscillates between high and low pressures. The RX7 pump is more of a rotary pump with constant pressure like the CARTER was. I could really see that being useful with the OEM mechanical pump.

[madkaw]

Welcome to the rx7 pump club. Have the same pump in my car- very quiet. So quiet I left the ignition on all night with the pump running- still going strong

[conedodger]

I ordered one from Amazon a few minutes ago. Silverstreak1971 had told me to get one as I complained about the jackhammer that was the fuel pump I got from Summit Racing. Sad thing is the Summit Racing model I got was about half again as expensive.

[tamo3]

Thanks for the write up. I was about to install chainsaw pump, but I order same thing at amazon too.

[Lazeum]

Do you know how much GPH the pump is rated for? It could be a interesting alternative to after market pumps.

I'm currently running a Mallory pump because of its supposely quiestness & flow rating. It is much quieter than my previous Carter pump I had before but I can still clearly hear it, only at idle though.

[edit]: I found the answer on rockauto spec sheets: 30 GPH.

Edited September 15, 2012 by Lazeum

[steve91tt]

I have run the 1979-1981 RX7 pump in both my track and street car. I'm using a little different style pump than the one shown above.

Great little pumps, quiet and so far very reliable. However, I ended up recently changing to the Carter in my track car as I found that I could out run the pump at WOT in 4th near red line at the end of a long straight. It wasn't a problem until I switched from 34mm to 37mm chokes in my Mikuni's. I don't see this being an issue for a street car and I will continue to run the RX7 pump on the street. I thought I would share my experience for those who run on the track. If you see your AFR's drop off at high RPM's then you might look at installing a fuel pressure gauge in the cockpit. Just sayin'

[Zedyone_kenobi]

Good advice. I am going to go up to 32 mm form 30, but not really sure that will make a bit of difference. I will keep an eye out on my AFR if I am ever in a situation to be at red line in 4th gear!

[steve91tt]

I can say that in my case going from 34mm to 37mm was nothing but positive. More power up top and no noticeable difference on the bottom end. I wish I had gone with 39 or 40's.

[conedodger]

Ok, thanks to Amazon for the quick delivery, my new RX7 fuel pump arrived yesterday. I installed it a few minutes ago and all I can say is HIGHLY RECOMMEND! I now have no fuel pump sound at all. I have a permanently installed fuel pressure gauge and a fuel pressure regulator in my engine compartment and what was 2psi is now 2.5psi. Silent and efficient!:classic:

[tlorber]

Dodger, did you put in any kind of cutoff switch? Either manual or automatic?