jvandyke Posted April 25, 2019 Share Posted April 25, 2019 The carter fuel pump is so obnoxiously loud. I think the ZZ4 has a spot for a mechanical pump, was thinking of installing both, switching the electric to use as a primer if needed but leaving it off otherwise. Research says this is doable. Might be a lot of needless work and risk just to shut up the stupid pump. I'm pretty sure a standard mechanical pump at 7psi should supply the juice just fine, could be wrong. Something like this https://www.summitracing.com/parts/crt-m4685/overview/year/1967/make/chevrolet If the mechanical failed and you resorted to electric and pumped your gas tank into your crankcase, that would be bad. Quote Link to comment Share on other sites More sharing options...
bunkhouse Posted April 25, 2019 Share Posted April 25, 2019 Many Z owners have used the 1st gen. Mazda RX7 (80-81) elec. fuel pumps. They are quiet, cheap and avail. at any chain parts store. Quote Link to comment Share on other sites More sharing options...
jvandyke Posted April 25, 2019 Author Share Posted April 25, 2019 I have an Airtex in hand, probably 30gph, I have no idea if that's enough to supply it under heavy load. I think this is what I have, the numbers sort of match. I can't even remember what I pulled it out of or why anymore. It seems to work fine. https://www.summitracing.com/parts/atx-e8012s/reviews/ Quote Link to comment Share on other sites More sharing options...
jhm Posted April 26, 2019 Share Posted April 26, 2019 I'm running both in my mild SBC. The stock mech pump is fine for street use, but I need the electric pump for any kind of track use. I'm using an Edelbrock pump, 38 gph, 4-7 psi. Quote Link to comment Share on other sites More sharing options...
jvandyke Posted April 26, 2019 Author Share Posted April 26, 2019 Well my kid (it's his car really) told me to leave the pump alone, he doesn't mind the buzz so I'm letting that one be. Quote Link to comment Share on other sites More sharing options...
jhm Posted April 26, 2019 Share Posted April 26, 2019 If the car doesn't already have one, an inertial cutoff switch is a good idea. I have both a manual switch and an automatic inertial cutoff switch in my fuel pump circuitry. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 26, 2019 Share Posted April 26, 2019 In my limited experience when mechanical pumps fail they spray oil all over the engine compartment. Electric pump doesn't put heat in the fuel like mech pump does, if that matters. Had issues with vapor lock on the L6 way back when. I fixed by eliminating the stock mech pump and fuel rail. Not sure if SBC has that problem very often. Quote Link to comment Share on other sites More sharing options...
jvandyke Posted April 26, 2019 Author Share Posted April 26, 2019 It seems many hot rodders run both and have the electric as a manual swtich to prime the system for faster starts (carbs, fill the bowls and flush out air from vapor locking) and add more fuel if needed for high load runs. Electric can push through the mechanical and mechanical can draw through the electric (if the "right" type electric). I like the concept but probably won't pursue it unless needed. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.