Which relay to buy for Fuel Pump Rewire?!?!?!
 

as the title states

theres like 5 different Bosch 30-40amp relays

i'm so confused, i'm not sure if they're all the same thing, just advertised differently or if some aren't waterproof or something

could someone post a link to the correct one, it would be nice if it was a link to a place that i could just click the "buy" button lol

thanks guys!

Any 4 terminal 30 amp relay from the local auto parts store should work, that's what I'm using. Like the one they sell in the isle with fog lights.

You don't really need one though, unless you're planning on having a manual switch to turn on the fuel pump.

You can just run it straight through the fusebox in the engine bay, easier and cleaner imo

You may need or want a relay to get more voltage to your pump and more output from it, it works better, I've done both.

ok cool thanks guys

Like Tom stated if you plan on running some higher horsepower this one's a no brainer. http://rx7.com/store/rx7/fuelpumprelay.html The standard ones tend to heat up and wear out over time. This one might seem like overkill but for the price its peace of mind. Wont leave you stranded. G

Damn... G

That looks like a starter soleniod for a Ford from 1990....

Tom is right, any relay works, the best out there are Bosch but trying to get one is almost impossible. I went to many stereo shops and auto parts and no one carries them anymore so I bought what they sell. I also bought a spare and will keep it in the car just in case..

L8R

I'll have to put a spare in my car too. But if the relay fails then you just have to connect two of the wires together off the relay to get the power to the pump to get home.

Single pull double throw relay. I still have like ten brand new ones with new harness if you want PM me I sell and ship cheap.

Don't forget:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/word-about-re-wiring-your-fuel-pump-%5Bpics%5D-921896/

and

https://www.rx7club.com/classifieds-violations-265/theories-why-im-always-poor-1993-ssm-build-951172/page8/
(scroll down to post 189 and after)

Hope that helps...

Always use relays for switching high current components. A fuel pump definately requires a relay; I would never use an ECM to directly operate a fuel pump. You can use four pole or five pole relays. I typically use the 50 amp rated relays; they are good for just about anything except for main power switching and for four or five bucks - cheap.

Waytek has an appropriage selection:
http://order.waytekwire.com/products...d%20Solenoids/

They also have the sockets for the relays:
http://order.waytekwire.com/CGI-BIN/...472002+M50+ENG

Your local NAPA also has all of this stuff......

the wrong relay can destroy any and all solid state modules in the elec system.

the relay must have either a diode or resistor in it to suppress voltage spikes that can be 100-200 volts when the magnetic field collapses.

note the sticker on the relay in the above rx7.com link...

i currently have two Power FCs being rebuilt due an improper relay,

howard

The rx7.com site also says about their relay "This is a competition part that is only needed on dual pump or external pump applications."

I have been using this for four years and never had a pump problem. Pump rewired with 10 gauge wiring. I had two small relays fail on me in three years previous and the car only sees three to four thousand miles a year. G

this is the one im using, 40 amp sealed housing. you have to make the wiring.
http://www.bmotorsports.com/shop/pro...roducts_id/503


best thing is you could do any gauge wire and not be stock with premade pig tails that either the wire gauge is to small or you have to solder wires to extend the pigtails to your pump,fans or coils.

you could also find here the injector connector kit
ignition coil connector/same as toyota

I just ordered a 70 amp relay from McMaster-Carr that "can handle a high-inrush current of up to 120 amps", part number 9672K36 $13.64 .

http://www.mcmaster.com/?orderview=n...17/895/=eq3aws

I'm also going to order some Insulated electrical bulkhead connectors to get my fuel pump rewire down to the pump.