What kinda wiring and relay for fuel pump?

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mccula

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Hi all. I'm in the process of re-doing some of the previous owner's (shoddy) electrical work.
He has the holley fuel pump being powered by a wire leading straight to a fuse in the fuse box. When the turn signal is on, you can HEAR the pump pulsing with the turn signal. OBVIOUSLY not right.
I know the best thing to do is to run from the battery with a relay and fuse to the pump.
What kinda relay and fuse should I run? And, also, what do people mean when they say strait off the battery? Should I tap into a wire coming right off the battery pos., then into a relay, than fuse, than to the pump?
I'd also like to add a switch to this setup for anti-theft and to prevent battery drain.
Thanks in advance.
 
You need to post what Holley says about this specific pump, IE wire size recommendation and amperage draw.

Also, "it's complicated." If you have the old style ammeter, and you tap something right off the battery, the ammeter will not show accurately, but on the other hand, if you tap off the correct side of the ammeter, this puts EVEN MORE load on the already inadequate ammeter and bulkhead wiring.

One place to tap off is right at the big nut on the starter relay, this is "same as battery", and once again, this will make your ammeter readings "funny."

From that tap, run a fuse (depends on the Holley pump draw) to a relay--which also depends on pump draw, and use the ign run (blue wire) which feeds coil, regulator, etc, to "fire" the relay. If you want an additional toggle, wire that in series with the coil to the "blue" wire. I would guess you want at least no10 wire back to the pump, but ONCE AGAIN this depends on how large the pump is and the amperage draw.
 
SlantSix Tesla to the rescue! :cheers: Ok Dan I got a good one for you... How much electricity does the H.A.A.R.P. draw when it's in use? Just kidding! (though he probably knows anyways...)
 
Ok, I think I got it figured out. Holley has a few pages of info on this topic.
Here is their relay kit:
http://www.holley.com/12-753.asp
and here's the PDF instructions for it:
http://www.holley.com/data/Products/Technical/199R7914-3rev2.pdf
All their fuel pumps are listed here: http://www.holley.com/types/Electric Pumps - Carbureted.asp
I think I have the blue one. Either way, the pump that draws the most current looks like it only draws 4 amps. (The 'black' pump. I know mine is either red, blue, or black, and those pumps draw 2, 3, and 4 amps.)
So according to holley, you should use either their kit or an equivalent 4 wire relay. Well I picked up a 4 wire, 30 amp relay from advance auto:
http://www.autozone.com/autozone/ac...2-Volts-universal-relay?itemIdentifier=203873
and I also got some 10g wire, a fuse holder and fuse.
Will this relay work? I don't see why not... holley's is a 30 amp, 4 pin relay and so is this. Now if I understand correctly, I have to wire everything like this:
Wire from starter 'nut' to inline fuse. From inline fuse to relay. Then ignition wire to relay. Interupt the wire from the ignition to relay with a switch. Wire from switch to the pump. (And obviously ground everything that needs to be grounded).
Is this right?
 
Wiring made easy. "CarTech" or workbench series have books for many different applications. SA 160 is a book on Automotive Wiring and only cost $24.95. I use this book in my High School Auto classes. Also, one company called Waytekwire.com has all the "wiring gismo's" any one would need, check them out! You will be happy you did!
 

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