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Thread: How do I turn on my fuel pump
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07-20-2017, 05:35 PM #11Xtreme Member
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Make a hot wire harness or buy one. Run the signal wire that would normally be to the pcm to a switch on the dash other end of switch to 12v source. Just make sure you have nice clean, dedicated voltage to the pump.
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07-20-2017, 06:40 PM #12Xtreme Member
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Supporting Memberyou NEED a fused relay to the pump, whatever pump you decide to run.
DO NOT just run the power thru a switch to pump unless you want to burn the thing down eventually.
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07-20-2017, 07:21 PM #13
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07-20-2017, 07:24 PM #14Xtreme Member
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Supporting Member2021 Charger Scat 392
1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot
The wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E
10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!
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07-20-2017, 07:27 PM #15
Meh, I like the big emergency switch.
But, if you wanna do it right, here ya go
http://www.leashelectronics.com/Sing...module-1HO.htm
I would fuse it closer to what the pump pulls but thats a solid relay setup.
https://www.diyautotune.com/product/...-switch-panel/
Use it for turning on relays, not powering.
Fans, fuel pump, water pump, anything else?Last edited by shownomercy; 07-20-2017 at 07:40 PM.
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07-20-2017, 11:19 PM #16Xtreme Member
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Just a way we do it in the marine industry. The groung to the pump goes to an oil pressure switch. Grounded with pressure 5 lbs. Engine dies, pump too. Its for safety. Dont want the pump still pumping if engine isnt running.
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07-21-2017, 03:16 AM #17Xtreme Member
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http://www.homedepot.com/p/Eaton-125...25V1/100557051
Cant beat this deal, even comes with switches...
Seriously, even with a 255 it shouldn't be pulling more that 30amps...Stock fuse is only 20a and is fine.
Put a nice little fuse block in
https://www.amazon.com/OLS-6-Way-Bla...y%2Bblock&th=1
Add some relays
https://www.amazon.com/dp/B071YWJ37B?psc=1
And use a panel like NoMercy posted and you'll be good.Last edited by Sahara54; 07-21-2017 at 03:35 AM.
2012 Sierra - 5.3, Summit "Stage 1" Truck Cam
1994 Jimmy - LS? LT? 4wd? AWD? Time? Money?
1994 Formula - 5.3, Terminator X, Billet VS7875, "Best Cam", T56, QP 9"
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07-21-2017, 06:42 PM #18The FABRICATOR!
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A walbro 255 at 10 psi draws 5-6 amps at 13.5v. You could actually run it off of 14 gauge wire under 18' long. Any switch rated for 10 amps is going to be fine
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07-23-2017, 07:55 PM #19The Nitrous Outlet Junkie
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Still having difficulty here. .... if I'm reading that correctly I should be able to apply 12 volts to the gray wire and that should turn the pump on .... if anybody could help me out I'd really appreciate it
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07-23-2017, 08:22 PM #20The FABRICATOR!
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That gray wire is the same as the one under the hood that's used to test the fuel pump. It is wired directly to the pump and does not run through the relay. The wire you want is the green/white one, a7 on the pcm, and apply 12v to enable the relay.
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1985 Monte Carlo SS
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Check out the M122 MCSS build thread here!
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