Stock fuel pump amperage? Can the stock wiring handle 17 amps?

Bobbystill

Bobbystill

Not-quite-so-new-guy
Mar 24, 2019
10
8
3
#1
Hey guys I'm trying to figure out if I can use any of the stock wiring to install a new in-tank fuel pump with a pump relay. The pump is a walbro gss340 which could draw up to 17 amps under full load (according to this diagram https://walbrofuelpumps.com/walbro-gss-fuel-pumps). I'm installing the pump to be used with edelbrock pro-fl 4. Edelbrock says I need to install a relay because the pro-flo ecu is only good for 10amps draw on the fuel pump circuit (Pages 4 and 17 https://edelbrock-instructions-v1.s3.amazonaws.com/edelbrock/35760.pdf). I picked up a Summit pump relay kit (PN 890023) to make this work.

I know the wiring is pretty straight forward but the really kit doesn't have enough 12ga wire to reach all the way back to the pump in my El Camino. My instinct is to buy more 12ga and terminals to go from the relay to the pump, but do any of you know if I can use the stock 12V feed for the pump that was in the car (4.3 TBI V6)? If so I could splice the relay wire in to the stock wire in under the dash and not need to run a new wire under the car. The brown/white wire below is what I'd be splicing into. Looks like 14 or 16ga. Pink wire goes to the fuel gauge.

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motorheadmike

motorheadmike

Comic Book Super Hero
Nov 18, 2009
3,520
6,737
113
Ottawa, Ontario Canada
#3
Yup. Gauge up too... your best bet is to feed the pump off the back of the alternator via the relay.
 
Bobbystill

Bobbystill

Not-quite-so-new-guy
Mar 24, 2019
10
8
3
#4
Okay thanks guys. That's what I figured was the right thing to do. The car doesn't have an engine or battery in it right now so I can't really troubleshooting electrical issues. Just trying to get things sorted out before I get the engine in the car.

Another burning question I have though is what I need for my fuel gauge to work. Does it get 12v from the ignition?
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
24,340
9,620
113
Kitchener, Ontario
#5
Okay thanks guys. That's what I figured was the right thing to do. The car doesn't have an engine or battery in it right now so I can't really troubleshooting electrical issues. Just trying to get things sorted out before I get the engine in the car.

Another burning question I have though is what I need for my fuel gauge to work. Does it get 12v from the ignition?

Your fuel gauge is an ohm reader, 12 volts just turns the gauges on
 

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