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Username Post: 1990 454SS fuel pump wiring        (Topic#356024)
Posts: 19

Reg: 10-28-02
04-15-19 12:33 PM - Post#2764279    

I have built a new engine for my 454SS. I have also used a Holley Sniper EFI. I have wired in the new fuel pump that came with the kit so that I can have the required 60psi the Sniper needs. I have left the factory fuel pump in the tank. Now that I have started the truck and everything seems fine I need to do something with the in tank factory pump. I would like to use it as a pusher pump up to the new Holley pump. I looked at the wire plug to the tank and found the gray, purple and a black with white stripe wire. I have grounded the black wire to the frame and when I connect a hot wire to the gray It doesn't turn on the pump. Any ideas?

Valued Contributor
Posts: 4191
Age: 36
Loc: wv
Reg: 08-29-12
04-16-19 09:19 AM - Post#2764336    
    In response to SCOTTCLEAVER

I used the in tank pump only for my EFI. You can get a pump out of a 96 and put it right in the sending unit and it makes 60psi.

Why do you want to use it as a pusher? Does the inline pump not work?


'88 Chevy K3500, aluminum head roller cam 511inĀ³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap

Posts: 54

Age: 33
Loc: Upstate NY
Reg: 02-03-18
04-17-19 06:06 AM - Post#2764381    
    In response to SCOTTCLEAVER

I'm as curious as Bowtie here why mess with using the stock pump when the one with the kit is able to make the pressure and works fine alone? Does it not function right? Helped friends do basically the same setup and either unhooked the wires to the stock pump leaving the level sender working or replaced the in tank pump with rubber fuel line and never had an issue. I understand the pusher pump logic to help the inline fully just not the extra work or head scratching. As for it not working stock pump may have gone bad or you lost power could be a few reasons my opinion check for power in the harness and go from there.

If it's to loud your to old

93 K1500 Z71 step side ext/cab 5.7 shorty headers and 3in true duals. 3in body lift and leveling kit.

89 K1500 4.3 rotted frame dubbed parts rig Sold

Posts: 19

Reg: 10-28-02
04-17-19 03:14 PM - Post#2764412    
    In response to Skribble93

Thanks for all the help. As in 99% of the time its a broken or bad ground wire. The sending unit/fuel pump plug was fine. The single seperate black ground wire was broken. It works fine now. The reason I wanted to activate the tank pump was my thinking that the Holley electric pump was overworking as it tried to pull fuel through the pick up and then the factory pump before it ever got to the new pump. My reasoning left me with two options. I would have to take the bed off to pull the old pump out of the tank and out of the way or activate it. Of course I thought my lazy way may be beneficial to the new pump because the tank pump would be doing some of the work. On to my next 29 year old truck problem. Thanks for the help. Scott

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