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Fuel pump location

Old May 4, 2003 | 09:45 PM
  #1  
JP84Z430HP's Avatar
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From: Johnstown, Ohio
Car: 84 Z28
Engine: 355 (fastburn heads, LT4 HOT cam)
Transmission: 700R4
Axle/Gears: 9-bolt, 3.27
Fuel pump location

I don't know if this has been discussed here or not, but where is the best place to mount an external electric fuel pump?

Why do I ask, I have mine in the engine compartment, and I think that may be why I "run out of gas" when I open it up. The fuel pump is the Carter P4070. It has a green label. I also know that it will most likely not be enough pump when I get my engine running up near it's potential, but by that time, I should be fuel injected anyway. I have exhaust flow issues (Manifolds and stock pipes), and other stuff I need to get some money to address before worrying about the pump not being enough. Right now the "Butt Dyno" say around 225-240 HP.

My theory: The electric pump doesn't provide enough suction to keep the fuel coming all the way from the back when under high demand.

Does this theory hold any water? (Or gas? ) I would like to hear some opinions/experiences before going throught the trouble to put holes in the underside of the car, and run the wirinig all the way to the back. This is a somewhat temporary setup, as I will be going with fuel injection sometime within the next year, and I'm trying not to put too much work into something temporary!

Thanks in advance for any help I receive!
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Old May 5, 2003 | 11:25 PM
  #2  
JP84Z430HP's Avatar
Thread Starter
Supreme Member
25 Year Member
 
Joined: Feb 2000
Posts: 1,416
Likes: 0
From: Johnstown, Ohio
Car: 84 Z28
Engine: 355 (fastburn heads, LT4 HOT cam)
Transmission: 700R4
Axle/Gears: 9-bolt, 3.27
I'm only gonna bump this once and leave it at! I hate it when I see a post full of pointless bumps! 1 is all I give it!

Unless I get some info from someone, I'll go ahead and move the pump to the back next chance I get, then post the results! IIRC, the directions with the pump did say something about keeping the pump close to the tank. I'm just worrried about having it mounted to the body right below the passenger compartment. I don't wanna hear it running!
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Old May 6, 2003 | 07:10 AM
  #3  
kevinc's Avatar
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Joined: May 2000
Posts: 2,963
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Car: 1982 Z28
Engine: LS1
Transmission: T56
Electric pumps have trouble pulling fuel as you described, so keeping it near the tank is the way to go. We fought this on my neighbor's old Nova, his carb bowls were running dry at WOT after a few seconds. We finally moved the pump back to the rear frame rail near the tank and all was well.
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